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HelicopterEngines Plugs Mufflers Fuel › Align 91 Nonpumped temps?
06-03-2010 06:48 PM  7 years agoPost 1
dashpilot

rrApprentice

Abu Dhabi, UAE

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Just got my first Align 700 LE with the align 91NP eng and stock pipe. What is a good temperature for the case and head? I know how to check the temp via 5 sec on the case but would like more definitive numbers if they are out there..

thanks..

"what comes up must come down"....softly of course

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06-03-2010 09:34 PM  7 years agoPost 2
Santiago P

rrProfessor

South West, Ohio

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Engine Temps are depend on may factors, mainly what is the ambient temperature and how hard you work the engine/sticks. If one just strolls around on a 90F day, you can see temperatures on the back plate of 105F and the back side of the head (bottom of heli) of around 225-230F
If you work it hard, you need to open the needles to not exceed those numbers. You can run cooler, but you may be trowing a bit of fuel away. I prefer the later rather than to squeeze every bit of power.

Some 30% fuels run hotter than other 30% fuels and that is normal. Oil formulation and viscosities attribute the diferences.

On a cooler day you will see 5 to 10 degrees less on the head.

Take this info with a grain of salt and always pay good attention to the engine exhaust note and how smooth the engine runs.

Beware
The OS/ALign 91 HZ CAN run smooth while lean and be slowly desintegrating without you noticing. No engine ever self destructs running on the rich side of tunning.

Good luck

Santiago

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06-03-2010 11:24 PM  7 years agoPost 3
dashpilot

rrApprentice

Abu Dhabi, UAE

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Appreciate the response. I am living in Abu Dhabi right now with temperatures running in the 100 F so i'll give her a test in the next day or so and see what happens...

Mike

"what comes up must come down"....softly of course

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HelicopterEngines Plugs Mufflers Fuel › Align 91 Nonpumped temps?
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