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Old 04-28-2011, 12:49 PM
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No horsepower of my 70 chevelle

I have a timing question for you guys, when checking my timing with my vacuum advance plugged off, when i rev the engine my timing mark comes up smoothly, the problem i see is when i hook up my vacuum advance and quickly rev the motor my timing drops off about 8 degrees first and then starts to advance normally, I believe this has something to do with motor dying when given full throttle from a idle, somebody have any ideas. Thanks Kamutr. P.S. I am running on manifold vacuum.

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Old 04-28-2011, 01:26 PM
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What distributor and carb are you running on it ?


Cole
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Old 04-28-2011, 01:44 PM
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Quote:
Originally Posted by kamutr
I have a timing question for you guys, when checking my timing with my vacuum advance plugged off, when i rev the engine my timing mark comes up smoothly, the problem i see is when i hook up my vacuum advance and quickly rev the motor my timing drops off about 8 degrees first and then starts to advance normally, I believe this has something to do with motor dying when given full throttle from a idle, somebody have any ideas. Thanks Kamutr. P.S. I am running on manifold vacuum.
When you open the throttle manifold vacuum drops and along with it the amount of vacuum advance. The solutions are several but probably the easiest is to plug the vacuum advance into the carb's timed port and increase the amount of base advance to compensate for the lost amount vacuum advance at idle.

Bogie
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Old 04-28-2011, 05:03 PM
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No horsepower on my 70 chevelle

I running a carter 625 and a Mallory Hei dist. with adjustable vacuum
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Old 05-01-2011, 09:13 AM
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no horsepower on my70 chevelle

Thanks Bogie, I give that a shot, also after reading up on the carter 625 according to the manual for the carter/rodchester 500-650 they don't work well with the air gap manifolds when looking for full throttle from idle when in conjuction with a moderate to big cam.
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