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HomeAircraftHelicopterHIROBOOther › optimum head speed for freya 91 os engine
02-07-2008 10:33 AM  10 years agoPost 1
wild1957

rrApprentice

Malaysia

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Hi Guys, Can anyone tell me what is the best head speed for the Freya running an OS 91 SX with pump engine fitted with the Viper head? Also can anyone tell me what is the optimum running temp of this engine when tuned properly?

Stephen

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