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Lloyd,
Of course the timing is stamped on the data plate as you know.  I do
remember hearing about a timing change on Lycs but I don't remember if it
was an AD or a service bulliten that directed that change nor do I remember
which engine models were affected.  I can only guess at the final temps you
might might experience as a result of retarding the timing on your engine.
That's nearly total ignorance and not much help to you now.
As a beginning you might research the AD's on your engine and then follow up
with a complete check of the Lycoming service bulletins, service letters and
service instructions pertaining to it, as well.  Unfortunately that is
something of a less than appealing project.  Given that problem, you may
decide to visit your favorite old-timer IA who has a shop and ask him.  I
will keep you in mind and ask around.  Simply publishing these letters may
get the response you are looking for.  Thank you, Marv!
The engineer at GAMMI might be able to help you.  Have you thought of buying
GammiJectors?
I hope this gives you some direction,
Walter Dodson


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Please send your photos and drawings to marvkaye@olsusa.com.
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