Join Date: Sep 2000
Location: Sidney, New York
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Re: weber carb does NOT like the cold
I've heard of a number of folks complain about the Weber and cold starting. My Weber starts fine, but before I fabbed up a pre-heat set up, when it came off choke, it ran really rough till it warmed up and this could take quite some time. The pre-heat setup consists of 1 1/2" preheat tube, the heat riser fitting that came with the header (speed shops probably have these), and a shop vac utillity nozzle (1 1/4"). It's a pretty basic setup. Clamp the heat riser fitting to the header tube, run the pre-heat tube any way you desire to the air filter. The utillity nozzle will have to be modified to connect to the air filter. I used #6 machine screws to the air filter top lip. Because of the angle of the nozzle, it will not sit correctly because it interferes with the front of the carb. I drilled an hole maybe an inch or so in diameter in the neck of the nozzle to provide clearance. As it sits, it no only provides warm air through the filter, but also warms the fuel inlet. I had to cut down the nozzle as it was too long and cap the ends.
The set up dramatically decreased the warm up time needed to maintain proper idle speed. I should note that I never had a problem with power from the Weber. It was only when cold and coming back to idle that it ran like a dog. The pre-heat setup cut the warm up time by 1/2 to 3/4 of what it was before.
The nice part about this mod is that it is a real cheap one to do. I'm looking for another hot air collector to replace the nozzle that I'm using now to improve it's efficency. Hope this helps....
All Good Medicine,
Creator, everything we do leaves a track. May our tracks be ones we would want you to see and others to follow......