[DMCForum] Re: Exhaust Manifold Questions

["gullwingmag" <gullwing-magazine@xxxxxxxxxxxxx>]

An air cooled VW.... yeah, thats the sound, and audible under load... 
not at idle or higher rpms.  I'll give the hose trick a try.

"Dodgy" ?????

Ron

--- In DMCForum@xxxxxxxxxxxxxxx, Martin Gutkowski <martin@xxxx> wrote:
>
> 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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