acceleration problem
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Joined: Jul 2008
Posts: 59
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From: VA
acceleration problem
About a year and half ago I replaced the manifold on my 350 with an edelbrock airgap. At the same time I had my Holley D.P.'r rebuilt. The car would hesitate, chug, sound like it was flooding and be ready to die, and then would take off. I initially thought it was a bad rebuild on the carb. Last Oct, I dropped a crate ZZ383 into my 64, with new Holley 750, new fuel pump, etc. Put on the Edelbrock airgap on the engine. It still runs very rough at low rpm's. It lags, thinks about it, and then takes off like a raped ape. Dropped the clutch last week and put the pedal to the floor, and the car almost died. The airgap is the only thing that came with the new engine. Any thoughts?
Bill
Bill
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Joined: Dec 2008
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64 RDSTR,
Sounds like you may have a couple things going on. The idle ports directly beneath your throttle blades may be uncovered too much. They should look like a little "square" about maybe .020"-.030" uncovered. Also sounds like you may have too much play in your accelerator pump arm...you should get fuel out of your squirters as soon as the throttle is moved. Also sounds like you may need bigger squirters, what is your current size?
Have you dialed in your mixture screws at idle to give your best vacuum reading? And a biggie...what is your intial timing?
What is the duration of your cam at .050"?
Jim
Sounds like you may have a couple things going on. The idle ports directly beneath your throttle blades may be uncovered too much. They should look like a little "square" about maybe .020"-.030" uncovered. Also sounds like you may have too much play in your accelerator pump arm...you should get fuel out of your squirters as soon as the throttle is moved. Also sounds like you may need bigger squirters, what is your current size?
Have you dialed in your mixture screws at idle to give your best vacuum reading? And a biggie...what is your intial timing?
What is the duration of your cam at .050"?
Jim
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Joined: Jul 2008
Posts: 59
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From: VA
Jim,
Thanks for the info. After doing some more research last night, I found several sites with folks complaining of just about the same thing I am experiencing. I forgot to mention that I put on a MSD ignition and distributor when I did all of the engine mods. I think I am getting immediate response when I give it gas, but there is a "bog" just about everytime I do so. Runs really rough at low rpms, but if I feather it, and run up the rpm it seems to do OK. Also, when running about 2600 rpm at about 32 mph, it will lurch or miss every 30 secs or so. If I had to guess, you are right, there are multiple issues, and I think I just need to dial in everything correctly. Anybody know of any engine gurus in the KC area?
Bill
Thanks for the info. After doing some more research last night, I found several sites with folks complaining of just about the same thing I am experiencing. I forgot to mention that I put on a MSD ignition and distributor when I did all of the engine mods. I think I am getting immediate response when I give it gas, but there is a "bog" just about everytime I do so. Runs really rough at low rpms, but if I feather it, and run up the rpm it seems to do OK. Also, when running about 2600 rpm at about 32 mph, it will lurch or miss every 30 secs or so. If I had to guess, you are right, there are multiple issues, and I think I just need to dial in everything correctly. Anybody know of any engine gurus in the KC area?
Bill
