<VV> engine noise

[Ron]

Some years back I had a piston get a mark like that.  I left it in and it's 
still running, maybe five years later.
RonH

----- Original Message ----- 
From: "Lonny Clark" <lclarkpdx at gmail.com>
To: "Mike Kost" <vairmike at sbcglobal.net>
Cc: <VirtualVairs at corvair.org>
Sent: Monday, September 11, 2006 6:00 PM
Subject: Re: <VV> engine noise


> 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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>
>
>
> -- 
> The sooner you fall behind, the more time you'll have to catch up.
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