Quote:
Originally Posted by serialk11r
I know that. However to make it worth the extra piping you have to run significant boost pressure, preferably at high rpm. The engine block may be smaller but the extra exhaust piping, intercooling, etc. will add weight back. A small 4 cylinder engine weighs barely over 200 pounds, so a 40-50 pound increase from a turbo kit is very significant.
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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.