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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › 0.s91hz-R nitro % ?
03-21-2015 06:18 AM  3 years agoPost 1


las vegas n.v

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folks would 30% nitro be fine out of box or do I have too use the head shim that it com's with??

03-23-2015 09:13 PM  3 years agoPost 2


St. George Utah

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I been runnin mine on 30% for four-five yrs. on 30; a great running engine!

I do a great decending funnel!

03-23-2015 09:46 PM  3 years agoPost 3

rrKey Veteran

Morgan Hill, CA. USA

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If your question is:
"If I run 30% nitro in my OS 91HZ, do I need the head shims?"
The conservative answer is "Yes, you do".

But, it will depend on many factors. Start with the shims installed and then take them out after you get it tuned up and have a few flights.

The compression is lower with the shims.
Without the shims, you are getting more compression and the higher nitro can cause a bent rod or burned piston.

No shims would be the way to run 15% nitro.

Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!

03-23-2015 11:55 PM  3 years agoPost 4


Fort Dodge .Ia

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At the elevation you are at in Las Vegas you will be fine without adding shims. It won't hurt to put one in but if I remember right from drag racing there your altitude is approx 2500 ft. Combine that with being warm there you shouldn't have any problems. Make sure you start out rich and go from there

Team Jr

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