Re: [DMCForum] Re: Exhaust Manifold Questions
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Re: [DMCForum] Re: Exhaust Manifold Questions



A dodgy tappet will sound, well, tappety. Think striking a metal pin
with a small hammer several times per second. An exhaust manifold leak
makes the engine sound like an air cooled VW engine. Often silent at
idle, sometimes even quiet when revved in neutral, but always audible
when putting the engine under most load - eg flooring it at 2000rpm.

I sometimes use a length of hose which I hold one end to my ear and run
it around the manifold to find the leak. NB you won't hear it till
you're right on top of it, if it's the manifold gasket.

Martin

gullwingmag wrote:

> Rob
>
> While we are talking exhaust gaskets, could you describe the
> difference in sound between a exhaust leak and a valve making noise?
>
> I have a "tick" that you only hear under acceleration, doesnt change
> with engine temp, and is quiet at idle or cruising rpms.  It also
> goes away as you approach the 4K rpm range during a hard
> acceleration.  Im leaning towards a gasket leak... any thoughts...
> advice?
>
> Ron





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