---  HUGE SNIP of a lot of neat stuff --

BTW Rolls Royce tried pure ethylene glycol back in the 30's in the Merlin
and gave up. They found that 70/30 EG/H2O mix pressurized  was better by 70

degrees

F on the cyl head temp than atmospheric pure EG. There was a "creep"

problem with

pure EG
whatever that was. This according to Major Piston Engines of WWII by Victor

Bingham

Page 116. There is that reference to cyl head metal temperature again.

Paul Lamar

Bill Freeman wrote:

  I'd assume that the head temp was high enough to cause metal creep,
probably losing
Cyl head bolt tension over time.   Not good.  I agree with Jeff - run normal
water and
glycol (eth or prop, your choice) and quite worrying about it.

Bill

Come to think about it the Merlin had these long steel studs that went from the
top of the cylinder block down into the crankcase casting. Could it be they
suffered from the same rotor housing shrinkage problem and coolant leaks we 
have when the Mazda engine is over heated? Cylinder block shrinkage in their
case. They mentioned a lot of leakage problems in the early 30's. Looks like 
Continental and Renault have made the same mistake on their aircraft diesel 
engines.
 
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