Subject: Re: Strange Ruff Running Engine Quiz-- SOLVED!
> Thanks to all who offered suggestions, but Congratulations go to Paul Hunt
> who solved the problem!
>
> Paul said " If the tach was erratic then that indicates a problem in the
> ignition LT"
> Correct! I initially thought maybe a defective ignition switch(often
> overlooked), or capacitor, but these would affect all cylinders. Then I
> looked for cracks, arcing paths, in the dist. cap., but none found.
> Paul then says "problem inside the dizzie. Very small gap and a bit of
> imbalance in the dizzie cam lobes or shaft wobble" Well said and
absolutely
> correct! Finally,I checked what I should have in the beginning and as
Paul
> figured, the point gap was virtually imperceptible. While the dizzy is
new
> with no shaft wear, still there exists a very small difference in the cam
> lobes rotation reach. Apparently, number three and four opened just
enough
> to break point contact. As to why the problem appeared after warm up I
can
> only guess it has to do with metal expansion. Also, after re-starting,
just
> don't know.
> So why did points with only 700 miles on them slowly close? Maybe because
> the installer didn't tighten the screw sufficiently, but I'd rather not
talk
> about it.:->
> This sure points out the ability of these engines to run on just about any
> point gap though!
> Mike Winney
> '68 BGT---now running on all four
///
/// mgs@autox.team.net mailing list
/// or try http://www.team.net/cgi-bin/majorcool
///
|