<VV> valve seats revisited (Engine Breaking)

[Sethracer at aol.com]

_RoboMan91324 at aol.com_ (mailto:RoboMan91324 at aol.com)   writes:
 

I think  the worst case situation for quenching would be running  full  
throttle (full load) uphill with resulting overheated heads and then   
cresting 
the hill and running full throttle down the other side.   Full  engine 
braking has little to do with the dropped valve seats  but going from full  
load 
driving to low or normal load driving would  be more dangerous because 
there is actual air flow quenching going  on.  Of course, overheating the heads 
in and of itself is the root  cause.  Doc
 
So, I guess the real question is "how to best cool a Corvair engine which  
has been heated up". I guess there would be four options, along with some  
"in-betweens". You could: 1) Coast down the other side of the hill, 2) Stop 
at  the top and let the engine idle down to a lower temp, (Corvair engines 
will cool  themselves off at idle), 3) Stop at the top, turn the engine off 
and let it give  off the heat or finally 4) Haul ass down the other side and, 
with less  load, the motor will cool more slowly.
 
Questions, questions. -  Seth