Re: [DMCForum] Re: Exhaust Manifold Questions

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

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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