Inliners International Forums General Discussion Engines Setting Up Offy 2x Carbs.

posted 11-07-2004 05:09 PM
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Well; I finally installed my Offy 2x intake and Fenton headers. This will be my first attempt at setting up multiple carbs. So far, it's not right.

The exhaust isn't installed yet. I had 18" pipes made and they're on it.

No matter where I adjust the air/fuel mixture, it only runs when the choke is closed on one of the carbs. It seems like it has a vacuum leak somewhere; doesn't it? I have a vacuum line going from the vacuum advance on the distributor to the second carburetor (near the firewall). That's the same carb that has the choke connected. The vacuum on the other carb is blocked. I've also blocked the vacuum hole on the face of the intake.

What are your ideas for solving this problem?

Thanks.

a Nice safe way to check for Vacum leaks is to use some soapy water. anther one to use is carb cleaner. Hope this helps.}[oooooo]

Ps check the carb bases Intake to head and and All fittings

Jerry,If it's not a vacuum leak remove one carb at a time, block off the open intake and run the engine on one carb adjusting to the idle that you are trying to obtain.Then repeat the process with the opposing carb. That will put them close together in adjustment.Mount them both and adjust from there with your linkage and mixture screws.

Jerry, I had the same problem when I installed my Offey intake and Fenton headers. The problem is the intake and the header do not fit together. The header holds the intake off the gasket at the bottom or underside of the head causing a vacuum leak. I found it nessary to grind on the underside of the intake to allow clearance for the header. It's a spookey deal but it worked. Just go slow on the grineing and you will be ok. If you pull your intake and header off you will see where they an hitting together. That is where the grinding is nessary. Then you will be able to adjust the carbs.

A buddy of mine fought with his set up couldn't get it to run, rebuilt the carbs tweaked and adjusted for a week. I showed up and persuaded him to put away the.45 and not put a hole in the motor. As I slid my hand under the intake, the vacuum sucked my hand to the manifold and the car was running like a Swiss watch. One of the bolt holes on the bottom side of the 2x1 intake was wide open to the intake, a bolt in the hole solved the problem.