Chris I would suspect that little burp might be in your Dist. timing. Did
the mechanic check that?
Armand
>So, my car is back from the shop, with little improvement. This problem
>is not new, but I thought that it could eventually be tuned away. Guess
>not. My mechanic tried various different things (including changing the
>accelerator pump position), checked for leaks and such, and found no
>apparent problems with the carbs (Zenith downdraught, 36 WIP3),
>ignition, timing, or motor in general. This is a real head scratcher.
>Here's what he thinks might be contributing to the problem: as the
>carb's come from the factory, they are set so that the initial throttle
>opening (which is a function of the accel. pump, right?), is very lean.
>Upon an engine rebuild (which I think mine has had done), the cylinder
>size is typically increased, so that if the same jet as before is used,
>the mixture is now too lean, causing the 'burp' that happens with the
>initial throttle application. Does this make sense? Or is it possible
>that somewhere along the way the jets in the carb were changed? Short of
>getting a box of various sized jets and spending a few days on it, is
>there some 'easy' way to check this? As I said before, other than that
>little 'burp,' it runs great the rest of the way through the RPM range.
>Idle is fine, too. Makes a good case for fuel injection...
>
>Thanks for all the input!
>Chris
>'62 SII
ritchie(at)mcn.org
Armand & Lorie Ritchie
This archive was generated by hypermail 2b30 : Tue Sep 05 2000 - 08:59:38 CDT