Quote:
Originally Posted by Isaac Zackary
just widening the intake or exhaust doesn't mean better efficiency. Everything in the intake and exhaust is pulsing with each intake and exhaust stroke. Harmonics become much more important here, which is affected greatly by runner diameters and lengths as well as resonate chamber designs. In other words, widening things can be just as bad as making them more narrow
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Much like that Ford/Simca Aquillon engine, which had a truck version with narrower intake and exhaust in order to improve low-end torque. One could easily guess that engine in a Ford Vedette with a slightly higher rear-end to be likely to provide some better fuel-efficiency...