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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Do i have to shim my engine?
03-31-2005 11:58 AM  13 years agoPost 1
Andreas

rrVeteran

Sweden

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Hi.
I've been using my OS91 C Spec PS for about 200 flights without any problems.
I've been using 20% nitro.
My question is, if i increase the nitro to 30%, do i have to add any shims between the head and the block or is it enough to just run a richer mixture?

Thanks /Andreas

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03-31-2005 12:22 PM  13 years agoPost 2
DOKEY

rrProfessor

Northamptonshire UK

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No need for the shim. IMO

Ryan.

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04-01-2005 02:10 PM  13 years agoPost 3
Andreas

rrVeteran

Sweden

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Thanks alot for the help guys. I'll try without shim.

Andreas

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