Quote:
Originally Posted by Levi
You did a sound analysis quite easily, could do it to figure out if the engine is I6 or V6 (90°)?
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That's easier to do by ear than it is through frequency analysis because of the difference in character between a cross-plane V8 and an I6. A cross-plan V8 has a "double" combustion event on each side as it works through the firing order. Scroll down to the "Chevy V8 Firing Order" graphic on this page to see what I mean:
http://craig.backfire.ca/pages/autos/v8-engines#firing
For a given RPM, a V8 will have a higher sound frequency, because it has more combustion events per revolution, so if you know the RPM, it's trivially easy to determine the number of cylinders through frequency analysis.