Hi Larry,

    Good question! It runs on the flow of air on the intake side, while the
pressure is from the exhaust side, and enters the intake system when the
valves are at overlap. Hence the great loss of power at higher RPM'S when
the exhaust is restricted. Yet it runs ok at idle or low speed.
    But it works, .......stopped exhaust equals, no power and pressure
reading at the intake. Try it sometime, put your vacuum gauge in place and
plug the tail pipe with a rag or what ever, 2000 RPM'S and ....... pressure

Howard

> How can the engine continue to run at all if the pressure in the intake
> is greater than atmospheric?
>
> Larry A.
>
>
> Raceingcajun wrote:
>
> >    The best way to check for a stopped up exhaust/catalytic converter,
or
> >any other exhaust restriction. Is to put a vacuum gauge on your engine
and
> >run the RPM'S up to about 2000 RPM'S. If the exhaust has any restriction
at
> >all, the gauge will go from reading vacuum to reading  pressure as the
RPM'S
> >go up.
> >
> >Howard
> >
> >
> >
> >>I vote plugged up catalytic convertor.Does it overheat too,or get hotter
> >>than normal? A plugged cat can sometimes be checked by looking at the
> >>exhaust. In a normal engine the exhaust is strong and in "puffs". A
> >>
> >>
> >plugged
> >
> >
> >>convertor, in addition to the above symptoms,can show a smoldering,weak,
> >>exhaust without the puffs.Also a lack of power.
> >>
> >>
> >>
> >
> >
> >
>
>
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>