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HelicopterEngines Plugs Mufflers Fuel › os 91 sx-h c spec ps
06-02-2010 11:06 PM  7 years agoPost 1
holzback

rrKey Veteran

noblesville IN United States

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had a couple questions, i have a c spec ps with the 60m carb and the third needle that regulates the return fuel. it also has the sz head. it is in great shape and has loads of compression. how should this combo run? i was also wondering what design feature makes this motor produce its max power 1000 rpm less than the latter modles. also as far as power, dose it compare to the sz series. thanks

you aint crashin you aint learnin

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06-03-2010 12:14 AM  7 years agoPost 2
Dr.Ben

rrMaster

Richmond, VA, USA

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The engine iteslf is fine, but the pump and carb can be VERY, VERY challenging to tune. The set up will typically try to run lean in the midrange when the high speed needle is correctly set. You can improve matters by replacing the carb's metering slot ("cat's eye") with the one from the 60K carb, but that's a band aid at best. Guys have typically only achieved statifatory results from this engine longterm by replacing the carb with at the very least one from the non PS C-Spec or, much batter, the Cline/OMI carb set up. They can be had for good prices second hand here on RR if you watch closely. Also note that this engine is UTTERLY INTOLERANT of ANY lean runs, not a good feature when the stock PS carb is notorious for letting the engine go lean.

The peak power band rpm of the engine is less than that of the SZ because of the engine's timing. The engine is overall less powerful than an SZ as you might expect from a motor of earlier design.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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06-03-2010 02:38 AM  7 years agoPost 3
holzback

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noblesville IN United States

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ok, thanks, it also has the cats eye from the 60 k. how where do most guys run the return fuel to without making another hole in tank. also, i read that closing the mid return needle richens the afr and opening leans it. is that how it works. thanks

you aint crashin you aint learnin

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