Quote:
Originally Posted by BongoBennie
You can't say you know how much all these things weigh as there are 4 cylinder engines that weight more than V6s etc, you are also not considering the rotating/reciprocating mass.... turbo are actually used MORE for efficiency than max power, thats why just about every big rig, tractor, train, bus etc in the world has one
There is a theory that an engine with low enough yet still positive manifold pressure will actually get better MPG than the same sized NA motor because the motor doesn't have to 'suck' the air in...... Im not too sure about that since our atmosphere is technically under pressure, but it might.
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Those are diesel engines, not the same thing. A spark ignition engine running 1.1 equivalence ratio, max possible compression with minimum possible pumping and volumetric efficiency, and a turbo to recover the very slight amount of blowdown would be more efficient than a diesel at peak load yea. Efficiency depends on application and operating conditions.