<VV> engine noise

[Lonny Clark]

Piston had been hit, but it didn't look like it was hit very hard. It looked
like the soot had been cleaned off of a small crescent where the valve
contacted it. How hard does it have to hit to bend the rod? If the rod is
bent, can I expect low compression on that cylinder? If so, how low? Can I
tell if this is the case without taking the engine completely apart?

On 9/11/06, Mike Kost <vairmike at sbcglobal.net> wrote:
>
> Lonny Clark wrote:
>
> > Well, I need advice again. After the Portland convention I had a problem
> > with my newly rebuilt Spyder engine. After throwing the belt, I pulled
> > into
> > a parking lot and put the belt back on. When I restarted it, it was
> > running
> > really badly and made an awful noise (knock, or clang). I did a
> > compression
> > check, one cylinder had zero compression. I posted that information to
> > the
> > list, and received the advice that I had lost a valve seat. After much
> > work
> > and procrastination, I got the engine out (needed new input shaft seal
> > anyway) , and pulled the head. Sure enough, ex. seat on #2 was popped
> > out. I
> > took the head in, had it welded up, and a new seat and valve
> > installed. It
> > cost twice the estimate, but that's a complaint, and not helpful here.
> >
> > I reinstalled the head, put the engine back in, sorted out what wires
> > went
> > where, and started the car. The good news is it runs great, fires on all
> > six, revs good. The bad news: There's still a really nasty knock or
> > clang.
> > It's rythmic, sounds like one sound per revolution. I can't tell where
> > it's
> > coming from, but sounds like it's internal. How do I find this one? Do I
> > need to rebuild the engine - again? It only has 40 miles on it.
> >
> > I'm starting to get upset at the amount of work this car has taken to
> > get to
> > this point, and I still can't drive it. (about the same feeling I got
> > last
> > year)
>
> You may have bent a rod when you lost the valve seat (BTDT). Did you
> check piston for damage?
>
> Mike Kost
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