Posted by oldtanker on August 09, 2012 at 22:08:01 from (66.228.255.239):
In Reply to: timing by ear posted by picassomcp on August 09, 2012 at 20:57:03:
Before anytimeing adjustments are made the engine should have a tune up!
Actually on older engine with vacuum advance the timing will not be right with a light before the engine is broke in or after the engine is worn enough to have lower vacuum levels. Worn timing chain makes the problem worse. Best cheap way to time em is hook up a vac gauge, advance the timimg until max vac is achieved and back it off 2" (LBS to people that don't know that vac is measured in "). On newer computer controlled engines get it close and the computer takes it from there.
On mechanical advance if anything is worn, timing chain, springs, weights or pivot pins you are not going to get it right with a light.
I can't begin to count the number of timing adjustments I've had to make to get peoples cars run right that they timed by ear!
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