Carb issue ???

I've just completed all my swapping and got the JEEP going again. I'm running a Rochester 2G on a 231. This is the same carb I had on my 225. The problem begins at 3000 rpm in high gear. At 3000 rpm my engine falls on it's face. Until that point it is fine. I took the carb off and cleaned up the needle and seat thinking that a piece of dirt had gotten in the seat. This did nothing for my problem. The only think I can come up with is that this engine needs more fuel than my 225 and I need new jets in my carb. The fuel pump is nearly new, and the fuel filter is new. I have even cleaned out my fuel tank in the engine swap process. Anybody have an idea? Thanks

 

Does the rochester havea power valve circuit? That could be a possible culprit.

Also, are you using straight manifold vaccuum for your ignition advance, or a ported/timed vaccuum off the carb? If your advance was set up wrong, that could mess with the timing and give you a flat spot.

 

I don't have it in front of me but there is no power valve circuit that I'm aware of. As for the vaccuum it comes off the carb. We set the advance per Chiltons instrustions. I am thinking it was 5* or something like that (its been a few weeks)h. Should it be different?

 

That mill needs fuel at upper RPMs Todd from what I recall. It ran sweet with a 4 bbrl.
Then again I was wrong about a few other things with it.

 

Hook up a fuel pressure gauge to it and see if it is dropping at high RPMs.

 

If all fails then ya know.....:v6::smash:dead horse






R)

 

I haven't checked for a vaccuum leak yet. I know it has quite a bit more power than the old engine but surely not enough to need that much more fuel? I'll have to check the vaccuum first. I know that was quite a monkeys for you Sparky.

 

I only had one big come apart during the whole process Jerry. (You can throw a high lift jack a long way if you get mad enough.) From what people tell me anyhow.

 

It's not stock if that matters.
Can you change jet size like on a Carter?

 

If it isn't a vaccuum problem, I might try bigger jets. I do agree, it should be plenty of fuel.

 

Well your static idle advance and yor distributor advance curve are different. The distributor increases the advance as RPM's increase. Actually to further complicated the matter most dist's have both a vaccuum advance and a centrifigual advance that effect your overall advance at any given RPM and manifold vacuum.

When you set your timing, did you disconnect and plug your vacuum line to the dizzy?

You could try to pull and plug the vaccuum line to the dist, and then drive the jeep arounda bit. If it drives better, you need to adjust your vacuum advance.

 

R) Was that before or after it got dropped?

 

Make that 2 come aparts. I forgot R)

 

R)

Some body asked me about you losing the keys at LBL but I can't recall who it was.
That was funny. monkeys

 

honestly I don't even remember that. They were prob in another pocket or something. No wait, you guys took them didnt you?

 

Who us? :?
I'm shocked.
Yea we put them on the antenna. R)