[TR] TR4/Webers - that banging noise- #2

[David Lylis]

JOhn,
I had a similar situation with my TR3A with a TR4 motor.  I gave her a fresh
drink of oil and started her up and a new knocking noise joined the
cacophony of TR motor noises.  Pulling a plug wire gave the same results as
you.  I was a little bent on rebuilding the motor anyway, so I started
tearing her down.  A visitor to my garage pronounced piston slap in cylinder
#3 but I quickly learned that his ego exceeded his knowledge.  After I
stepped up to 89mm I gave the cylinders to a friend who put them in his
car!  I never found the source of the noise to my satisfaction.  I no longer
care as the car runs fine with no knock and my friend is happy as a clam not
having to buy new cylinders.  BTW I just gave one of the pistons to another
friend
who was having issues with his race car and just wanted to finish the
season.
You may never know!
David

On Fri, Aug 7, 2009 at 6:39 PM, Randall <tr3driver at ca.rr.com> wrote:

> > I don't see anything. The rod cap was torqued properly with bearings in
> > place, the valves all look fine. Push rods look straight and true. No
> > scarring or marking of any kind in the cylinder. No marks on the piston
> > head.
>
> I think this was mentioned before ... did you check first for an exhaust
> leak at #2?  That can sometimes produce a "bang bang bang" each time the
> cylinder fires.
>
> -- Randall
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