I have a question for you guys: Can too small andvance induce knock?
I have a stroked RS2 with 8.25:1 CR and 7A camshafts and i am in the process of mapping the engine. Yesterday i could not get and 98+ fuel so i tanked 95 and thought that maybe is good to make a map for low octane fuel also.
I have noticed that the engine had minor knock at 1 bar and above (didnt go pat 1.3 bar) from 4000 RPM onwards even with a timing advance of 9 degrees.
Does any of you have experience with a stroker Audi I5 engine?
Knock can be caused by retarded ignition due to the fact that extremely hotter then normal exhaust gases heat up the exhaust valve that will then later work as a ignition source when fresh charge hits it under compression stroke.
So yes.
http://en.wikipedia.org/wiki/Engine_knocking#Pre-ignition
in that case shouldnt i see high EGT? I will try to raise it and see how it behaves also with proper fuel.