Anybody have an idea, process or technique for measuring sine waves? I have an old (10+ years) alt putting out good voltage. Problem: + - 3 degrees of timming variance at higher rpms 3 to 6 k. I read recently that this may be my problem. (every other possible avenue for this issue has been addressed)Has anyone experienced this?

Thanks in advance.

Roy

 

Try shimming your distributor.

 

Thanks Apeiron, I verified oil pump driveshaft length clearance of .010 to .040 during initial assembly but I will check it again. Thanks for the idea as I have not rechecked that since pre assembly fitting.
Roy

 

Cheched up and down movement of the main shaft as D.U.I. Distributors instructs. Yes I have movement so the distributor is not bottomed out.

 

Can't you just measure AC voltage? IIRC, you should never see more than 3VAC or you need a new alternator (Or to replace your regulator in the alternator)