Path: utzoo!utgpu!alliant.com!UUCP Reply-To: british-cars@alliant.com Errors-To: british-cars-request@alliant.com Sender: british-cars-request@alliant.com Return-Path: From: kent@wsl.dec.com Message-ID: <9002121639.AA02539@godzilla.pa.dec.com> To: british-cars@alliant.com Subject: Re: Zenith-Stromberg's, thanks References: decvax!mit-eddie!emx.utexas.edu!jatc's message of Mon, 12 Feb 90 08:47:27 -0600. Date: Mon, 12 Feb 90 11:39:21 EST Newsgroups: list.british-cars Distribution: ut Approved: devnull@gpu.utcs.toronto.edu The thing to remember about carb cleaner around Zenith carbs is not to use it to clean the carbs! That is, most cans have instructions that tell you to get all your performance back by removing the air cleaners and spraying copious amounts down the throats. On Zeniths, this does, indeed, clean a lot of the gunk off of the insides. It also rots the rubber diaphragm that separates the upper vacuum chamber from the main throttle passage. They eventually (a week, maybe) crack, which converts the carburettor from a constant depression to constant volume model: the more you open the throttle, the more air you get. You never get a larger metering bore, you never get more gas, you never accelerate past 3000 rpm. (Of course, I only read about this -- *I* would *always* clean my carbs by complete disassembly and rebuild! Yeah, right. Live and learn. :-) chris P.S. It actually says something about this in the Moss catalog, in one of their helpful sidebars. That's how I managed to diagnose the weird behaviour after the fact.