Quote:
Originally Posted by ChevyRules
HP/liter is heavily biased towards DOHC vs OHV. The engine breathes better due to 4 valves vs 2 valves in the OHV setup and can rev more than the OHV. Thus you don't need to have a big of a displacement to make the power. But you do need to rev the engine out to make such power( the Voodoo V8 is a perfect example of this) and is a physically bigger motor thus creating packaging issues( the Coyote V8 will not be able to fit in the Corvette).
The OHV design can't breath as well nor can rev as high as the DOHC architecture, so need displacement to make power. The benefit of using displacement to make power is a ton of torque being made down low. Also, an OHV engine is physically compact. How the LT1 can fit in the Corvette. Heck its the reason why the Small Block V8 is such a popular crate engine. Can throw it in a Porsche, Miata, etc with very little mods.
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This guy has the right idea. The coyote will demonstrate a higher volumetric efficiency due to the DOHC and 4 valve head. All of this will be become much easier to compare when the 6.2 DOHC is released by GM ( I'm guessing in the C8 vette). I'm betting it will have the same stroke as all of the gen 3 and gen 4 veteran engines (except LS7). Hell, look at the SB4 7.0 from Mercury Racing, and it's not even direct injected.
http://www.mercuryracing.com/automotive/