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L99 engine specifications



2010 "L99" 6.2L V-8 VVT ( L99 )
6.2L V-8 (L99) CAR ENGINE

Features and benefits

-New engine offering in the Camaro SS

-First Small Block Car engine with VVT

-Active Fuel Management ( automatic transmission models )

-SAE Certified Power & Torque

-High flow cylinder heads

-Higher flow intake manifold with acoustic shell

-Larger bore block with structural improvements

-Pistons ( high engine output design )

-High flow injectors

-Acoustic beauty cover

New engine offering in Camaro
The "L99" V-8 is now available in the Camaro SS. The L99 performance is SAE Certified at 400 hp @ 5900 rpm and 410 lb-ft. of torque @4300 rpm. The "L99" V-8 will be mated up with the Hydra-Matic 6L80 (MYC) six-speed automatic in this application.

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 LS3 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 55.0 mm and the exhaust valve diameter is 40.4. Intake and exhaust lift art at 12.7mm. The valvetrain was modified to interface with a cam phaser to provide 30 degrees of cam phaser authority. AFM Lifters in cylinders 1,4,6, and 7 and the AFM control system enables V4 operation at engine operating conditions where V4 mode is more efficient.

Higher flow intake manifold with acoustic shell
Intake ports revised to match cylinder head. The 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 casting is shared with the the 6.2L truck applications, 6.2L LS3 applications, and 6.2L supercharged LSA and L99 applications.

A larger diameter piston design features design enhancements for the higher engine output.

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

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

For the 2010 Camaro, General Motors engineers objective was to provide greater fuel efficiency by introducing Active Fuel Management technology and VVT technology to the automatic transmission application of the Camaro SS performance engine.

The L99 balanced the use of performance design features of the LS3 while introducing proven fuel efficiency enhancements used on the high volume truck applications. The L99 used the LS3 base engine block, head, intake manifold design elements to increase flow efficiency. The L99 also meets the more stringent Bin4 emission standards and again avoids the gas guzzler tax. The small block tradition of more for less continues.

[top]2010 CAMARO Engine Comparison

Specifications3.6L V-6 DI VVT (LLT)6.2L V-8 (LS3 / L99)
Application:LS, LTSS
Type:3.6L V-66.2L V-8
Displacement (cu in / cc):217 / 3564376 / 6162
Bore / Stroke (in / mm):3.70 x 3.37 / 94 x 85.64.06 x 3.62 / 103.25 x 92
Block material:cast aluminum with cast-in-place iron bore linerscast aluminum with cast-in-place iron bore liners
Cylinder head material:aluminumaluminum
Valvetrain:dual overhead camshafts, four valves per cylinder, continuously variable valve timingvalve-in-head. two valves per cylinder. roller lifters. Active Fueld Management (L99)
Ignition system:electronic individual coil-on-plug. individual cylinder knock control and extended-life platinum-tipped park plugshigh-energy distributorless ignition. solid state direct-fire ignition with coil near plug and integrated ignition
Fuel delivery:direct high pressure fuel injectionreturnless, multiport fuel injection
Compression ratio:11.3:110.7:1 (LS3)
10.4:1 (L99)
Horsepower (hp / kW @ rpm):304 / 224 @ 6400rpm426 / 315 @ 5900rpm (LS3)
400 / 299 @ 5900rpm (L99)
Torque (lb-ft / Nm @ rpm):273 / 370 @ 5200rpm420 / 553 @ 4600rpm (LS3)
410 / 535 @ 4300rpm (L99)
Recommended fuel:regular unleadedpremium
Maximum engine speed (rpm):7000 RPM6200 RPM (L99)
6600 (LS3)
Emissions controls:evaporative system, single closed coupled catalytic converter, equal length exhaust, single underfloor catalytic converter, positive crankcase ventilation, intake and exhaust cam phasers, electronic throttle controlevaporative system, closed coupled catalytic converters, positive crankcase ventilation, electronic throttle control
Fuel economy:Auto: 18 city/29 hwy
Manual: 19 city/29 hwy
Auto(L99): 16 city/25 hwy
Manual(LS3): 16 city/24 hwy
Fuel tank (gal / L):19 / 71.919 / 71.9
Engine oil capacity (qt / L):7.6 / 7.28.9 / 8.5

[top]Dyno Charts

[top]Cutaways / Images

[top]Differences w/ LS3 Engine

  • L99 used in automatic version SS models. LS3 is used in manual version SS models.
  • L99 produces 400hp/395lb-ft tq compared to LS3's 422hp/408lb-ft tq.
  • L99 camshaft is different -- having a little less duration and a little less lift, both of which give the engine a smoother idle.
  • L99 has a cam phaser and, to get the additional piston-to-valve clearance required when cam phasing changes, the pistons are different parts having valve reliefs machined into their tops. The reliefs lower the compression ratio to 10.4:1.
  • L99 PCV system is different having its oil separators in the valve covers rather than down in the valley like the LS3. [source]

Contributors: Tran, Milk 1027
Created by Tran, 10-19-2008 at 11:40 AM
Last edited by Milk 1027, 09-03-2009 at 01:26 AM
0 Comments, 74,838 Views

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