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Modifying a Rochester 2 barrel for off-road???



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Old 01-08-2009, 10:00 PM   #1
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Modifying a Rochester 2 barrel for off-road???

I am working on an 81 CJ that has a 360/727/D300 and one ton axles. The engine has a Rochester 2G 2 barrel from a 72 Chevy 350. The problem I have is flooding, and stumbling on bumpy trails, and the engine dies on steep rock/hill climbs .

I have adjusted the float level to make it run well while cruising around, but as soon as I take it on a bump trail it loads up and wants to die. I know this is because the needle is bouncing around and flooding the engine. My question is will an off-road needle and seat from Edelbrock work on this carb? I have the kit on order, but it won't be here until Friday. WHat else can I do to the carb to help the flooding?

A fuel starvation problem occurs when the accelerator pump cavity can't fill up with fuel when the Jeep leans to the passenger side. The fuel sloshes to the passenger side, and the accelerator pump is on the driver side of the bowl. I noticed that the slot on the pump cavity for the fuel to enter is on the front of the cavity, and it doesn't go down very far into the bowl. WHat I did to try to fix this is drill a hole in the side of the pump cavity down low to allow fuel to enter from the side instead of just the front. Follow me? With this mod, the Jeep runs fine, but I haven't tested it on inclines because I don't have the off-road needle and seat. I want to wait until that is installed. SO, my second question is what else can I do to keep fuel in the accelerator pump cavity? Also, What other mods can I do to this carb to keep it running on the trail.

Sorry so long, I need a fix by tomorrow because I want to run the trails at Bridgeport on Saturday. THANKS!
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Old 01-10-2009, 11:10 AM   #2
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The carb that is supposed to be on that motor is a motorcraft 2brl which is arguably one of the best offroad carbs. I picked one up at the pic-n-pull for $15, put a kit in it and I think it will almost run upside down. Just an idea
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Old 01-12-2009, 08:07 PM   #3
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The carb that is supposed to be on that motor is a motorcraft 2brl which is arguably one of the best offroad carbs. I picked one up at the pic-n-pull for $15, put a kit in it and I think it will almost run upside down. Just an idea
I know, but I have this and I want to try to make it work. It didn't do very well this weekend. Actually I got it running great, but after the second trail, it started acting up again. Maybe it needs another rebuild kit. Or maybe it has trash in it. I think I'll tear it all down again, and rebuild it with a new kit.
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Old 01-12-2009, 08:09 PM   #4
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sounds like trash in the seat and needle.
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