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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › OS91HZ-pump constantly overheating!
06-08-2009 05:08 AM  9 years agoPost 1
EagleMan!

rrApprentice

Sydney, Australia

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Hello guys,

Just thought I would share this little experience with all of you to see if anyone has any thoughts on this.

One of my good friend had an OS-91HZps in his trusty T-REX 700 for over 9 months now. Ever since he bought the heli, he has never been able to run the engine to the max.

He seems to be having lack of power during climb and engine get so hot till it is unbearable to touch. Needle settings were fine, the high end was open 1-1/2 turn or there abouts, the mid range is about 1 open and the idle screw mixture is about half.

Now, I must admit that I wasn't always present during the process of running-in the engine, however, from my 17 years of flying OS engines, I know that these engines don't go beserk easily unless you do something really stupid to it....=)

We fly in Dubai, United Arab Emirates, summer is here now and daily flying temperature is about 28 degrees C (morning), 44 degrees C (mid day) and 35 degrees C (about 4pm). We generally fly in the morning and in the afternoon. So we could say that we ran the engine with ambient temperature of 30 to about 35 degree C.

My engine (which is the 91SZ-H ps) runs fine, no worries whatsoever...settings don't have to be changed much...and ample power is constantly there. After flights, temperature of the engine is probably around 90-95 degrees in the backplate...which is about normal considering the high ambient temperature.

So, I can't figure out why this 91HZ-ps is giving a lot of trouble....

Any thoughts? Or other experience similar to this?

Appreciate it very much.

Cheers,

Eagleman!

"If it doesn't work...TRY HARDER!!"

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06-08-2009 05:13 AM  9 years agoPost 2
helirulz

rrVeteran

Singapore

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Some of the OS91SZ-PS had the same problems when run without muffler pressure. So it might be worth a shot to link up a muffler pressure line.

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06-08-2009 05:15 AM  9 years agoPost 3
EagleMan!

rrApprentice

Sydney, Australia

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Hello there,

We did have a muffler pressure on all the time.

Well, I must admit, I have not checked the way he links his fuel lines. I know that there are two ways to do it, but I just don't know which one he chose.

Thanks for the thoughts though...much appreciated.

Cheers,

"If it doesn't work...TRY HARDER!!"

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