Quote:
Originally Posted by Hyper4mance2k
Incorrect about the headers. The Sky Active can run lower octane because they are Atkinson Cycle engines. So it's the cam timing, but nothing that can be emulated here.
Also, compression ratio has nothing to do with cam timing. Cam timing changes volumetric efficiency, some like to call it dynamic compression ratio, but that's just not a real thing.
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Semantics. There's no strict guideline that makes one engine Atkinson cycle or not. Some race engines have lower VE than a Prius engine at the same speed.
Cam timing changes VE, and thus cylinder temperatures. That's what I'm talking about. The headers absolutely have something to do with knock prevention as well as torque output. And it can be emulated here with different cams.
Thanks for the useless comment.