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HelicopterMain Discussion › Align 91H Engine - Trex700N
09-06-2009 01:22 PM  8 years agoPost 1
Saksaa

rrNovice

Sarawak, Malaysia

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Appreciate if anyone has experienced my problem with Align 91H engine which is mounted on my Trex700N.
I am always unable to turn the engine when I want to start the engine(despite using a 90 size starter and bettery is full). So, I had to unscrew the glow plug and blow out the air in order to be able to turn it with the starter. However, whenever I land and stop the engine after a few minutes of flight, I face the same problem again and I have to unscrew the plug again. It's very annoying and disturbing and may wear dwon and damage the glow plug thread. Can anyone advise as to how to solve this problem or avoid the problem.
Thanks a million.

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09-06-2009 01:41 PM  8 years agoPost 2
jsenicka

rrProfessor

Eagle River, WI

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a "90 size" starter is a bit of marketing.
I use a Sullivan Dynatron on 24v to turn my 90's.
Try running your starter on higher voltage, like 18 or 24 volts

Jim Senicka
Team Manager, GrandRC Flight Team

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09-06-2009 01:47 PM  8 years agoPost 3
ShankBones

rrApprentice

La Quinta, CA USA

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I guess that could mean a good thing, that you have good compression.

I usually only experience this issue on new engines that get hydro locked by too rich fuel needle adjustment while breaking in.

Or I fill the tank and sometimes forget to close the carb side of the fuel hose. In that case I do have to remove the glow plug.

For the most part I try to hand crank the engine so the piston is in the open position of the exhaust port and lay the copter on its muffler side for a minute this allow the oil/fuel to drain out the exhaust port. Oh yeah, it would be a good idea to place a towel on the pipe so you don't scratch in on the bench.

I then try cranking start it while on its side to release the hydro lock. Then you can proceed your normal starting procedure.

Be patient, It will all get better unless you just don't have enough voltage to the starter. All you said is your using a 90 size starter with full battery.

Good Luck

"Whats Right is Right and Whats Wrong is Not Flying"

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09-06-2009 04:10 PM  8 years agoPost 4
jschenck

rrProfessor

La Vista, NE.

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Try running your starter on higher voltage, like 18 or 24 volts
+1 higher voltage will help a lot. Run a 4S lipo for your starter.

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09-06-2009 06:54 PM  8 years agoPost 5
fflier9

rrApprentice

Wauwatosa, WI USA

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well if it's happening after a flight the hot engine may be drawing in fuel and going into hydro-lock. So a simple fuel line clamp may help solve your issues.

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09-06-2009 09:02 PM  8 years agoPost 6
QuantumPSI

rrElite Veteran

Atlanta, GA

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Without knowing the starter setup it's impossible to say if it's an engine problem (flooding) or a starter setup problem (too weak)...

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

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09-06-2009 10:11 PM  8 years agoPost 7
turbo35

rrApprentice

Southern Ohio

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+1 on the fuel line clamp .... sounds like the engine is hydo-locking with fuel.

BEAM TEAM USA

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HelicopterMain Discussion › Align 91H Engine - Trex700N
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