Re: Timing and Tuning
Quote:
Originally Posted by Clarke
I'm not sure mine is working either... Everytime I have disconnected the steel line between the carb and the distributor (to set the timing), I don't notice any change in RPM like I have with other vehicles. And, when I put finger over the tube end I don't feel any change in pressure or vacuum.
It seems to run pretty good, so I don't worry about it. Maybe I should though. I'm interested in what others say.
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Hi David, and Scoutmann, I am going to stick my neck out here and guess that the carb you are using is "ported vacuum" which means there is none at idle. "Direct vacuum' usually comes from the intake manifold or the carb base. On the rochesters and holleys I have I just use direct vacuum. Then you will notice the difference when the line is disconnected.
If you have one of those vacuum type brake bleeders the vacuum advance can be tested with that.
DAC
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Doug Crawford
Rapid City, SD
1970 GMC K5 Jimmy Mom drove 30 years
1972 GMC C2500 owned since 1979
1955 GMC 100 driver-project
2006 GMC Yukon Denali---wife's truck
Hope to have a '60 GMC Suburban again someday
Last edited by GMCDAC; March 21st, 2015 at 06:32 PM.
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