I've been using a vacuum gauge for many years.
Nothing I have found works as well for so
Rick Lindsay wrote:
> Menno writes,
> > Dear List,
> > <SNIP>
> + I tune with a vacuum gauge attached to the intake
> manifold (not the vacuum advance port on the carb
> as that is a modulated vacuum). This is an idle-only
> setting but as discussed above, that setting influences
> the whole curve. Maximum vacuum occurs when the
> engine is running at its highest volumetric and combustion
> efficiency. That is also what you are tuning to achieve.
> It then follows that the goal is the set the mixture, keeping
> the idle speed fixed, that produces the highest manifold
> vacuum. Cheap gauge to buy, excellent technique to
> As an aside, the vacuum gauge can also spot a plethora
> of other engine problems like sticking valves, broken rings
> and ill-sealing valve seats. Give it a try. Its a cheap test.
> I hope my rants in some way, help.
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