73LemonTwist
Well-Known Member
I have a stock 340, with the original distributor in it. I have been working on the new Demon carb to improve off idle throttle response.
Today I noticed that when I hit the throttle, the timing light shows that the advance first drops 5-7 degrees, then picks up as the engine accelerates and centrifugal advance increases. The distributor still has the stock springs and weights.
The vacuum advance is disconnected (but on the '73 it has the OSAC valve to delay vacuum advance anyways).
My base advance is set about 12 degrees BTDC.
Any ideas what would cause the initial drop in the advance?
Today I noticed that when I hit the throttle, the timing light shows that the advance first drops 5-7 degrees, then picks up as the engine accelerates and centrifugal advance increases. The distributor still has the stock springs and weights.
The vacuum advance is disconnected (but on the '73 it has the OSAC valve to delay vacuum advance anyways).
My base advance is set about 12 degrees BTDC.
Any ideas what would cause the initial drop in the advance?