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HelicopterEngines Plugs Mufflers Fuel › inconsitant runs with 0s 91 c-spec ps
10-19-2004 12:38 AM  13 years agoPost 1
osenginesrock

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hey, have an os 91 c-spec ps in my raptor 90 se the first day it ran fine, about 65 degrees out and ran about 180 degrees, the second day about 60 degrees, was running well, but sluggish during flips, only running about 150, leaned it out two clicks and ran good, anyone know why this would happen, main needle about 1.2 turns out. Running cool power 30%, mp2 and 8.27 gear ratio, and 1800 on the head with throttle jockey, any thoughts

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10-19-2004 12:43 AM  13 years agoPost 2
Comanche Man

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humidity?

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10-19-2004 05:05 AM  13 years agoPost 3
osenginesrock

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no one can help me

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10-19-2004 05:20 AM  13 years agoPost 4
Bushy

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Is the engine broken in?

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10-19-2004 09:58 PM  13 years agoPost 5
Comanche Man

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yeah, he has had that engine for a while.

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10-21-2004 12:08 AM  13 years agoPost 6
osenginesrock

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yeah, it has been run in for about a gallon rich, and now leaned, disapointed that no one can help me though

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10-21-2004 09:24 AM  13 years agoPost 7
cjw

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Obviously check all your fuel lines, especially the clunk line.

I had the same problem with my OS91 though after a while. Some days it would run fine, other days it was a right pain and couldn't pin down the reason. In the end changed to a YS

Hope you have better luck.

Clive

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10-21-2004 06:12 PM  13 years agoPost 8
osenginesrock

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I don't think it is the fuel lines, since I have only ran a gallon and a half through the thing and the lines were all new when I put them in there. Cleaned out the carb, hope this will fix it, any other suggestions?

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10-26-2004 05:02 AM  13 years agoPost 9
challenger

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Are you using a Perry pump

My fury Xtrm is relatively new about 2~4 gallons through it. And I had a similar problem, with inconsistant runs from day to day. I had several unplanned auto's due to engine stalls. I tried the CY mod. ( stretching the spring), but no luck.

I disconnected the pump, and went back to a exhuast pressure on the Mp 2. I also use 20% nitro and re-set the carb to 2 turns and worked my way back to the best setting.
It has been running great ever since, without the pump. Every engine is slightly different, that's why some engines require a pump and some don't.

Thanks,
Al

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10-26-2004 01:40 PM  13 years agoPost 10
Kenna

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I don' know i you are awere, but probably, you should still have muffler pressure even with a the pump on the OS91PS

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10-26-2004 05:56 PM  13 years agoPost 11
osenginesrock

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hey, the back plate of the os 91 c-spec ps has a pressure nipple, could I just use this to pressurize the fuel system, or do I need a regulator, and If so, were can I get one, can I get a kline regulator seperate, or would I have to get the whole carburator?

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10-26-2004 07:20 PM  13 years agoPost 12
Colibri

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The Netherlands

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Yes you can use it but I'm not sure it will work without a fuel regulator like a Cline or Iron Bay and a one way valve.

Here is some info on the cline regulator and the Iron Bay one

Tim

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10-26-2004 09:30 PM  13 years agoPost 13
osenginesrock

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okay, I think I migth do one of those two. Now my question is, which one, I know that people have had good results with the kline regulator, however I haven't heard as much about the iron bay one.

Do I have to retune the engine?

How do I mount it, on the engine, on some other part of the heli and how?

Do I need any particular type of fuel line for the pressure line, anything about that fuel line, zipties neccesary?

This will solve pretty much most inconsistancy with the engine?

What do I need to know before I install/get one?

Anything that I have missed?

I'm anti-donkey

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10-26-2004 09:32 PM  13 years agoPost 14
osenginesrock

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With one of those two, which one is better, and if so, will my engine now be "like a ys" meaning that I only have to tune it a little rich and then fly it throughout the entire season?

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10-26-2004 09:32 PM  13 years agoPost 15
osenginesrock

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Like subtle changes in temperature won't really affect it now?

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10-26-2004 10:05 PM  13 years agoPost 16
osenginesrock

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hey lots of questions, but that is what runryder is for, on the were do I mount it section, can I just mount it to the side of the header tank with zipties

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10-26-2004 10:05 PM  13 years agoPost 17
Colibri

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The Netherlands

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I can not tell you which to get as I haven't used either of them (yet).
Also I don't think ambient temperature changes are compensated as these devices are pressure regulators and a temperature change mostly changes the density of the air and this disturbs the mixture strength not the pressure. The mixture strength must still be set using the needles.

It should solve inconsistencies caused by a changing fuel level in the tank.

If you do a RR search on the Iron Bay regulator you'll find more info including mounting pictures. The Cline is usually mounted on the carburetor itself without even a tube between it. This is remarkable as on the maker's website it says to never mount it to the engine.

Tim

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10-26-2004 11:31 PM  13 years agoPost 18
osenginesrock

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were can I get one, onlinestore, you guys

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10-27-2004 01:04 AM  13 years agoPost 19
osenginesrock

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so basically with one of these, you would get the power boost of the os engine, and the consistancy of the ys engine, sounds like a good deal to me kinda like a yos engine

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