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Originally Posted by Soravia
I have a question.
I see that FA20 engine has coated piston skirts for reduced friction which is supposed to be part of enabling higher RPM operations. I like higher RPM engines.
Will making vertical grooves on the piston skirt (without cutting too much into it to reduce strength) help enable higher RPM?
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Not only will that not work, you will get a ton of blowby and burn oil like it's going out of style. Not a good idea. :P
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How much of a harmonic is affecting higher engine RPM. (The pulley fore of the crank)
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On modern engines, very very little.
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Will changing crank and rod (increase rod length, reduce the crack turn radius) enable higher RPM?
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Generally speaking, yes. However, there's a lot of other things required to make this happen. Oiling on the bottom end, bearing clearances, and a whole entire set of top-end changes need to go with this idea.
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Not considering combustion process, what are other mechanical factors of the engine pieces that limit higher RPM? I see that F20C can rev to 9,000 RPM red line and it's just an inline 4. Boxers are supposed to be better at higher RPM operations.
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Boxes are absolutely not better than inline engines at high RPM. Not sure where you got this idea. The F20C made a lot of design tradeoffs to get it to rev that high, which IMHO aren't such great tradeoffs (I'm not an RPM guy at all BTW).
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I'm talking about having the FA20 run at 8,500 RPM making power all the way there without taking it to a race engine builder.
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From the mechanical specs I've seen so far, it would take >$10k in parts and a complete rebuild to make this motor do that with any reliability.
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A separate question, I know cars have knock sensors next to cylinder walls. Is it feasible to have vibration sensors (accelerometers) on the engine in various angles to measure how much the engine is vibrating? It is used on aircraft parts to measure the conditions of engine and power-train parts, transmissions, gearboxes, drive-shafts, bearings, etc.
Thanks.
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You could, but what would you do with this information?