Distributor vacuum can question
Thread Starter
Melting Slicks
Joined: Jul 2010
Posts: 2,503
Likes: 33
From: McGrady NC
St. Jude Donor '15-'16
Distributor vacuum can question
I have an aftermarket distributor and I need to adjust the vacuum can a little to stop some part throttle/midrange spark knock. Which way do I turn the adjustment (small allen wrench through the vacuum port) to decrease advance? Of course, the dizzy had no paperwork with it. Car runs great otherwise.
Melting Slicks
Joined: Oct 2001
Posts: 2,064
Likes: 1,382
From: Halifax, Nova Scotia, Canada
This is the one I installed, Accel. Likely same unit as above.
http://shop.accel-ignition.com/adjus...points-v8.html
Click on the "Instructions & Troubleshooting" banner and you will get a .pdf file.
The only other change I made was to mechanically limit the degrees of advance and only used the adjustment for the vacuum required.
I found that 15 degrees of advance was about all I could do, without surging at cruise speed. I limited the advance to that amount by putting a "restriction" on the advance shaft.
After adjusting, 12 inches of vacuum seemed to be the best.
http://shop.accel-ignition.com/adjus...points-v8.html
Click on the "Instructions & Troubleshooting" banner and you will get a .pdf file.
The only other change I made was to mechanically limit the degrees of advance and only used the adjustment for the vacuum required.
I found that 15 degrees of advance was about all I could do, without surging at cruise speed. I limited the advance to that amount by putting a "restriction" on the advance shaft.
After adjusting, 12 inches of vacuum seemed to be the best.
