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HomeAircraftHelicopterAlignOther › ys50st dies in flight---- PROBLEM SOLVED-----to much fuel pressure
03-09-2008 07:25 PM  10 years agoPost 1
wo23dodge

rrApprentice

Omaha Ne, USA

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Would to much fuel pressure be a bad pressure valve?

I can idle a whole tank away and not have a problem but spool up and start to fly away and I begin to lose power instantly then it dies,go over to see whats up and fuel is dripping out the carb.

pretty much has to be over pressurizing?

@@@@@@@@@@@@@@@@@@@@@@@@----EDIT---@@@@@@@@@@@@@@@@@@@@@@@@@@@

Turns out I knew the problem,just didn't want to believe it I guess.

That check valve must have a 35mm piece of tubing between it and the engine,I still don't understand why a longer hose would make it do what it did but I changed it and actually flew my 600N for the first time trouble free today.

inkspot1967 happened to be in omaha this weekend and I talked to him about the problem and the longer hose,right away he said thats the problem,he also taught me a lot about setting up a heli the correct way,I had no clue how a swash tool was used,now I do and my heli is set up correctly,no trim or subtrim what so ever and it flys great (Thanks Mike)

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03-09-2008 07:43 PM  10 years agoPost 2
ThunderRobo

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Toronto, Canada

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maybe your running too rich?

Derek
Da' kid with the toyz!
"Time for some Muzak!"

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03-09-2008 08:16 PM  10 years agoPost 3
david11cap

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Madison, CT

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Maybe you have a bad check valve.

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03-09-2008 09:16 PM  10 years agoPost 4
wo23dodge

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Omaha Ne, USA

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check valve is what I am wondering,it does let the tank build up pressure but seems to be to much pressure and over powers the carb at speed.

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03-09-2008 09:26 PM  10 years agoPost 5
JuanRodriguez

rrProfessor

The Villages, Florida

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The job of the valve is to stop the pressure provided to the tank by the motor from bleeding off.... It's like a "one way" valve......

A bad valve would bleed off pressure not allowing enough pressure to build up in the tank..... that does not sound like the problem you're having..... I would look elsewhere for your troubles........

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03-09-2008 09:40 PM  10 years agoPost 6
Simmer

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Massachusetts

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Sure change that one way valve out. Its a logical choice and its EASY to replace. Why not change it? It does provide pressure. The tank is pressureized. If it were leaking or letting too much pressure to escape form the main fuel tank irs going into the carb. I had an YS for some time. YS engines run very reliably becuase it has a presurized system. When I finish up my flights I would relieve the pressure and remove the fuel from the main tank. Every time it would hiss out. That check valve is a one way valve (or the tank woulnd have any presure with the engine off, yet I hear is hissing out whenever I disconnected it. So if the valse let the pressure leak through, it would naturally go into the carb.

Did it ever run right? If not and its new maybe its in backwards?

Its just so simple to replace, just do it and isolate that thing. If its not that youll have a spare.

The pump is the pressureized from the crankcase. If the valve were leaking some pressure, it does not mean the tank would have no pressure (as long as the leak were less then the crank pressure.)there would still be pressure and a good bit of it. If the crank overcomes the leak every second it runs means the tank would be getting higher, up to the preset amount the check valve is supposed to hold it at.

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03-09-2008 09:50 PM  10 years agoPost 7
Simmer

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Massachusetts

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Oh yeah one more thing. If it is bad , (and that my bet having owned a YS) now the question is why did it fail? Is it simply a bad part that failed? (10% at most is my guestimate and thats probably a high estimate) Or... is your fuel dammaging the internal rubber seal? Do not use any cator oil, (always a bad practice in my mind for helis)
Do you add oil to your fuel yourself? I dont know what you run, but you ought to be running a good quality fuel that has all synthetic based oil in it. Coolpower or Wildcat and 30% is what you should be using. If you were running S&W I would imediatly say theres your problem. (just my personal experience with the YS and heli engines in general) Dont cheap out on fuel with $1000s invested in your heli.

Again I dont know what fuel you run but the choices are limited in my mind.

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03-09-2008 10:01 PM  10 years agoPost 8
JuanRodriguez

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The Villages, Florida

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Simmer,
First of all, the YS 50 motor is not a "pumped" motor..... it simply uses crank case pressure to "pressurize" the tank.... the fuel under pressure is then delivered to the carburator where the "regulator" (along with the needle settings) meters the fuel for combustion.....

The ONLY purpose of the check valve is to keep the tank pressurized.... if it leaks , the tank does not maintain proper pressure and the fuel delivery to the regulator suffers. That is where the problems begin........

The check valve in NO WAY OR NO HOW provides pressure to the system......

So, given what has been posted by wo23dodge, I seriously doubt that there is any problem with the check valve...... is there a possibility that he has it installed backwards ??? Don't know, worth checking I guess ..... even though he says that the carb is dripping fuel indicating that there is plenty of pressure in the tank.....

My guess is that he is simply running the system way too rich as suggested by ThunderRobo causing his motor to quit unexpectedly..... then, when he goes to "see what is going on", he sees the carburator "dripping" fuel out...... very much expected if the tank is properly pressurized...........

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03-09-2008 10:10 PM  10 years agoPost 9
Simmer

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Massachusetts

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I had a YS 61 ST2 when I say pumped I mean crankcase pressure.

Yes its a check valve, and is not to provide pressure to the carb, but if the tank is presureized, that pressure goes into the carb. (I remember now your right its between the crankcase and the tank not between the tank and the carb.

Still its a cheap part and you ought to have a spare anyway. Toss one in and rule it out is all Im saying.) Might be too rich, the question remains unanswered did it ever run right? has it run well before.

I guess its the simple things we should not overlook first, good point

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03-09-2008 10:17 PM  10 years agoPost 10
JuanRodriguez

rrProfessor

The Villages, Florida

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Simmer,
Yes, I agree with you..... it's very easy to try a new check valve while making sure it is oriented the proper way..... if it does not resolve the problem, then you'll have a "spare" which you will eventually need anyway !!

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03-09-2008 11:11 PM  10 years agoPost 11
wo23dodge

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Omaha Ne, USA

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It's a new engine in a new 600N,have never had a chance to fly a tank through it
I don't see how to rich would pump so much in that it would drip out the carb after flooding the engine but I have tried running it with the needle valve open 1 1/2 turns down to 1 turn and still the same thing.

Not a lot of fun going flying with a buddy who has the very same heli but an OS in it and sitting around watching him fly while I screw with this YS

I'm pretty sure the check valve is in correctly according to the instuctions that came with the YS but I will double check it as soon as we get another warm day

I don't see how it can be anything but the check valve but what do I know? I've been flying electrics up till now.

I will say this,if I pull the line off the carb right after flying it will shoot fuel one hell of a long ways.

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03-09-2008 11:24 PM  10 years agoPost 12
JuanRodriguez

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The Villages, Florida

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I will say this,if I pull the line off the carb right after flying it will shoot fuel one hell of a long ways
Based on your comment, I would say that the valve is OK....and that our plumbing is ok......

At this point I can only suggest that you change your glo plug..... Enya 3 would be my recommendation........ and that you double check your needle settings and bring them back to factory settings......

Let me ask you this...........are you able to hover the heli for a full tank without any problems ???

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03-09-2008 11:31 PM  10 years agoPost 13
wo23dodge

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Omaha Ne, USA

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I started out with an enya #3 and now have an OS #8 in it.

I've never been able to run the engine high enough to hover it without it having a problem,ran a couple tanks through it at idle and above for break in but probably never got the blades spinning faster than 1300 rpm,spool it up to 2100 and soon after is when the engine die and fuel starts running out the carb.

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03-09-2008 11:39 PM  10 years agoPost 14
JuanRodriguez

rrProfessor

The Villages, Florida

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hummmmmmm......
this is a tough one...... but don't give up !!!!!

I think that what may be happening is that by you running the motor for an extended period of time "at idle"...... your are causing your own problems.......

What may be happening is that you are loading the motor with fuel by running it at idle for an extended period of time..... this is specially true with a YS motor......

Try this.......... start the motor.......let it settle into a nice idle.... then try to hover the motor.... BUT.....leave the glo driver on..... yes, try to hover the heli with the glo driver in place......

Then, after a minute or so of hovering with the glo driver powering te glo plug, land......quickly remover the glo driver and take off in a hover again.......

Is there any experienced flyers at your field that can give a hand ???

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03-09-2008 11:40 PM  10 years agoPost 15
brcg123

rrKey Veteran

Wagoner OK USA

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can a ys run in reverse like an os?








Trex700N, Trex600N, Raptor70, RaptorTitan, GMPCrickett, Visa

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03-09-2008 11:45 PM  10 years agoPost 16
brcg123

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Wagoner OK USA

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you might want to take the engine out and try to bench run it. that might tell you more. i'd wait till last resort though








Trex700N, Trex600N, Raptor70, RaptorTitan, GMPCrickett, Visa

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03-10-2008 12:05 AM  10 years agoPost 17
wo23dodge

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Omaha Ne, USA

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The reason I am running an OS #8 is because one attempt at flight I forgot to take the glo driver off the plug and it melted the #3 to the driver,ruined my buddies driver because the #3 was melted into the driver and could not be removed.

the engine does the same thing everytime no matter if I let it idle for 5 minutes or 30 seconds before trying to spool it up enough to lift off.

My one buddy has been flying nitro for a couple years and he has no clue either on whats going on but then he has had OS engines.

If it was an older car I would say the fuel pressure is to high and over powering the needle and seat but that doesn't apply here

Oh yeah,I do run cool power 30%

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03-10-2008 12:10 AM  10 years agoPost 18
JuanRodriguez

rrProfessor

The Villages, Florida

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wo23dodge ,
I guess the only thing I can say at this point is for you to send me your motor so that I can run and diagnose your motor for you....

PM me with for the shipping details.......

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03-10-2008 03:32 AM  10 years agoPost 19
nappyroots2182

rrElite Veteran

Moline, il

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im having the same damn problem. brand new o.s 8 plug. new fuel. new everything. needles at factory. too rich to barley spoolup. how much does it matter how far the oneway is from the backplte. the other day i had the oneway at factoy distance too and it ran great. but i made it longer so i can unplug it after every run. maybe thats the problem. im bout ready to go back to o.s.. couldnt fly today cuz of it. about 4 tanks on mine

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03-10-2008 04:09 AM  10 years agoPost 20
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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i dont have a YS50 yet, but i do have a YS91. your check valve is not likely going to be the problem. i dont know the mechanics of the 50 regulator, but on the 60-90 size regulators, there is a small valve that gets sealed by a small silicon pad against a brass pipe. after maybe 30-40 gallons of fuel (pure guess), this pad wears out. it is supposed to stop fuel from entering the diaphram when it is not needed. but when it is worn out, the fuel pressure will cause this valve to leak, giving the engine too much fuel, and also fuel comming out of the carb.

a friend of mine had this happen once, as have i.

last summer my high end wasn't running that well all of a sudden, and the engine was comming down soaked in fuel. i changed the regulator, and all has been well since.

Shawn
Team Leisure-Tech
Team HelixRC

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HomeAircraftHelicopterAlignOther › ys50st dies in flight---- PROBLEM SOLVED-----to much fuel pressure
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