Slight Pinging at mid acceleration.
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Logistics Pro
Joined: Jan 2001
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From: Connecticut
Slight Pinging at mid acceleration.
351 with Eddy 4-v. Put in t new Dizzy and set to maximum vacuum, but lots of pinging.
Set it to 10 BTDC (factory) and I get pinging, but not under "load" (heavy acceleration) Only at a "mid" acceleration, as when holding current speed on a hill. so I have set it to 8 BTDC ( but have not had a chance to try it).
This is using 89 octane ...
Thoughts?
Set it to 10 BTDC (factory) and I get pinging, but not under "load" (heavy acceleration) Only at a "mid" acceleration, as when holding current speed on a hill. so I have set it to 8 BTDC ( but have not had a chance to try it).
This is using 89 octane ...
Thoughts?
FTE Legend
Joined: Jul 2010
Posts: 32,875
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From: Northeast, OK
Too much vacuum advance. Check to see if yours is adjustable by sliding a very small Allen wrench into the vacuum advance port. (I don't remember what size it takes.) If yours is adjustable turn it 1 turn counter-clockwise to raise the point the advance comes in by ~1" of vacuum. Keep doing that until the pinging stops.
It is possible that you have too much advance in the mechanical part of the dizzy. But, you said it doesn't ping under hard acceleration, so probably not. Given that, you have to dial back the vacuum advance, as above.
It is possible that you have too much advance in the mechanical part of the dizzy. But, you said it doesn't ping under hard acceleration, so probably not. Given that, you have to dial back the vacuum advance, as above.
Lead Driver
Joined: Nov 2013
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If running a distributor calibrated for EGR, but with the system disabled, you are very likely to get pinging at part throttle like you've described.
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Logistics Pro
Joined: Jan 2001
Posts: 3,789
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From: Connecticut
I hope so too, as mentioned, it was only pinging at a mid acceleration as I=when holding speed on a long minor grade, More gas, it would go away, so it seems fine right now....
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FTE Legend
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Senior User
Joined: Dec 2014
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From: Buffalo
Reamer, are you measuring vacuum at the distributor line at an idle? If so and there's no vacuum, you're probably hooked up to ported vacuum. Trace the vacuum line- is it hooked up to a port on the carburetor ABOVE the throttle plates?
Fleet Mechanic
Joined: Jun 2010
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From: North Carolina
The adjustment screw can come all the way out (counterclockwise), in my experience. And if it does, it can be a problem if the screw doesn't thread back in anymore 😠.
