From: Matthew Walker <walkerm@prl.philips.co.uk>
Subject: Weber Carbs
Does anybody know if you should worry about calibrating the
accelerator pump jets in a 45 DCOE ? I know the pump jets
allow some fuel to re-enter the float chamber, preventing
too much fuel going into the engine when accelerating.
. I think calibrating the pump jets
should give better driveability - right ?
I would look into other things first. The choke (the narrowest point in the
carbuerator throat) is adjustable, with smaller sizes=better low-end drivability
and larger sizes=high-end power. Sizes are visible from the intake side of the
carb, stamped on the bottom of the choke. Also worth messing with are the
air corrector jets (larger=lean out mixture at top end) main fuel jets (larger=
richer, esp. at bottom end) and so on. The best advice I can give is to find
yourself a copy of the Haynes Weber book, it's a damn fine guide. It seems to
me that the pump jets will only affect the acceleration phase, with little or
no effect elsewhere. And I believe that the pump jet itself is seperate from
the pump return circuit (dumps fuel back into the float bowl).
Anyway, look for a copy of that book, and write me back if you want to discuss
this further. I, too, am in the process of making a 45 DCOE work...it, like
the car in general, is never, ever finished.
Peace+warm dark beer to all,
Matt (matt@raptor.sccs.swarthmore.edu) 1970 MGB
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