Project "Payback"

[GregWeld]

That's so good to hear!! It's so much work - and so much expense - to not have it come out smokin' hot! Love it!


Re: Driveability -- could it be the pump shot is not fat enough - rather than the primary side? The speed at which it should wind up - might be too fast for the pump shot (as is) to catch up to... Just a thought.

[Vegas69]

Originally Posted by GregWeld

That's so good to hear!! It's so much work - and so much expense - to not have it come out smokin' hot! Love it!


Re: Driveability -- could it be the pump shot is not fat enough - rather than the primary side? The speed at which it should wind up - might be too fast for the pump shot (as is) to catch up to... Just a thought.

It's definitely on the primary side since it's only 1/4 throttle. It's got roughly 10hg at idle. It had a 4.5 PV in it since the old engine made 7-8hg at idle. I put a 7.5 in it and it didn't seem to help. Then I increased the primary squirter from 32 to 37 and it really helped. Going to a 40 didn't make much difference. I think the primary main jets are just a little to lean and and the squirter is actually to big just covering up part of the problem. I'm going to try 4 jet sizes up on the primary side and see if it helps. It's weird AED specs teh 850 HO with 8 jet sizes stagger betweent the primary and secondary bowl. We dropped the jet's 7 sizes on the dyno to make peak power but now I'm thinking with the extra efficiency and vaccum it want' larger primary jets. That carb was spec'd for the old engine builder and the crap he builds. If that doesn't work then I'll throw the thing in the garbage and call Patrick at Pro Systems. I've already changed the metering blocks as well. Fuel injection would be easier than tuning this thing by ear. I was going to put a Air/Fuel gauge in the car but couldn't package it in the dash. That would've helped.