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Chris, I have heard the 917 motor described as a "180 degree V 12" because it has two rods per throw, while a boxer 12 would have each rod on its own throw as does the 911 engine. So in that regard the 917 motor is sort of an enlarged, twinned 911 engine. I would think that this distinction would significantly change the mass-elastic behavior. If that is correct, then I do not think that what applies to V6's could be transferred to boxer 6's but I could easily be wrong.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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