Not surprising, another member in this thread that knows what he is talking about. We are one step closer to an educated evolutionm.net.

 

OK, cute little back-n-forth comments. Now how about you both get back on topic?

 

Phantom knocksums under 4000rpms.

 

I am not having issues with this on my friends stroker evo w/o balance shafts. My other friends 6 bolt 2.0L non balance shaft 2g talon on Link is also not having issues. I don't have issues on my 9 thou piston/wall clearance 1g. Neither did I when my motor was stock minus balance shafts. I have seen it be an issue on 100% stock cars (especially 1g's). I have code that ignores the knock sensor up to 1.0grams/rev for those issues. However in the past, before the code, 90% of the time those issues were resolved by replacing the lash adjusters, replacing the knock sensor, checking the base ignition timing and possibly altering part throttle timing/fueling. My personal 1g had phantom knock issues in 2000 and after catching up on maintainence it was fixed. Your probably aware of the phantom knock list on yahoo groups and I was an active poster back in the day.

 

"Never assume knock to be phantom" is my approach. If there's knock sum registered, there's knock.

Once thought I was getting phantom knock. Found out the PVCC oil trap was full leaking a small amount of oil into combustion. Since oil has an octane of about nothing - it knocked.

Cleaned oil trap and it was fixed.

 

Yeah but low load (IE: part throttle knock) isn't dangerous. You can have real part throttle knock (usually ignition advance related) for years and it won't hurt a thing. Under load though knock starts becoming dangerous as the peak pressure of the detonation event starts growing exponentially. Also low RPM high load knock is MUCH more dangerous than high rpm high load knock. At high rpm's the piston is running away from the detonation wave at a faster rate than at low RPM. At low RPM the piston has to absorb a much larger amount of the detonation event.

 

interesting makes sense