<VV> engine noise

[Mike Kost]

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