<VV> Show and Tell - Show and Ask

[Sethracer at aol.com]

Class?  CLAAASSSS!
Many of us grew up in American Elementary schools of the 50s-60s-70s. One  
of the features of those classrooms was "Show and Tell". You could bring  
something to class, salamander, bird's nest, whatever you found, and tell the  
class about how you found it, and why it was so important - or not. I 
brought a  Corvair pushrod to the Kalamazoo convention and displayed it at my 
Vendor booth.  I handed it to people and asked, "What is wrong with it?" about 
half the time,  folks got the right answer, or, at least, most of the right 
answer. Looking back  about an inch from the tip of the pushrod, you could 
find the typical  half inch of polished wear, associated with the rotating 
rod's movement  through the pushrod guide. The problem -  both ends of the 
pushrod had the  polished area. At some point in it's life, it had spent some 
time installed  backwards in an engine. This, of course deprived the rocker 
ball and rocker  arm of lubrication, since the oil was spurting out of the 
pushrod just  outside of the lifter, at the bottom of the pushrod tube. The 
tip of the  pushrod - the tip that should have been stuck down in the lifter - 
was  riding in the rocker with only a little oil to lube it. The half-inch 
at that  end of the pushrod was turned blue by the heat, probably generated 
mostly  at the rocker ball and arm. The double end pushrod makes an 
excellent learning  device.
 
Show and Ask
Yesterday, "Silicon Valley Corsa" and "Corsa - San Francisco Bay Area" had  
their annual joint picnic. No, we don't grill "joints", just meat. Ken 
Lawyer,  one of the members, brought along a piston/cylinder assembly that had 
"issues".  It is a .020 over L2206F forged piston. I am not sure how to 
describe the  damage to the piston -and the cylinder, pictures attached, but it 
looks like the  piston was hit with a Oxy-Acetylene cutting torch, just above 
and behind  the rings. It's a mess. It even cut into the cylinder. If you 
have a minute or  three, take a look at some of the pictures of the piston 
damage and see if you  can explain what happened? (This is the "Ask" part) 
Another picture shows  how the aluminum was blown into the inside of the 
piston, metal spraying. Cool  to see, unless it is your own piston, I guess. So - 
What happened?
 

 

 

 
 
 
Seth Emerson    
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