Ken Streeter <streeter@sanders.com> writes:
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I use Champion RN-9YC in my 70 TR6, and Champion RN-12YC in
my 1974 TR6. The RN12YC is a hotter plug. From what I have
been able to find in various literature, this is the factory-
suggested configuration:
Champion N9Y -- 1969-1972
N12Y -- 1973-1976
Feel free to substitute your favorite brand of plug (NGK,
Splitfire, whatever).
I don't honestly know why the lower compression engines want
the hotter plug. Maybe somebody else out there that knows
can explain...
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They probably use a hotter plug because they can, lower compression
ratio and all that. Also, they probably switched when they realized
that the MGB uses N9Y's. ;-)
Dave Massey
St. Louis, MO
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