9D4Z28

hi i wasnt sure where to post this question but whats the diff between the ls2 and the ls3? which one in superior? i heard that the ls3 is better boost applicable than the ls2?

demarco313

LS3 is superior. I would assume not by alot though. Its a newer engine and bigger displacement. There's no replacement for displacement

BlackScreaminMachine

iTrader: (17)

Do a google search, I am sure someone made a internet page comparing. I do know its a larger bore then LS2, a different cam set up (VVT), and head design changed again. IMO superior but depends on what your using it for and the cost. Which is a whole other conversation.

http://www.camaro5.com/forums/showthread.php?t=1977

http://www.camarohomepage.com/ls3/

http://www.hotrod.com/techarticles/e...ces/index.html

2008 “LS3” 6.2L V8 (LS3)
6.2L V8 (LS3) CAR ENGINE
Description of New and Update Features



· Displacement increase to 6.2L from the 6.0L LS2

· Performance enhancement from base Corvette LS2

· SAE Certified Power & Torque

· Horsepower increase from 400 to 430

· Torque increase from 400 to 424 lb.ft.

· Additional +6 Hp increase with optional active exhaust system

High flow cylinder heads
Enhanced valvetrain
Higher flow intake manifold with acoustic shell
Larger bore block with structural improvements
New pistons
Higher flow injectors
Acoustic beauty cover

Overview
For 2008, General Motors Powertrain engineers have again added a performance kick to the Corvette base engine with introduction of the new LS3 6.2L engine which replaces the LS2. The 2008 6.2L LS3 V8 with 430 Hp @ 5900 rpm and 424 lb.ft. torque @ 4600 rpm is the most powerful Corvette base engine ever and is SAE Certified for 2008 model year.

The LS3 engineering team focused on design elements to increase flow efficiency in addition to the displacement increase to meet the performance enhancement. The bore was increased to a larger 103.25 mm diameter compared to the LS2 bore of 101.6. Engine stroke remains at 92.0mm. Intake flow efficiency was optimized by straightening out and optimizing the flow path from the intake manifold into the cylinder heads. A high flow efficiency induction system is borrowed from the Z06 application. The cylinder head exhaust ports have been modified to increase flow. Also now available in the Corvette with the LS3 is a butterfly valve in the exhaust system which opens at high exhaust flow levels and by-passes the “tri-flow” S-shaped path the exhaust gases normally follow. This reduces exhaust restriction, yet allows the Corvette LS3 to hum at a more muted burble during part-throttle operation. The LS3 also meets the more stringent Bin4 emission standards and again avoids the gas guzzler tax. The small block tradition of more for less continues.

High Flow Cylinder Heads
The intake port shape size and shape have been modified to increase flow. The higher flow intake ports are similar to the L92 6.2L. Casting changes were made to increase the opening at the exhaust face to improve exhaust port flow. A new exhaust manifold opening is required to match the heads.

Enhanced valvetrain
The inlet rocker arm is offset 6 mm between the valve tip and rocker bolt/push rod to enable a more direct intake port. The intake valve diameter is increased from 50.8 to 55.0 mm. Hollow stem intake were implemented to enable the 6600 rpm capability (13% reduction in mass from LS2). The 40.4 mm diameter exhaust valves are carried over from L92. Carryover LS2 high load valve springs are also included for 6600 rpm capability. Intake lift increases from 13.25mm to 14.0mm. Exhaust lobes are carryover LS2. Camshaft timing is revised.
Higher flow intake manifold with acoustic shell
Intake ports revised to match new cylinder head. The new composite intake manifold is manufactured with a lost core process to improve runner to runner variation and to reduce flow losses. Acoustic foam is sandwiched between the outside top of the intake manifold and an additional “skull cap” acoustic shell to reduce radiated engine noise. Structural enhancements have been added to the manifold bosses.

Larger bore block with structural improvements
Casting and machining in the bulkheads was revised to improve block structure and to improve bay to bay breathing. The enhanced cylinder block is shared with the the 6.2L truck applications.

New Pistons
A new larger diameter piston design is introduced for which includes design enhancements for the higher engine output.

Higher Flow Injectors
Higher flow 5.0 g/s injectors were used from the LS7 engine.

New Acoustic / Beauty Cover
The new beauty cover has a revised appearance and new acoustic treatment

9D4Z28

what is the displacement of the ls2 and ls3?

99FormulaM6r

iTrader: (2)

6 liter for the ls2, 6.2 for the ls3. It's all in that post....

9D4Z28

Thanks that helps a lot

BlackScreaminMachine

iTrader: (17)

LT1 = 4.000" Bore 350 CID
LS1 = 3.900" (99.06mm) 346 CID
LS2 = 4.000" (101.6mm) 364 CID
LS3 = 4.065" (103.25mm)

LS2/3 Stroke 92.00 MM = 3.622"

6.16 Liters for LS3 Rounded to 6.2L
5.97 Liters for LS2 Rounded to 6.0L
5.67 Liters for LS1 Rounded to 5.7L

http://mg-jewelry.com/mmtoinches.html for conversion
http://www.race-cars.net/calculators...alculator.html for CID calc

9D4Z28

whats the compression like ? is the ls3 more boost applicable?

BlackScreaminMachine

iTrader: (17)

You gotta read man. 2nd link, 2nd pg, near the bottom

The bulge in the LS3 chamber exists solely to get the air-fuel mix to tumble more as the piston nears the point at which the spark lights that mixture. The bulge is also responsible for a slight increase in chamber volume, from 67.3 cc. on LS1 to 68.7 cc . on LS3. The chamber volume, combined with the LS3 piston make for a compression ratio of 10.7:1

I would have to search for a ZR-1 engine which is LS3 and fitted with a blower, I am not sure if they got a lower comp pistons.

ULTIMATEORANGESS

iTrader: (4)

if i could afford it i wouldve bought an ls3 for my SS.

Tainted

iTrader: (9)

you can put the LS3 top end on your LS2 motor

Buffalo

My dealership is selling brand new LS3's for $5500. Its got me thinking.

crazymonkey

iTrader: (2)

this some good info ....

SOMbitch

iTrader: (8)

Not by a longshot....same block but different pistons, rods, heads, head bolts, piston oil squirters, cam,Ti intake valves, head gaskets, dry sump, intake, handbuilt....off the top of my head.....

crazymonkey

iTrader: (2)

thats hell of deal ... doesn't ls3 typically go for $8xxxx plus

garygnu

gmdp sells them for $6200,but you need a conversion kit to install in a ls1 car.t5he ls3 is 374 ci.

BlackScreaminMachine

iTrader: (17)

I am pretty sure I said, I would have to search. But long story of the short, you can slap a similar after market set up on a stock camaro and make good power, so it is not a long shot.

cybernco

In addition to the great info that BlackScreaminMachine gave us, the LS3's bore stroke ration makes it more oversquare than the LS2's which results in an engine that revs a little quicker.