Issues with vacuum advance
09-14-2016, 07:32 PM
#31
Mopar Lover
Dont mean to dampen everyones fun.... but can we get back to the family show here with Mr. 68 Newport's basic issue...
"I dont mind if Y'all want to do your "Bird Flipping" over on my Good Morning Thread... But we shouldnt F-up this guys tread....
not that I'm the boss around here or anything... Just asking...
"I dont mind if Y'all want to do your "Bird Flipping" over on my Good Morning Thread... But we shouldnt F-up this guys tread....
not that I'm the boss around here or anything... Just asking...
09-15-2016, 04:43 AM
#32
Super Moderator
I have had a similar problem that was corrected with an adjustable vacuum pot, accurate TDC mark and timing light.
Essential to do initial, full mechanical advance and at what RPM (no vacuum attached).
Then advance vacuum attached raising RPM slowly and record numbers, Advance/RPM.
This will take any guess work out and either correct the problem or allow confidence to move on to the real problem.
This is the ONLY way to do it.
Essential to do initial, full mechanical advance and at what RPM (no vacuum attached).
Then advance vacuum attached raising RPM slowly and record numbers, Advance/RPM.
This will take any guess work out and either correct the problem or allow confidence to move on to the real problem.
This is the ONLY way to do it.
09-15-2016, 08:28 PM
#34
Yes it will. It will tell you how much the vacuum advance is responsible by disconnecting and reconnecting. Then, compare to what the shop manual recommends (I think it is something like 5 or 7.5 degrees at 15 inches). If 68N gets 15 or 20 degrees advance with the vacuum connected, then his theory of over- advancing may have merit.
09-26-2016, 02:17 PM
#36
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Hey guys sorry for being absent.. First couple weeks of back to university have kept me a little busy. As for the car I have since disconnected the vacuum advance and have been driving it like that, added an extra degree of base timing (now 8.5) to help things under load without the extra advance and it seems to like it. Didn`t seem to take away from performance anywhere else and it cruises very nicely as it should.. Very refreshing to drive a car that`s running well. I may look to try an adjustable vacuum chamber at one point but for now I am content.
Thanks everyone for the insight and help!!
Thanks everyone for the insight and help!!
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