Topica Loopframe_Guzzi Archive


Subject: RE: Ambo/Eldo head compatibility

Author: Ian Adkins

Date: Mar 21, 2004, 4:12 PM

Post ID: 1716358975



Likely right Gary,

I have seen a Loop engine go from 4000 rpm to zero in about 1/3 a second.
Turns out that the engine seized because of no oil in the bike. When the
engine was torn apart the only thing that caused the seized was a small
contact patch on the main bearing that fused to the crank. Amazing forces at
play.

I am starting to think that the valve seized open.....subsequently getting
wrapped by the piston. It not only bent the valve but pushed it back. While
this was going on the excessive clearance on the rocker caused the rocker
edge to get on the edge of the cup of the push rod. Somehow the rod got bent
in the process.

OK....so what caused the seizing in the guide?

 -----Original Message-----
From: Gary Cheek [mailto:kg8-@comcast.net]
Sent: Sunday, March 21, 2004 1:22 PM
To: Loopfram-@topica.com
Subject: RE: Ambo/Eldo head compatibility


Ian , The guide siezed first . Push rods don't just "bend" where yours
was bent.We saw a lot of that stuff at Utica Cylinder head . Look back
at the posts leading up to yours.
I hope you can find a competent head shop down in Geawgeia .
Ian Adkins wrote:
 
Hey All,

Was wondering if I could bolt on my Eldo heads from my Police project
while
I repair the head from the Ambo?

Intake valve was indeed bent. Needed to hammer the thing out. From the
looks
of it the valve could have fused to the guide (since there was some
brass
tightly fixed to the valve stem) and that is what kept it
open...allowing
the piston to hit the valve and bend it. Not sure if this is the case
because the valve was closed when I pulled the head.

I'm still not sure which was first to go. The push rod bending causing
the
valve to bend (see previous email explaining my theory) or vice
versa. A
 bit
of a mystery. Possible there was a lack of flow of oil to the top end
too
but there was lots of oil up top when I initially pulled the rocker
covers.

Not sure whether to look for something else. At any rate I am happy in
some
ways because I think the damage could have been considerably worse.

Ciao...Ian



http://community.webshots.com/album/108744431PhmXQC

Not a business just a hobby

Entire thread: