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Home✈️Aircraft🚁HelicopterHIROBOOther › OS 90 Engine and Viper Head with Perry Pump
04-24-2009 02:38 AM  10 years ago
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wild1957

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Malaysia

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OS 90 Engine and Viper Head with Perry Pump
Hi Guys,

This may well be an already answered question and I know a can of worms to answer but I only need general advice if you can help me please. I have an Hirobo Freya running with an os90 engine fitted with the viper head and pump. I am trying to tune it but with the pump fitted where do you guys temp it from? as you can't touch the back plate in the conventional way. It has the 2 needle set up, one for rich and lean and the other for the return to tank. I would like to know what I should be looking for as an average temp and where to to take the temp from using an IR temp reader. Or maybe some indication of needle settings. I have never tuned the 2 needle engine before and I feel the heli is not tuned right at the moment. I am using cool power 30% low smoke fuel but putting out lots of smoke but if I touch the side of the cylinder just below the head it feels very hot.
I hope some one can help me please.

Stephen
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04-24-2009 02:59 AM  10 years ago
helicopterMark

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Rumson, NJ

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the cylinder will definitely feel hotter than the backplate, if there is a lot of smoke and perhaps fuel sputtering out the pipe it is probably rich, but you never know. you can temp the cylinder head itself near the glow plug, just aim your temp gun around and look for the hottest point, after a flight a well tuned engine will be around 190-220 if I recall correctly. of course the best way to tune is by ear and by flying it but when in doubt checking the temp isn't a bad idea, and of course when in doubt run a click or two richerMark Schneider
Team Heli Wholesaler; Rotor Rage; YS; Perfect Regulators
www.helimark.com
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04-24-2009 01:43 PM  10 years ago
wild1957

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Malaysia

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Many thanks for your help I am just a bit new to tuning so every little help is a big help especially on this twin needle engine. I will temp the cylinder side just below the head tomorrow. But yes the smoke is a lot and it has oil running from the exhaust during the flight.
Again thanks for your help.

Stephen
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