im curious to know how much total timing advance u guys are running on your non-stock engines?

dave

 

36 and 38, wouldn't the info be more relivent if you ask what the engine combo was too?

 

Yea, 36-38 with natural aspiration. I run mine on the high side, and probably could get away with 40° at my altitude (6300ft).
Don't forget fuel octane/additives/types have major affects on burn timing.

Ron

 

36 to 38 degrees seems to be the most common.i wanted to see if someone was running timing outside of 36-38 degrees.let me elaborate on the "nonstock engine" a na motor that have aftermarket heads,cams(more duration),higher or lower compression etc

dave

 

The only real way to find out your total for you is to start at 36° and start adding it till it pings. Normally higher compression you'll need slower burning fuel (i.e. higher octane) to keep from pinging at 36° at WOT.
Anything that cranks up combustion temperatures speeds up the burn, and you'll have to close the gap between ignition & TDC.(i.e. retard the timing)

I never seen cams make much of a difference in combustion temps, but head material, & compression do.
Aluminum draws heat out of the combustion chamber faster than iron, so aluminum lowers the temp.
Engine load affects temps a lot also; in fact you can get away with a lot more than 36° when just cruising under light throttle. (i.e. computer advance or vacuum advance)

Hope that helps a little...

Ron

 

32 to 36 depending..........