RE: Dyno

[Sean B <polecat2@xxxxxxxx>]

Schuyler,

I just pulled a 440 motorhome engine out of a Winnebago.  It calls for 
the little RV12YC plugs, but had RV9YC plugs in it.  It appeared to have 
run very hot, as both exhaust manifolds were cracked.  I wonder if 
someone put those colder plugs in there to try to cool the engine down.  
I wonder if that would have worked.

Sean


sky62 wrote:
> 
so instead of the champion J 12 the book said most race engines use
> the J 9 colder plug.


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