bigmanjbmopar
Newb with a view
I have a Holley 750 DP and was able to get rid of the surge by increasing the shooters size from 30 to 35 and replacing the throttle cam. fixxed a lot of out the box issues with the Holley. Good luck.
My dist doesn’t have a vac advance.Try hooking up ur vac.advance & go for a roadtest.
I have a Holley 750 DP and was able to get rid of the surge by increasing the shooters size from 30 to 35 and replacing the throttle cam. fixxed a lot of out the box issues with the Holley. Good luck.
Timing play with your timingMy dist doesn’t have a vac advance.
Do you know if you were experiencing a lean surge or something else? My situation is not a lean surge. I’m getting the surge at rich AF levels, 11-11.7.
Anyone know if there is a rich surge?
Thanks for the options guys. I will play with the timing this weekend. As an update, I installed a fuel regulator and that didn’t help. I moved my magnetic pickup wire from the 6AL to the dist away from any potential noise sources and that didn’t change anything. It is shielded and grounded anyway so I wasn’t expecting much.
Timing is easy enough to mess with m, and free to change, so I will jump on that and report back.
During the dyno testing my engine liked 32 degrees total best. Produced the most power and ran the smoothest. On the MSD distributor I am using the black shin which gives me the least amount of timing add, 18 degrees. This minus the 32 total sets my initia at 14. There is no other shin that will allow me to raise my initial and keep all in at 32.
So if I raise my initial I raise my total and I already know that the engine will lose power doing that.
Based on 15 dyno runs my engine likes 32 best. Which is what I have it set for. See above.
I’m not going lean. I have an a/f gauge and it says I’m usually rich, sometimes perfect, never lean.
Sorry for the delay guys. Started a new job and finally found the time to hack at this problem.
1. Got in on the timing. For some reason it was at 0. advanced it to 14, which is where I thought it was originally and nothing changed. Advanced it to 18 and nothing changed. I could try 20 but I doubt anything will change.
2. Purchased a new coil, MSD blaster 2 high vibration, no change
3. Replaced my MSD distributor with a used OEM distributor I found on CL. No change.
Now I am down to either the MSD 6AL Digital box as the culprit or the plug wires or plugs. That is if the ignition system is the issue. Plugs and wires are new.
Here is another symptom, I was idling down a hill in 3rd gear, about 1200 rpm, slow and the car just starts bucking rather violently. Same pattern as what I feel under low power low RPM.
I'm not convinced at this point that its ignition system. This MSD box was on the car prior to swapping in the 440. I never moved from its location so the chances of something happening to it are slim.