HCI and timing question.

[Dbeck002]

Im gonna run someone soon and i want to know what all of you guys with

AFR165s, TFS1 cams and 3924 autolites run for timing.

I run 14 degrees on 93 octane, My shop says i can run more with np if i want to.

Before the heads i ran like 17 degrees on 93.




BTW the heads are the 58cc. so CR is like 9.7:1.

What do the experienced ones say?

 

[5spd GT]

I have AFR 165's with the 58cc as you do.

I run 16-17* of timing with 93 octane.

The 3924's are gapped at .045.

 

[Grn92LX]

Yeah 16-18* may work out good. Its not a matter of the most you can run, its what your engine likes best. 58cc head, stock pistons, you are maybe 9.3:1 compression fyi. You can probably get away with 89 octane as well.

 

[Dbeck002]

Thanks for the info guys.

Also one more thing, The guy at the dyno adjusted my fuel pressure and timing a certain way that it would make the power it makes now. If i bump up the timing will that mess up the entire tune he did for me?


Also, i thought that 58cc heads bring it up to like 9.6:1... i think i read on the AFR website, not sure. Plus i have a lot of carbon buildup so that should add a 10th.

What do you guys say?