Ls2 compression ratio. of torque, with a high, 10.

Ls2 compression ratio 0007-4. - ft. More potent than the LS2; Higher compression ratio; Used in a variety of GM vehicles; Cons Nov 16, 2010 · LS1/LS2 Engine Tech Max compression for E-85 NA? Only if you run domed pistons would you need to increase the cc volume to make the target compression ratio. 39 Regular Price $655. Casting Numbers: 12568952, 12560799. The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). Jul 16, 2010 · C6 Forced Induction/Nitrous - LS2 or LS3 for boost? - I'm looking to buy a corvette which I would supercharge, and I am trying to decide if I want an LS2 or LS3. 7 psi. Chamber = 64. Wanting to rebuild another 6. 5:1 so that is 169 2005 Pontiac GTO LS2, 600 HP - In Garage 1999 540IA - In Garage _____ 2004 Pontiac GTO, Tuned LS1 Jul 14, 2008 · You're going to need the exact static compression ratio figure for the the first one for finding your true dynamic compression ratio. 0L, aluminum small block engine. Stroke: 3. 9:1, and added the LS6’s 243 heads (albeit without the sodium-filled valves) to crank output to 400 horsepower and 400 pound-feet. p. With a 4. 27cc = 9. 5 CPR, LS2 Timing Chain Formato Tuned - 675 whp Aug 16, 2023 · The LS3 engine is a small block V8 that was introduced in 2008. Compression Ratio. Due to changes in piston design, the LS2 also had a higher compression ratio than the LS1. 5:1 DCR, 60cc chamber TR6 plugs gapped to . Heat range 5 seems to me too hot. Cam: Thunder Racing custom hydraulic roller, secret specs. The LQ4 has dished pistons and runs lower CR. 240 in Apr 30, 2005 · It goes into the new 2005 Corvette, as well as the '05 Pontiac GTO and Chevy SSR. Gonna be running over 20 psi ~ 800-900 wheel. if a guy comes in my shop wanting 650 HP on a stock block, i tell him he is on thin ice. Dec 1, 2009 · LS2. 8:1. of torque, with a high, 10. 9 to 1, and the stock LS2 cam closes the intake valve (0. 1 to 1). If to convert the 6. Apr 20, 2024 · The LC8 version of the Vortec 6. 9:1. Also the rods are not as good in the LQ4 either. i. 051" Apr 20, 2024 · The naturally aspirated LS2 produced 400 horsepower and 400 lb-ft of torque with a 10. Aug 3, 2008 · Our 243 heads after being ported for an LS2 have a chamber volume of 61. 0-liter displacement to cubic inches, we will get 364 cu in. 5:1 compression. Jan 9, 2015 · These offer improved flow over the early cathedral port LS1/LS2 heads. 58-59. 100-1. I will be doing those mods myself soon prc ls2 heads with 72cc chambers. Types of Compression ratio. 240 deck ht. 8 and up on the compression. 9 to 1 is correct. m: 430-436 hp at 5900 r. 3 CR 70. 065 inch bore Pin Dia. 030 to get the compression closer 9. 64. EDITED, Jun 29, 2023 · Back up a little and give us the history on this LS2. 8/5. Upon searching I have found that there is an abundance of sources on the 10. 4:1: Horsepower Rating: 362 hp: Torque Rating: 391 ft. My bore was machined to 4. 7L displacement LS1 graphite head gaskets installed. 335, 4. 040 gaskets yield a 11. 0L / 364 c. Oct 28, 2013 · Advanced Induction 241 219cc High Compression 11:1 SCR / 8. Compression ratio in the LS3 is 10. 02€mm 0. Deck Height Jan 27, 2007 · LS1/LS2 Engine Tech Ls1 To Ls6 Compression? Jump to Latest 7. Feb 13, 2021 · using the PCM of NC spreadsheet, with a . way to high of compression for alot of boost, BUT you can run 8-9- psi all day and with meth you can do it and the motor wont hate you so much. 9:1, higher lift cam, 15% better intake flow, and 20% better exhaust flow. 7 cc dish / 4. GM calls the architecture for the LS2 (and its truck-oriented Vortec variants) the Gen IV small-block. 905 Bore 4. Compression ratio is 10. For example 13 to 1. True? If so, how much? True, The L92 heads need to be milled . 06cc for 317 or 64. 0L truck engines use the same combustion chamber. Wiseco Pistons LS2, Compression Height 1. Oct 2, 2017 · Compression Ratio of Various Combos LQ4: 9. The LY6 (along with the LC8, L76 and L96) came with high-flowing LS3-type rectangle port heads. 61:1. Max Sep 13, 2009 · LQ9 and LS2 are same motors minus the heads. Kit Fits GEN III 6. 575 Valves Walbro 255 l RPO LS2 l VIN H l Bore 101. 622€in l Compression Ratio 10. 4:1, as the pistons have valve reliefs machined in the top halves of the pieces. 9:1 compression, and the same heads and cam that came in The High-torque, gear-reduction design GM LS Starter has a 12V, 2. The compression ratio of the L99 motor is 10. 383 Stroker LS1 3. 5 with 8 PSi of boost you will have a 13. 5 CR 69. I. Feb 26, 2017 · Alot of things go into how much power, whats done to the heads, what compression ratio, what pistons etc plus who is tuning it can be a huge differance. Specifications Jan 4, 2018 · The camshaft of the L99 engine has slightly less duration than the one found in the LS3, giving the Camaro SS paired with this motor a smoother ride. It is compared to what static compression ratio would have to be to get the same compression pressure. Jul 26, 2012 · Any aftermarket cam is going to have considerably more overlap and will allow for higher static compression ratios. 2 - LS3 - L98 - LQ9 - LS7 - LSA - LSX Chevy LS FX Series -22cc Dish Top LS1,LS2,LS3 and LS7 Forged Piston Set 4. Joined Jun 15, 2003 May 23, 2019 · Put it into a compression calculator and find out? Compression Ratio Calculator - Wallace Racing 3. 9:1: Valvetrain: Jun 5, 2016 · In general terms, forced-induction engines are safer with compression ratios in the neighborhood of 8. /lbs. Jun 8, 2021 · To demonstrate piston selection based on stroke, bore diameter, rod length, piston compression height, and cylinder head combustion chamber volume, following are examples of LS7 flattop pistons that feature a dome volume of –2 cc. 711" dynamic stroke for a dynamic compression ratio of 8. 0 - LS2 -6. And with piston design changes that bring a higher compression ratio, the LS2 edges past the LS1 again. Cylinder Head Design: the LS2 cylinder heads are almost identical to what was used on the LS6 engine, right down the “243” stamp in the castings. 74:1 243/799(ls6/ls2/l33) casting: 64cc 823/821 (ls3/l92/ly6) casting: 68cc 862/706 (5. 0L, Gen. 45 CC head (P/P'd 243's)-2cc Diamond Pistons Piston deck height of -. 662, Rod Length 6. 0 liter motor is about 11. 9:1 compression? - I'm curious as to how GM came to 10. Feb 15, 2005 · Compression Ratio = 12. 9:1 Jul 31, 2020 · The Gen III have 862/706 Gen III heads, and the Gen IV have 243/799 heads. with Sep 20, 2023 · LS2: LS3: 400 hp at 6000 r. Aug 3, 2008 · C6 Tech/Performance - Increased Compression Ratio - LS2 - I am interested in increasing the compression ratio on my LS2 from stock (10. 9:1 Alternator: 50 Amps (idle), 120 Amps Maximum Cylinder Head Material: Cast Aluminum Cylinder Block Material: Aug 15, 2012 · Looking for the stock compression pressure on an LS2. / 0. Compared to Gen III engines, LS2 keeps a bigger bore of 4. 11. Jun 5, 2023 · I thought I stepped back in time 10 years ago with all this dynamic compression ratio talk. 125 rods is 1. 9:1 compression LS2 tuning! Nov 1, 2009 · The 6. $757. 040" Custom 4" ram-air intake and 4" SLP MAF with resistor removed, ported/polished TB 1 3/4'' Longtubes 2. 59cc = 9. No idea why you youd go that wild with cam when you have what should be a very good cylinder head on it and hope you have an even better intake manifold on it. 7:1 being already down slightly from the LS2's 10. Feb 12, 2008 · The use of a smaller chamber (64cc versus 71) hikes the LS2 compression ratio to 10. 0 ls2 bare block for $650 from Steve, Nov 21, 2023 · Compatible with LS1, LS2, LS3, LS6, and LS7 style intake manifolds which raises the static compression ratio by approximately 0. 74cc = 9. it goes by COMP ratio to PSI of boost. All 2014+ direct injected vehicles. 5 to one would be best unless you are really going to shove a lot of boost through there. Note: “CD” stands for piston compression distance and “CR” stands for compression ratio. I was always under the impression it was 8-9. 0 w/ 289K. 004" off the seat), but this site claims that theta for the LS2 is 81*. The recomended ratio for the cam i want is 9. Oct 18, 2018 · The L76—like its LS2 sibling—is a 6. 7 comp ratio. 9:1), a higher-lift cam (with higher-rate valve springs), and a 15 to 20 percent improvement in the intake and exhaust flows. / 427 CID Bore x Stroke = Compression Ratio = 11. 9:1 and with the 72cc chambers and cometic . 0:1 air/fuel ratios on fuel injected F. : 0. -ft. The LS2 had improved “breathing” for both intake and exhaust manifolds, the engine had better cam lift, and it had a higher compression ratio (10. It would also lower LS2's compression ratio, so taking this avenue would work better in a boosted setup. The result of this is called effective compression. Compared with the LS1, the LS2 engine has a higher compression ratio at 10. LS2 Ported Heads 2. 00 inches with a stroke of 3. 060). 000 in. @ 4,400 RPM (Coupe, Convertible LS2) 470 lbs. 500-inch stroke, these -28-cc pistons still squeeze out 10. the stock LS base motors are 10. Oct 31, 2011 · The cam will make a big difference. 967 L)/364. Using a . Your 11. The LS3 was used in various GM vehicles, including the Corvette, Camaro, and Pontiac G8. 030 " mill) and some approximate #'s i got for a the late model ls6 cam duration of the internet, since the intake duration is roughly the same as the LS2 cam, using the 116 LSA of the LS2 cam, i get roughly . VIN 8th Digit Year What is a L77 motor LS2,Ls3 etc? Reply Sep 5, 2021 · Engine: Type: 6. 6:1. 9 vs. LSx, LS1, LS2 LS7 GM Performance & Technical Information The compression of the LS2 was also raised to 10. 0 but use 862 heads to bump up the compression, but, if at all possible not be relegated to using 92 octane. 2KW motor and a torque ratio of 15:1. 6:1 compression that makes 300-325 hp. A dished piston was used with lower compression LQ4 engines while higher compression LQ9 employed a flat top. 2006 LM7 5. 0017€in l Stroke 92. 63€mm 2. 3 with 243/799 compression ratio? - I know this has most likely been discussed but couldn't find a definite answer with the google machine. 052 head gasket and assuming an out of bore piston at roughly . Is static CR is the only factor? A cammed car may have a higher dynamic compression ratio, wouldn't that effect the decision on what plug to use? Aug 9, 2010 · I remember reading about the L92 and LS3 a couple of years back and my personal theory was that the slight difference in compression ratio between them (the LS3's 10. There's absolutely no way to ascertain the engine's static compression ratio by a compression test. Ended up milling my heads 0. 910 Head gasket bore. Later Gen IV supercharged engines like the LSA and LS9 use dished pistons to reduce the static compression ratio. 41:1 - milled . 6:1 compression ratio. 008 (Supposed stock) the Cometic . 9. 345-2. com Email tuning!!!, Mail order, Dyno tuning, Performance Parts, Electric Fan Kits, 4l80e swap harnesses, 6l80 -> 4l80e conversion harnesses, Installs Every engine has a particular compression ratio. Mar 21, 2005 · The LS2's 10. 6:1 according to the build sheets. 25:1 compression ratio. Mar 1, 2008 · GM LS2. 9 to 1 versus 10. 9-1 cr Oct 30, 2017 · Generation III Internal Engine - Gen 3 5. Material: Aluminum. 25:1 and the LS6s' 10. 5cc Gasket Height = . Forged and Machined. With Jan 19, 2021 · For the LS2, GM enlarged the engine to the 6. 000" head gasket bore / and either 71. 0 engine is designed to run on either gasoline, liquified petroleum gas (LPG), and compressed natural gas (CNG) fuels. 066 head gaskets it will get the ls2 to almost ideal boost compression I don't Remember the exact math I had done but with 72cc chambers on stock bottom end it would drop it to ~9. L77 Applications. LIMITATIONS: This is ONLY for stock LS2 engines with stock pistons protruding an assumed 0. Dec 6, 2007 · What was a good compression ratio to run on a DD LS2 402. 052" thick, and that GM's published static compression ratio of 10. 0:1 CR and similar hp/liter ratio as mine GTO, for example. There are cars running 12:1 C/R using 87 R+M/2 (standard grade) here in the States. Trusted By Champions. Nov 19, 2008 · My 383 build is well under way, but before the cam gets ordered and other work is planned, I need to decide on the desired compression ratio. 9 Compression Ratio) is at the ragged edge of what Pump Gas can support when the car as at lower elevations (think Florida vs Denver). Our motors don't see their advertised compression ratio even with a stock cam. Compression ratio: 11. 7:1, and the LC8 uses an iron block and aluminum head. Jul 29, 2007 · I've read that the L92 head needs to be milled to retain stock LS2 SCR (Static Compression Ratio) of 10. 315". Is that right? On the LS2 9. 9:1 . Rocker Mar 21, 2006 · All motors have a static compression ratio. 3 with 243 is 9. 9:1 ratio but I am trying to find out an acceptable range of pressures for each cylinder when doing a compression test. Nov 1, 2008 · Compression ratio was dropped in order to come up with a boost-friendly setup, and a custom roller cam was spec'd with boost in mind. Before a head gasket change I was at 11. 051 in Bore = 4. 5 range for Tier 1 93-octane gasoline. 045 head gasket then the compression ratio is about 11. The LS2 with its smaller chambers and more aggressive cam makes 400 hp. Sep 3, 2023 · C6 Corvette General Discussion - EZ 21 HP increase for my LS2 powered C6. Jul 7, 2023 · The LS1 featured a compression ratio of 10. Most of these vehicles will have a note in the owners manual as well as a decal on the gas door stating a recommendation to that effect. 0-liter LS2 and L76 aluminum engine (SSR, Trailblazer, CTS, and Corvette) or the 7-liter aluminum engine is about 100 pounds lighter, but it will be a lot more expensive and harder to find Mar 19, 2020 · The static compression ratio (sometimes called the mechanical compression ratio) is a handy reference that engine builders use to build and describe engines, but no two engines with the same CR Aug 6, 2020 · Hey all I have an lq4 I want to swap into my obs but I want to get some 243 heads milled to 62cc with I was told maybe a . 008" out the hole / 0. 99 400 lbs. The compression ratio is calculated in the following two different methods: Static compression ratio; Dynamic compression ratio; 1) Static May 1, 2009 · LS2-equipped GTOs are prime candidates for an L92/LS3 head and cam package, since the stock bore size is 4. 347€in Jan 9, 2011 · The 10-10. 0 L. The chances of your engine's compression ratio being the problem are slim and none. 00" / 6. 3L I understand one must be mindful of the piston rings' location relative to the "scalloped" areas. 5 compression LS1, LS2 & LS6 I feel comfortable with 11-13 PSI on forged pistons and 9-10 PSI with stock pistons. 020 already what will my compression ratio be? Dec 7, 2017 · The LS2 is a Gen. 2. The compression ratio is 9. Oct 19, 2006 · I can't remember the compression numbers of the LS2 but I think they are on the pontiac site, or the GM crate motor site. 240 block height, the piston would stick out of the block . 7:1, and even the original LS1 engine had a 10. GM would increase this once again for the LS2 – which had the highest to date with 10. Heads: TEA LS6, Comp cams 921 valve springs. There was a compression ratio calculator on the web some time ago which allowed you to fill in the different values for bore, stroke, cc size, and piston relief and the width of the Feb 1, 2018 · I have a 99 silverado 2500 2wd with 6. Based on all of my research I'v gathered the following numbers on my engine. 0:1 Jul 14, 2010 · The compression ratio will depend on the specific combustion chamber size your cylinder heads, any change in volume the piston top surface may or may provide. 5" dual exhaust w/ flo-monster X- pipe. For maximum reliability you usually try to select a spring which at full compression is just under the coil bind distance limit (usually something like . Produced: 2008–2013 Found in: Corvette, Pontiac G8, VE, HSV, Camaro SS Power: 317–325kW Torque: 570–580Nm. 400 hp @ 5,200 RPM (Coupe, Convertible LS2) Torque: 400 lbs. An engine with an absurdly high compression ratio will idle just fine on reg gas. If you’re interested to know more about how the LS1 compares to the LS2, we recommend checking out our LS1 vs LS2 guide. Mar 24, 2012 · So, I'm doing all the math to plan out a build in the future for my ls2. 3:1; Compression Ratio LSx, LS1, LS2 LS7 GM Performance & Technical Information The LS2 is an outstanding continuation of GM's high-tech, pushrod small-block V-8s. Moreover, the compression index was raised to 10. Jun 8, 2009 · It has V8 5. 0 coming online soon. 0cc, . a 72 cc vs 64. F-body T-56 RAM lightweight aluminum flywheel LS7 clutch Factory Mazda Diff LSD, 4. 5:1 Specifications Mar 24, 2013 · The compression ratio is only a part of the equation. eljefino. 0L truck engines came with cathedral-port heads. Dec 1, 2022 · As torque number equaled peak torque, LS2 achieved 400 rpm lower, contributing to a better feeling of the motor. 0-liter displacement previously used by the Generation III LS truck engines (see below), bumped the compression ratio to 10. I don't have an LS2 block handy, would this be a viable solution to mounting 4 1/8" bore heads on a 4" bore block? Oct 2, 2003 · Dynamic Compression Ratio This is the real compression ratio as the engine is running. Apr 27, 2008 · On a semi related note, the LS3's compression ratio is rated slightly lower at 10. The LS2 engine utilizes a cam-in-block configuration with overhead valves and a pushrod valvetrain. 10 ratio Aug 13, 2023 · Was GM pushing the envelope a bit much with an LS2 compression ratio of 10. Are the rocker arms offset like the LS7? Feb 4, 2011 · Yes an no they are the same bore and stroke but have some difference. 9 : 1: Horsepower Rating: LS1/LS6 and Vortec Truck Engines as well as Gen IV (58x) LS2, LS3, LS7, & Vortec and GEN V LT / ECOTEC3 Engines MAHLE Pistons Forged Aluminum Power Pack Ring & Piston Set LS1 LS6 LS2 Part Number: MAH-930218010. There are lots of maggies on LS2 GTOs, and I've never heard of anyone tanking their engine after installing one. This PROFORM Starter is 100% NEW, not rebuilt with remanufactured parts! Offset design results in more clearance between the oil pan and the starter, and can be rotated for additional chassis clearance. The LS3’s compression ratio is 10. whats the best way to change the compression ratio. 25:1. Most 6. 2-LS3-L98-LQ4-LQ9-LY6 OEM Stroke 3. 5:1 JE Pistons, Forged, Forged Rotating Assembly Kit, Shop Every Part for Power Onlin Compression Ratio with 70cc head 10. Oct 31, 2011 · And what cam or dynamic compression ratio are you at? I know some ls2/ls3 vettes run 10. 000 in Stroke = 3. 945 Wrist Pin, Set of 8 Pistons Special Price $590. 0 LS2 V8: Block Materials: Cast Aluminum: Displacement: 6. On Thousands Of Builds. May 27, 2012 · C6 Forced Induction/Nitrous - LS2 370/F1R Compression Ratio? - Hey Guys. 7L V8 had a compression ratio of 10. 4, 6. 7 and oddly enough the almost identical L92 in the Cadillac Escalade is somehow rated at only 10. Tuning for it is easy enough. 03cc = 9. This also assumes that the stock compressed GM head gasket is 0. With modern engine computers, knock sensors and per-cyl ignition retard, it isnt as hard to run high compression with fewer problems since the computer can dynamicly 'tweak' timing and fuel needs to compensate. It is a 6. 2K When i put my LS6 head's on my LS1 what will my compression ratio be at? I know stock i'm at 10. Mar 11, 2015 · With stock heads compression is around 10. And finally, the LS2 (used in the Trailblazer SS) uses a 10. 4:1. 0€mm 3. It just won't take a load. The engine I am having spec'd now is 11. Dec 29, 2009 · Additionally cam design and net Dynamic compression ratio will also have a marked impact on the final tune. 790 CR Jun 7, 2005 · There is a good bit of difference in Compression Ratio though. Sep 5, 2014 · We take a look at the first GEN IV GM engine, the LS2 and show you a complete breakdown of LS2 Specifications, perfect for engine rebuilds or service. @ 4,800 RPM RedLine = 7,000 RPM Mar 3, 2017 · In order to achieve the higher horsepower output, the LS2 engine featured a higher compression ratio (10. 7 (or whatever everybody else said they ran) is only a theoretical compression ratio and not what is actually obtained due to valve events. Compression ratio is simply too high to efficiently burn 87 octane. 0-liter engine that features an aluminum block and cylinder heads, which contribute to its lightweight design. LS3 Engine History Jun 28, 2018 · Compression Ratio: 10. 9:1 static, 8. 2:1 compression. 622 in Deck Height = 9. shave heads or new head gaskets Unless the stock compression ratio is increased or you are running NOS I don't see any plug working better than the original A/C delco's in an LS2. , maybe in the 11. Jun 19, 2018 · PD blowers make predictable boost. 5 point on otherwise stock 5. There were several other changes between the LS2’s Gen IV block design, and the Gen III block design of the LS1. 622" Compression Ratio: Made In The USA. 5:1 ratio. Jan 9, 2009 · here is what you can do and what we go off of. Bore Dia. You have to remember that because of valve overlap the static compression number is not all that meaningful; dynamic compression is what the engine is really seeing. Major differences include a higher compression ratio and a slightly larger cam, which boosts Sep 23, 2022 · While it might only seem like a small difference, the increase in bore diameter multiplied by 8 results in 0. 86:1 l Firing Order 1-8-7-2-6-5-4-3 l Spark Plug Gap 1. Tuner at PCMofnc. 62 inches: Compression Ratio: 10. I would say that keeping it to at least a static compression of 9. No need to worry about your compression ratio if you install a supercharger kit designed for our engines. 0L Vortec 6000, LQ4 LQ9, GEN IV 6. 4, aluminum small block engine that was used both in GM cars and trucks. I have a engines book and it has a chart in it. 165/1. 200- inch bore and a 4. 5 degrees ABDC, yielding a 2. LS1 is 10:1, LS2 is 10. 2L truck/SUV engines have a 10. Jul 7, 2014 · compression ratio, but I will be running it on straight E85. 9:1 compared to the LS1s' 10. The density of the charge filling the cylinder will determine the dynamic compression. The engine specs and information listed here is for the stock LS2 used in GM passenger cars from 2005-2007. 011" and raise the factory compression from 10. Im in the process of doing a forged ls2 370/f1r build but i have a few questions. b. Pushrods: Thunder Racing heat treated chrome-moly. 402ci LS2. 9:1) was just a 'ratings' number, that they were actually identical short blocks, but that was just me. 9:1? This is great stuff! SOLID info and helps me greatly to be more confident in some of the conclusions I am arriving at about wide open throttle 118k (excellent condition) 10. 9:1 compression on the LS2. 618-101. 9:1 is quite high for a stock compression ratio. 9! So, the LQ4 makes the least power (300 to 325 hp depending on RPO). 065 in. 2L / 376 c. 3 with dished pistons, if I slap on a set of 799's that are milled . 33" Regular price from $669. Deck Height Sep 27, 2012 · I took a look at the autotec pistons, and on they're website it says that the Compression height of the piston or piston height for the 6. 5:1 dynamic, with 10-11 psi boost, 550+ rwhp factory Jul 6, 2012 · If I were to get the ls3 heads and run boost down the road, I would think to not mill the heads so I would drop the compression ratio down a bitAny thoughts? LEP Tune, Gutted Cats, Resonator Delete, Pypes M80 muffler, Billet 2-4 Servo, Trans Cooler, TR6 Plugs, Massive Wires, K&N CAI, Rear bags dropped, KW Coilovers, Rear emblem delete, 1 Sep 20, 2008 · With a higher compression ratio, 18 more cubic-inches, induction/intake and exhaust flow better than 2002 to 2004 LS6 engines and various internal modifications that decreased friction and pumping losses, LS2 should have been rated at the 406 or 407 SAE net horsepower that Tony Holloway told me LS2 engines produce. 3 with 241 is 8. Compression ratio: 9. Using a calculator program I got intake closes 68. What compression ratio should i go with? Im hoping for 900+rwhp pushing 20+ lbs of boost with Methanol. 9:1 compression ratio and a 6500-rpm redline. 99 Compression Ratio @ 66cc: 10. It's rated at 400 horsepower and 400 lb. 0:1. 5. 0L LS2 L76 L98 L77 LY6 L96 Compression Ratio with 65cc head 11. 1 sme as 4. 576" 113+2. 5:1 so I am sure I would need to change to different pistons, cam, and carb as well. Feb 18, 2005 · Head CC volume vs Compression Ratio: _____ The below CR numbers are with the stock GM 5. 45 to 1. The LQ9, with its higher compression and slightly different tune makes 345 hp. Engine Block Specifications. 1 cu/in Nov 26, 2022 · Comparatively, the LS2 was rated higher for 395-400 horsepower and 390-400 lb-ft of torque. Apr 12, 2018 · You also get the sturdy 4 th-gen full-floating connecting rods and a boost-friendly 9. I've run into a wall while I'm calculating the compression ratio for my stock engine. Prochargers also work on the stock LS2. 7 x 13 = 191. I know the LS3 is a little bigger and badder, but it runs a bit higher compression ratio (10. 1:1 Horsepower = 500 HP @ 6,200 RPM Torque = 475 #-Ft. 103" intake valve drop (which assumes a . Also the LS2 has 243 heads with higher CR. 4:1 Dome Wiseco Pistons, Compression Ratio with 70cc heads 11. 1 Mar 23, 2012 · C6 Tech/Performance LS2, LS3, LS7, LS9 Corvette The intake valve closing point and static compression ratio are the main determinates of cranking compression Molnar Balanced 392 LS2 Stroker, 10. CleviteKid's spreadsheet says theta for the LS2 cam is 68* ABDC (the point where the intake valve has closed to . 055", but the newer replacement LS2/LS3 head gaskets are 0. A 13:1 compression ratio should thus give you 14. The M3 BMW runs around 11:1 compression, and the most boost it could run is 5. 098 rod length / 9. The L76 was available in the Pontiac G8 GT from 2007-09. Hello guys, As my title says have a boosted ls2 6. Boost and detonation is really, really bad, and that is common when you raise compression. @ 4,800 RPM (Z06 LS7) Fuel Induction System: Sequential Fuel Injection Fuel Requirement - Coupe, Convertible: Premium Recommended Fuel Requirement - Z06: Premium Required Redline (RPM): 6,500 Compression Ratio - Coupe, Convertible: 10. 7:1. Pros. 1:1. I watched last wkend they did the fi tech fuel injection and on a 350 it bumped it up about 30-40hp. 2 CR 71. It is a ratio of the cylinder volume at BDC to the volume at TDC. 95 Buy Molnar LS2 402-408 Stroker Balanced Rotating Assembly with 11. 0 as is the L76-equipped G8. 5 u would have a 14. Jun 2, 2017 · Simply increasing the bore and stroke of a motor—while leaving the piston compression height, deck clearance, and piston dish volume the same—can dramatically increase the static compression ratio. 9:1, over the LS6’s 10. 0L (5. 045 gasket. 636€mm 4. 89 inches, the LS2 pulls ahead with more significant displacement. A few years ago I did an LSA build and kept my compression at 9. 0 but i think thats the limit you. If the ambient pressure is 1 atmosphere then it is 14. 6 Engine Block Specifications. It was also used in some Australian Holden cars. 4. 3 with 317 is 8. m: Cheaper: Expensive than LS2: Cathedral intake port style: Rectangular intake port style: Compression ratio Feb 19, 2024 · The Chevy LS2 engine is a V8 engine that belongs to the Gen IV small-block engine family. GM/Chevy advertised compression on the LS1 as 10. 62 inches. 6:1 static. I want to run a 227/234 btr cam with 614"/. 50 Think the original LS2 head gaskets had a compressed thickness of 0. That makes a fairly huge difference in stock LS2 DCR (7 1/2 vs 8 1/2). 5 psi with an intercooler, and made only 80 rwhp and 35 rwtq. 5 cc with a . When a supercharger is added, additional air is forced into the cylinder effectively raising the compression ratio. Namely the pistons and compression ratio. Compared with gasoline, both the LPG and CNG versions make less horsepower and torque. 5:1 compression ratio and as a result, require premium. Compression Ratio: 10. 4 CR 70. Springs, Retainers), Zl1 Lid, Ported Stock Heads w/ 9. Jan 2, 2010 · With enough cam duration you can run 12:1 and higher. 622 in. I understand that even with the higher static compression that the cylinder pressure can be managed by cam timing and bleeding off some of the pressure. 54:1, picked up 6. Installing the thicker 2003 GM MLS head gaskets will decrease your compression ratio by approx 0. 8:1 compression in a 500-ci LS2. Dec 5, 2011 · just want to no what the sandard compression ratio on my vu ss is standard heads and gaskets. 3L more displacement. 5-1. Turbos are another story. Displacement: 6. 943" Comp Height: 1. My current engine is 10. 1 CR 71. 005” to accommodate pistons that were in stock at the time, compression ratio 10. If you were to run a . Mar 30, 2017 · Because production LS engines have relatively high compression ratios, extreme care must be taken to avoid detonation with superchargers and turbo systems. Heads: AFR 225 Jul 4, 2019 · Thats a ass ton of cam and it would want more compression, but it will be okish. 0-LS2-6. 4 i used to know the formula off top of my head. 71cc = 9. The attached chart (click on it to see it full size, I doubt you can read the thumbnail ) shows that the stock DCR is 8. Both have the same 65cc combustion chambers and Jun 22, 2020 · The LS2 also featured an increased compression ratio of 10. 8 same as 4. Oct 25, 2008 · The stock static compression ratio for the stock LS2 is 10. 7 so 10. Jan 29, 2021 · Im at a static compression ratio of 9. Dec 30, 2017 · Here are my numbers if someone could tell me if they are correct or too high or what are the correct psi reading for stock ls2 motors that would be great! #1=245 #2=250 Texas Speed & Performance 101 Velocity Drive, Ste 100 Georgetown, TX 78628 Apr 3, 2010 · Pulled out my cam card while in the shop today. Bolt-on kits can be tuned to minimize the risk, but lower compression pistons should be used when building an engine for greater power and higher boost levels. I was curious what the highest compression ratio I could get away with would be on a pump gas street car. 4 to 11. Hope this helps. 1 - 0. 2 72. d. Performance Mar 2, 2006 · With a higher ratio rocker arm the springs have greater compression length and unless you increase their installed height they may coil bind. 45cc for 243's. The LQ4 comes with 317 heads and a truck intake. 5 on a LQ9 and you get same SCR as LS2 just like a 4. The beginning of the video with the specs sounds like a pretty nice motor combo. 000 Bore, Stroke 3. 0 or 9. Dec 11, 2010 · Static Compression Ratio 11. May 27, 2016 · The S54B32 has a compression ratio of 11. It offers the superior architecture of the LS family of engines, free-breathing heads right off of the LS6 Mar 30, 2017 · In general terms, forced-induction engines are safer with compression ratios in the neighborhood of 8. 0 Litre/364 Cubic Inches: Bore: 4 x 3. The 862/706 heads have smaller combustion chambers than the Gen IV, raising the compression ratio when swapped directly. LS2 engines are 10. 006" off the seat) at 68 degrees ABDC. It changes with rpm, load, throttle position and temperature. Probably will not go Jan 23, 2007 · The Magnacharger is designed and warranted to work with the stock LS2 compression. co Dec 21, 2017 · Compression Ratio: 10. I have no problem running premium gas. Valves. LS2 Oct 29, 2008 · questions, I'm posting a STATIC compression ratio chart. 62-inch stroke), 10. It is an evolution of the LS2 engine, with a higher compression ratio and more power. 3 lm4 Dec 10, 2024 · What sets the LS2 apart from the LS1 is its increased bore diameter; at 4. 9 to 11. @ 4,400 RPM Fuel Induction System: Sequential Fuel Injection Fuel Requirement: 93 Octane Redline (RPM): 6,500 Compression Ratio: 10. Without knowing the specs, 12:1 should be perfectly safe. 9:1 compression ratio and a 6,500 rpm redline in the 2005 Corvette C6. 006" above the block deck. 006" the compression ratio on a 6. May 1, 2006 · Also available from GM Performance Parts as a crate engine, the LS2 ships with 364 cubic inches (4-inch bore with a 3. Jun 5, 2024 · Compression ratios are fundamental to enhancing engine performance, understanding both static and dynamic compression ratios can give you an edge in fine-tuning your vehicle's performance using HP Tuners products. 94:1 and a dynamic compression ratio of 8. This will be a max effort ls2 370 build. Oct 30, 2006 · The old LQ4 that's in the GMT800 heavy duty models, the H2, and the current G-vans is a Gen III, cast-iron block with 9. 590-in Sep 27, 2011 · They try to make the power with more aggressive ignition timing advance curves while using relatively rich air/fuel ratios, but he has found in his experience tuning forced induction engines since 1994 that running even as lean as 13. Reply 0 May 6, 2010 · C6 Tech/Performance - LS2 10. the cam is ground with a 110 intake centerline and 277 advertised duration. 1 psi at sea level a d standard pressure. 5:1 to 9. And every books states the same - knowledge based on motorsport history. 622" x 4. 56:1. I know of one pump gas LS2 running 12:1 compression with a big cam. 5:1, but LS engines have much greater “squeeze” from the pistons. 098, Dome 4. Amazingly, I couldn't find any threads about this. See full list on tuningpro. The compression ratio of the petrol engine typically falls between 10:1 and 14:1, whereas the compression ratio of the diesel engine typically falls between 18:1 and 23:1. 2834-4065 6. Deck Height Aug 10, 2014 · I have a well built 496 BBC and I am wanting to bolt up a procharger to it. The LS7 engine of the Corvette Z06 has 11:1 compression, the LS3 is at 10. 5:1. 04€in Block l Camshaft Bearing Bore 1 and 5 Diameter 59. 05cc = 9. 030 to maintain stock LS2 static compression. 2. LS2 heads are the same 64cc chamber'd heads on the LS6, but the LS6 has a 10. 9:1: Horsepower Rating: 390-395 hp: Torque Rating: 400 ft. 020" = 9. 9 to 1) by some amount t. Comb. (This surprised me!) VID - I believe the LS2 (with it's 10. these numbers been proven over and over and over again. 00 inches compared to the LS1’s 3. . To get the readings you are claiming, you would need an approx 15:1 compression ratio. With a higher compression ratio, 18 more cubic-inches, induction/intake and exhaust flow better than 2002 to 2004 LS6 engines and various internal modifications that decreased friction and pumping losses, LS2 should have been rated at the 406 or 407 SAE net horsepower that Tony Holloway told me LS2 engines produce. The LS2 in the E-series HSVs are modified in Australia to produce 412 bhp (307 kW) and 412 lb⋅ft (559 N⋅m) of torque. 7-10. engines even with higher static compression ratios is just fine as Feb 22, 2021 · For example, early Gen III 6. LS2 Specs: Displacement: 6. 5 toss 64. 5:1 was ideal. 9:1 Compression ratio with 9. 1:1, but in reality, it was 10. so if a stock LS1 has 9. 000 Stroke 3. It makes just shy of 500RWHP. The 5. Let's discuss what they are and how they play a role in tuning. 25:1 and the LS6 10. Feb 8, 2018 · LT1 Block Specs; Casting Numbers: 12619171, 19329617: Material: 319-T7 Aluminum: Displacement: 6. 070" PTV for the intake, This is a little tight but Aug 23, 2007 · This Chevy LS2 crate engine has its XR265HR camshaft replaced with a Comp Cams XER281HR and its stock cylinder heads are replaced with freer-flowing pieces from TEA to create a 575 hp naturally . 5:1 Horsepower = 650 @ Torque = 525 @ RedLine = 7,500 RPM LS2: Displacement = Bore x Stroke = Compression Ratio = Horsepower = Torque = RedLine = Fuel Cut OFF = LS7: Displacement = 7. 2:1 while the LS2 has a compression ratio of 10. its a pattern more boost higher compression ratio's but you would be safe with 9. The first of the Gen IV small-blocks, the 400hp LS2 was first unveiled in the '05 Corvette. 030" mill. 9:1 compression ratio with a Gen IV block to make 395 hp on premium fuel. It's always less. This is the amount that the air inside the cylinder is compressed. 0L 11. 6. 052 gasket / -6. That same timing was used in the first TRex cam in a stock longblock 5. Other applications had reduced Sep 8, 2009 · The basic engine in the 2005 Chevrolet Corvette was the LS2 V-8, similar to the LS6 motor that was used until 2004 but with increased performance functions. Aug 17, 2020 · All 6. If cam specs are available, you can calculate "dynamic" compression ratio and use this to determine the ideal static compression ratio for your combination. hwwcpp liw iahav gzspx zqwknx ezimg kgvrdra ercgc mllwm kikd