NEWS PARTS JEEP & 4x4 ATV & UTV

4 barrel carb tricks

2980 Views 5 Replies 5 Participants Last post by z50k2, Mar 17, 2000

Discussion Starter · Mar 15, 2000

What is the key to making an Edelbrock 4 barrel carb work well off-road. I have a 600 cfm carb (1405), and when I am on steep inclines, at slow speeds, or stops, like when rockcrawling, the carb floods out. I have installed the "offroad kit" (spring loaded needles and seats). Has anyone had luck running this carb when rockcrawling? Right now it is on a 304, but soon will be on a 360. I imagine this will help a little, but are there any other ways to fix the flooding problem.

I was going to go with holley pro-jection (TBI) and just be done with the carb problems, but I figure I will try and give the carb. one last shot. Any and all help is greatly appreciated. Thanks

Jesse

Save

1 - 6 of 6 Posts

116

· #2 · Mar 16, 2000

If you haven't figured it out yet the measurements for float setting that they give you with the off-road needle kit is WRONG WRONG REALLY WRONG. Call them and they may tell you themselves. You have to play with the floats to get it correct.

Save

Smokngun

· #3 · Mar 16, 2000

The carb will also flood out on steep inclines (or under really hard acceleration) because the float bowl vents are really low on a carter AFB/Edelbrock carb. Under these circumstances fuel from the float bowl will wash into the venturi. I dont know if there are extentions available for them, but it is something to check.

Mike H.
1983 CJ-7 Laredo
1999 Dakota 4x4
/wwwthreads_images/icons/cool.gifo[[[[o

See less See more

Save

046

· #4 · Mar 16, 2000

If you can afford the fuel injection, by all means it is a superior way to get fuel to the cylinders. I'm running the edelbrock 600 and it's true that the stock float recommendations for the off-road kit are wrong. I've had good luck running the float level at around 7/16 with the drop right at 1 1/4. Coupled with a fuel regulator (that you can pick up at Autozone/Napa for about 15 bucks) set at around 1 or 2 lbs when off-road. Also, the lower overall gearing you have the better. It allows you to run at a higher rpm without actually going anywhere. I incorporated a bike shifter for this with both a gear shifter and a brake lever. This way I can punch up the rpm by a couple hundred with the gear shifter and still use the lever for some quick throttle.

Nuke the unborn gay whales for Jesus

See less See more

Save

120

· #5 · Mar 17, 2000

Here is some info I got off the old board....

Im running an Edelb. 600 cfm on my 304. I've had good success with the off-road kit installed, leaned out to .098 main/073 x 052 rod and two stages lean in the secondaries (.089). I also installed a fuel regulator that I run between 2 and 5 psi. This same setup worked well for a friends Scout 345 cid. If you're still having problems try swapping step-up springs. A free flow air filter also helps.

'79 CJ-7

Save

z50k2

· #6 · Mar 17, 2000

I just got an e-mail from Holley.They suggested 4 1/2 to 5 psi on the fuel pressure. I forgot to ask if you can regulate a mechanical pump or just an electric pump.Does anyone know this? Thanks

Ricky...seeya...
1979 CJ-7 401 T18

Save

1 - 6 of 6 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.

Top Contributors this Month