---------- Original message ----------
From: The Gilson Family
Date: Fri, Jan 22, 2010 at 5:32 PM
Subject: 1931 Chevrolet
Bill, I thought you might like to share this information on the
site. I take an antique auto restoration class through a local
community college and I decided to bring one of my freshly re-built
1931 Chevrolet distributors in for a test. We used a Sun
Distributor machine to evaluate the advance curve. The results are
Knowing the maximum advance of your distributor and the RPM that it
peaks at is relevant to fine tuning your car for better
performance. You never want your total advance to go over 36
degrees. Therefore, if you set your timing at 18 deg BTC (flywheel)
and you add 12 deg Advance max from your distributor, your total
maximum advance would be 30 degrees.
This particular distributor peaks at 1200 distributor rpm, or 2400
Just for kicks, I tested an un-restored 1931 Chevrolet distributor
that was not taken apart, cleaned and re-lubricated what-so-ever.
The results showed that the maximum advance was only 7 degrees at
1150 distributor rpm. We turned up the speed to 1500 rpm and it did
not change the 7 deg. max.
Just like anything else, if you want it to work properly, make sure
each part works properly.
P.S. I hope this information is useful.