Quote:
Originally Posted by lucid
Eastie, I did look this up, and there was a section in the book. There is no simple answer as they cite 10+ variables that affect the combustion dynamics during knocking. However, torque loss clearly seems to be a function of spark advance and engine speed. The loss that results from retarding the spark advance can vary from 10% at low rpms to 1% as the engine reaches the higher rpms. This is a pretty general statement though, and does not necessarily directly address the 95/98 scenario.
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I remember reading somewhere that the best estimates were 5% lose in power, which remember wouldn't result in a 5% lose in performance. Fuel ecomony is also affected and in this the best estimates are 2~3mpg depending on driving conditions. These results were based on a Golf GTi Mk5.
But lucid is correct that the effect varies in relation to engine revs.
P.S.
I wish I could remember the book I read this in.
