Re: thumping in rear end of UrQ

[quk@isham-research.demon.co.uk (Phil Payne)]

Michael Williams wrote:
>
> hey all, im worried now.  I was just driving my UrQ home, and took a few
> turns spiritedly when i noticed that something was thumping
> intermittently.  Well, i thought it might be the exhaust or something,
> but then it became regular very quickly.  When i pulled onto my street i
> turned off the car and let it coast to a stop, it was there, a
> thump-thump-thump, not over bumps, but consistently, with the delay
> lengthening as the speed dropped.  It didnt seem to change much when i
> put on the brakes that i can remember.

I remembered something else this might be - differential exhaust
cooling.

At one time, it used to happen to mine.  You need cold rain or slush
on the road - the way the airflow under the car works leads to one side
of the centre exhaust section being cooled more than the other, and the
exhaust twists into the prop shaft.  If you let it cool down, the
problem goes away.  Symptom is a bright spot on top of the exhaust
pipe - fix is to re-align the exhaust.

--
 Phil Payne
 Phone: 0385 302803   Fax: 01536 723021
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