2008 Corvette Powertrain
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Transcript of 2008 Corvette Powertrain
2008 Corvette Powertrain
Powertrain Lineup
6.2L V8 (6162 cc)
430 hp @ 5900 rpm (SAE certified)
436 hp @ 5900 rpm w/ optional exhaust (SAE certified)
Hydra-Matic 6L80 six speed automatic
Tremec six-speed manual (w/two optional gear ratios)
Powertrain Engine Improvements – Piston / Rods
Larger flat top piston design @ 10.7:1 compression ratio
Addition of 4 drilled piston oil drainback holes and higher oil control ring tension to improve the high speed operation at higher performance
Piston profile and pin bore optimization for NVH
Tapered pin ID for mass reduction
Rod bolt joint enhancements include new 12.9 grade rod bolts - similar material as LS7
Powertrain Engine Improvements – Valvetrain
Valvetrain
Intake valve diameter increased to 55 mm vs. LS2 50.8 mm
Hollow intake valve for mass reduction to maintain high speed operation and the 6600 rpm redline
New inlet rocker arm offset by 6mm between valve tip and rocker bolt/ pushrod to enable an improved airflow path
Gen III/IV conventional rocker arm
High flow head offset inlet rocker arm
Intake Port Flow Results
Small Block Cylinder Intake Port Flow flowboxes, baselines, alum bellmouth for all
Mass Flow Rate (grams/sec)
142.2
166.4
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Valve Lift (mm)
Mass Flow Rate (grams/sec) @ 7 kPa
LS2 LS3 17% increase
Exhaust Port Flow Results
Small Block Exhaust Port Flow all w/ 41.3mm ext pipe
Mass Flow Rate (grams/sec)
118.3
125.6
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Valve Lift (mm)
Mass Flow Rate (grams/sec) @ 7 kPa
LS2 LS3
6.2% increase
LS2 vs. LS3* Power and Torque
*SAE Certified
Powertrain Transmission – Hydra-Matic 6L80
Six speed, rear mount, automatic transmission
Driver shift control
Clutch-to-clutch
The LS3 with the 6-speed paddle shift automatic is the fastest automatic Corvette ever with 0-60 mph in 4.3 seconds.
Powertrain Transmission – Tremec six speed manual
MM6 MZ6First 2.66 2.97Second 1.78 2.07Third 1.30 1.43Fourth 1.00 1.00Fifth .74 .84Sixth .50 .57Reverse 3.42 2.9
Powertrain Engine Improvements – Results
Increased power
1/4 mile: 12.4s @ 117 mph vs.12.6s @ 114mph