The Ford Barn

tubman · 10-11-2016, 04:06 AM

I was talking to a friend of mine who is an electronics expert. Several years ago, he was involved with an outfit that was building engines for ARCA racing. He was telling me about a problem they had with distributor rotor phasing with some highly modified engines. Essentially, the distributor had been modified enough that the rotor was not pointing directly at the terminal in the cap, causing high-speed misfires. They solved the problem by slightly re-positioning the drive gear on the input shaft.

This leads me to wonder if this might be a problem with SBC Chevrolet distributors converted for 8BA use. Perhaps I am overthinking this, but it seems that, unless some care is taken, the rotor might just end up pointing between two terminals in the cap, causing problems at different portions of the advance curve.

Bubba, have you ever encountered this?

10-11-2016, 04:06 AM	#1
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 11,633	Distributor rotor phasing I was talking to a friend of mine who is an electronics expert. Several years ago, he was involved with an outfit that was building engines for ARCA racing. He was telling me about a problem they had with distributor rotor phasing with some highly modified engines. Essentially, the distributor had been modified enough that the rotor was not pointing directly at the terminal in the cap, causing high-speed misfires. They solved the problem by slightly re-positioning the drive gear on the input shaft. This leads me to wonder if this might be a problem with SBC Chevrolet distributors converted for 8BA use. Perhaps I am overthinking this, but it seems that, unless some care is taken, the rotor might just end up pointing between two terminals in the cap, causing problems at different portions of the advance curve. Bubba, have you ever encountered this?