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HelicopterEngines Plugs Mufflers Fuel › O.S. 55 HZ-R tuning challenges
11-28-2011 11:02 PM  5 years agoPost 1
raybans

rrApprentice

Northern Ireland

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Hi,

I'd be very grateful for some help tunning this engine. Its installed in an FBL Fury 55 with zimmerman muffler.

I've been running it quite rich during the first half-dozen tanks - it never idled well but i disregarded that as all i was concerned about was running it rich initally.

Over the last few Saturday's i've tried to lean it out a little and try and set it so that it idles nicely. But the latter has eluded me. I land, it idles ok for a while (say 10 - 15 seconds) then seems to 'choke' to halt. Unburnt fuel drips out of the exhaust which seems to confirm the 'too rich' theory.

There appears to be plenty of pressure in the fuel tank (it bulges!) so that suggests the one-way valve is installed correctly and functioning as intended.

I am using optifuel 20 percent nitro.

There is a good seal between the muffler and the engine (its totally dry - using high temp RTV). I am using an O.S. 8 plug.

I have tried tweaking the needles following the adjustment procedure in the manual -
1. high speed needle - to set the basic mixture. Needle is a 1 turn (factory is 2 turns).
2. Left the mid needle alone - 0.75 turns (factory is 1 turn)
3. Adjusted the idle towards lean to try and stop it stalling. Almost closed!

Basically i do not know what to do different.

Any advice greatly appreciated.

Thanks.

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11-30-2011 07:17 AM  5 years agoPost 2
Bugcatcher

rrApprentice

Perth, Australia

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I would check the needle in the regulator for any dirt. It only needs a small amount on there and it won't seal causing the engine to run rich.

I have had this on both my 55HZ-R and 91HZ-R 3D. Fuel started pouring out of the carby on my 91, once I cleaned the reg everthing was fine. Be careful when you clean it that u use compressed air to dry it as using a cloth may leave small fibres giving you the same problem as before.

I have my needles at around 1.5 main and 0.75 for mid.

The 55HZ used to frame out constantly and could never get a consistant tune until I cleaned the reg.

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11-30-2011 09:36 AM  5 years agoPost 3
raybans

rrApprentice

Northern Ireland

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Thanks.

I will try that - never had the regulator apart before.

What cleaning agent did you use?

Thanks.

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12-20-2011 03:54 AM  5 years agoPost 4
raybans

rrApprentice

Northern Ireland

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Got some quality assistance from ripmax.

They told me to turn the high needle back to only 3/8 of a turn and turn the idle needle back to the stop position if need be.

I would have thought these needle settings would have cooked the engine but it appears not. Good news is that engine now idles nicely.

Thanks to ripmax.

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12-20-2011 04:59 AM  5 years agoPost 5
CX1

rrKey Veteran

Canada

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There appears to be plenty of pressure in the fuel tank (it bulges!) so that suggests the one-way valve is installed correctly and functioning as intended.
would to high of a tank pressure cause it to choke at idle

" Team Protoast "

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12-20-2011 01:24 PM  5 years agoPost 6
Dr.Ben

rrMaster

Richmond, VA, USA

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No. The properly functioning reg meters the fuel being driven by that pressure head.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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12-20-2011 03:40 PM  5 years agoPost 7
raybans

rrApprentice

Northern Ireland

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Thanks Ben.

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