spark at TDC? or before?

[jr dragster T]

Yes the coil starts to trigger before TDC but the plug never fires till about .280" in the hole.

 

[IHcubguy]

point i was making is, i don't think they come from the factory at peak hp! maybe they do i figured thay have EPA guidelines to stick to,............ time to end this post!

 

[IHcubguy]

Russ!!...........it was a point i was trying to get across, even thou it doesnt have anything to do with the original post!

 

[Rickracer]

Factory ignition timing is great.......if you're only gonna turn 3600 rpms. A lot of performance karters wanna run at least near twice that, which require more ignition lead time, that's why there are offset keys available. But this IS totally unrelated to the original question....