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  • Sticky's Avatar
    Today, 10:45 PM
    The C6 ZR1 and C7 Z06 have engines have some similarities. They both have the same 6.2 liter displacement and both are supercharged V8 engines. The similarities pretty much end there though as they are two different generations of GM supercharged V8's. The LT4 of course incorporates direct injection which allows higher compression at 10.0:1 compared to the 9.1:1 of the LS9. The LT4 also has a smaller 1.7 liter supercharged compared to the LS9 2.3 liter unit. It is quite a bit smaller but also 20 pounds lighter. They both have the same 6600 rpm redline. Let's break down each motor with GM's own details: LT4 6.2L supercharged engine specifications Displacement (cu in / cc): 376 / 6162 Bore & stroke (in / mm): 4.06 x 3.62 / 103.25 x 92 Block material: cast aluminum Crankshaft: 1538MV steel Connecting rod (in / mm): 6.125 / 155.5 powder-metal steel Piston: forged aluminum with internal ribs; flat-top crown Cylinder head material: A356-T6 rotocast aluminum Induction system: 1.7L supercharger 9.4 psi / 0.65 bar max boost Valvetrain: overhead valve, two valves per cylinder Valve type (intake / exhaust): 54mm solid titanium / 40.4mm sodium-filled Camshaft type: hydraulic roller Intake valve lift (in / mm): 0.492 / 12.5 Exhaust valve lift (in / mm): 0.551 / 14 Duration @ 0.050-in. tappet lift (crank angle degrees, intake / exhaust): 189 / 223 Camshaft lobe separation angle (degrees: 120 Fuel delivery: direct injection Fuel injectors: 25cc/second (1.5L/min) Engine-driven fuel pump (psi / MPa): 2900 / 20 Lubrication system: dry sump, incl. oil-spray piston cooling Compression ratio: 10:1 Horsepower (hp / kW @ rpm): 650 / 485 @ 6400 SAE certified Torque (lb-ft / Nm @ rpm): 650/ 881 @ 3600 SAE certified Max. engine speed (rpm): 6600 Recommended fuel: premium required LS9 6.2L supercharged engine specifications The LT4 is rather at 650 horsepower and 650 lb-ft of torque despite the smaller blower. The LS9 is rated at 638 horsepower and 604 lb-ft of torque. The difference between the two in practice at the wheels is even greater than the crank ratings on paper: 49 wheel horsepower and 84 lb-ft of torque at the wheels difference in favor of the LT4 over the LS9. These numbers really make one wonder why the C7 Z06 is not putting up better performance numbers.
    0 replies | 3 view(s)
  • AdminTeam's Avatar
    Today, 09:34 PM
    Welcome Zachary, take a look around, I think you will like what you see.
    0 replies | 36 view(s)
  • AdminTeam's Avatar
    Today, 09:31 PM
    denberg, we appreciate you taking the time to join.
    0 replies | 18 view(s)
  • Sticky's Avatar
    Today, 09:24 PM
    For the Socal guys. Definitely sound like fun:
    0 replies | 13 view(s)
  • Sticky's Avatar
    Today, 09:19 PM
    I get football a day early so I'm kind of cool with it especially considering Christmas is around the corner. The games will just speed things up. Yay.
    1952 replies | 74322 view(s)
  • Torgus's Avatar
    1952 replies | 74322 view(s)
  • Sticky's Avatar
    Today, 09:04 PM
    I didn't realize we were going to have saturday games. Wow, why is that? I kind of like it.
    1952 replies | 74322 view(s)
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