| Ignition Timing Question [message #254465] |
Sat, 05 July 2014 19:01  |
Jon payne
Messages: 495
Registered: May 2008
Karma:
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Senior Member |
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Guys,
I recall this past winter a discussion about how to "properly" set the ignition timing. It was discussed if following the GMC MM you may have have some mechanical advance being that the MM ask to set the timing at 1100 RPM and to to see if this is happening check the timing at a lower RPM. Well I just did this and found that the timing was only 2deg at ~550 RPM (Vacuum advanced removed and plugged). As soon as I touched the throttle the the timing would advanced. So I slowly increased RPM until I reached 8degs, which was 1100 RPM where I have previously set per MM).
So based on this previous discussing I have 6deg less timing and I should. Do I understand this correctly? If so looks like I need to advanced the timing to 8deg at the lowest RPM possible, correct?
Note that I have a Dick P distributor and I suppose the springs on the counter weight are lighter then the OEM. Could explain why I have been thinking the GMC has lost power some years back (could be when I installed the Dick P distributor).
Please would appreciate if you guys could validate the above and confirm if I should set the timing to 8deg (or higher) at as low of RPM possible.
P.S. As you can see I got the GMC back up and running! Got the tanks out and fuel pump fixed, brakes fixed and so on. Don't have time now but I will share what I found and provide some pics.....and thanks again for the moral support the other day!!
Jon
Jon Payne
76 Palm Beach
Westfield,IN
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