Quote:
Originally Posted by Cymaro
Say you have a 3.0L inline 4 cylinder, a 3.0L v6 , and a 3.0L v8 engine. All DOHC to be consistent. Would they all... use the same amount of fuel?
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For the same reason DG3 mentions "friction" (aka "pumping losses"), those pumping losses GENERALLY contribute to slightly lower mpg ratings, per displacement, as you ADD cylinders. Fewer cylinders to fire requires, typically, less fuel, as well.
The OTHER side of this discussion: How do you make a 4 cylinder deliver more power (like a "bigger"/ more cylindered engine) while enjoying better fuel economy than a V6? V6 vs. V8?
"Boost", aka turbo- or super-chargers, which have become the
EPA-challenged method of choice, but have been around literally for decades. Modern electronics, combined with usage of exotic materials and/or application of same (coatings) to updated internal "boost" components and technologies, are allowing these methods to be more widely applied.