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HelicopterEngines Plugs Mufflers Fuel › OS 91 sz cline fitted running lean
11-21-2006 06:45 PM  11 years agoPost 1
wheelie kid

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peterborough uk

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Can any body give us any idea as what to do next. OS 91 Sz with a cline carb fitted . with a full tank its rich and then as the fuel becomes lower in the tank it begins to lean out. (great power with a nearly empty tank) . i was thinking about fitting a perry pump to the cline ? any one tried this ?

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11-21-2006 07:20 PM  11 years agoPost 2
tris_heli

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Lidlington, Bedfordshire, UK

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I wouldn't use the perry pump with the cline, as they work on a totally different principle...

Does the tank hold pressure ?... What about the one way valve on the crank case ?, is this the right way round ??..

It almost sounds like the engine is struggling to pull fuel through as the tank empties, which makes me wonder if its being pressurized correctly (clines work with a high, 6psi or more, tank pressure).

You can try swapping the one way valve with the ys version. Oh, also check that the nipple on your back plate hasn't blocked up..

Cheers
Tris

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11-21-2006 07:36 PM  11 years agoPost 3
wheelie kid

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peterborough uk

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Hi tris_heli .
The engine is fitted in a rap90 . I know that they do make a metal fitting for the tank (tank leaking). If i pull the feed pipe off the cline, fuel pours out every where.Also if i pull the pipe off the tank from the one way valve after flying there is alot of pressure there the tank has blown up due to the pressure inside .I tried so many different things . i've trashed one sz all ready (running it lean).

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11-21-2006 07:42 PM  11 years agoPost 4
Rogue123

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Phoenix AZ

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Read my reply. In this thread.

http://runryder.com/helicopter/t290514p1/

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11-21-2006 07:46 PM  11 years agoPost 5
tris_heli

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Lidlington, Bedfordshire, UK

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Hmm, it sounds like you really need to have someone who's had experience with clines to have a look over it for you..

So the tank's being pressurized and remains pressurized after the flight. Do you use a header tank ???. If so is there any air in this after the end of the flight ? (when you don't run the main tank totally dry ofcause ?)

On my R90, I used to use a Velcro tie which went around the tank and put inward pressure on the tank fitting, which stopped it leaking. I doubt this is your problem though as you have loads of pressure at the end of the flight.

Also, ive seen people get cyno inside the cline when they glue the cream 90deg bend/coupler onto the cline itself.

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11-21-2006 08:02 PM  11 years agoPost 6
wheelie kid

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peterborough uk

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tris_heli
I took the header tank off! something less to worry about i thought . No one else uses a cline at our club.

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11-21-2006 08:37 PM  11 years agoPost 7
wheelie kid

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peterborough uk

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Rogue123
so your using a perry pump with the os regulated carb .So maybe a cline carb would work! Perry pump forces the fuel to the cline which regulates the amount of fuel flowing to the carb . Not getting any where at the moment , might as well try it.

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11-21-2006 10:14 PM  11 years agoPost 8
Droid

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Deep down in the Southwest- UK

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What size fuel tubing are you using?

Quotes may have been changed for my own amusement

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11-21-2006 10:53 PM  11 years agoPost 9
Rogue123

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Phoenix AZ

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Yes.

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11-22-2006 01:36 AM  11 years agoPost 10
Jerry Sudimick

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Connecticut

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Alternatively....you could figure out what you are doing wrong and fix that. There are hundreds of cline setups that seem to run without having to put a pump behind them.

Or....add a perry pump, or how bout a fuel pump from a car? That might do it.

Is the fitting on the tank leaking? What kind of checkvalve are you using? What exhaust/plug/fuel/gearing/blades etc.

Jerry

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11-22-2006 07:36 PM  11 years agoPost 11
wheelie kid

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peterborough uk

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Jerry Sudimick
raptor 90,690 v blades 8.27gearing, mp2 , tried the cline check valve and the ys 91st4 check valve, os No8 plug fitted running on magnum 30%.fuel tubing internal diameter is 2.0mm. I have a pressure gauge,the tank holds 15psi . i,ve heard the tank pressure created by the crankcase runs up to 6psi. the cline regulator holds about 8psi on my gauge. if you then use a small piece of fuel tubing and hold it to the drilling on the metal back plate of the cline the pressure releases. this tells me that every thing is working ok ! i brought the cline because the non pumped carb was giving me the same problems? . jerry if the car fuel pump would work i've have fitted it by now!

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11-22-2006 09:53 PM  11 years agoPost 12
Jerry Sudimick

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Connecticut

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What headshims are you running. I see that you are running Magnum 30%...

Jerry

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11-22-2006 10:24 PM  11 years agoPost 13
wheelie kid

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peterborough uk

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I have all of the shims under the head now.

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11-23-2006 01:44 AM  11 years agoPost 14
Jerry Sudimick

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Connecticut

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I guess first off, make sure your idle is set to an actual idle. I notice that most of the time, everyone insists on having the engine racing so high that the clutch shoes are about skipping off the liner at their 'idle' setting.

If your idle is too high, its always gonna hang. You should have TH Hold and your normal idle set so the engine is nicely puttering away. Quiet and smooth and steady.

Next, if she still hangs really bad - I'd add a .008" shim. See how that influences things. If it makes a marked improvement, try to back off with a .004" Magnum likes shims.

Jerry

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11-23-2006 06:16 PM  11 years agoPost 15
wheelie kid

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peterborough uk

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What fuel do use jerry ? i've been looking at using wildcat ?

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11-23-2006 07:00 PM  11 years agoPost 16
DOKEY

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Northamptonshire UK

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Hi Steve,

Mine was on Wildcat 20% or the Curtis WC 30%, never did have a problem like you are talking about
If you can not solve it, then you are welcome to come over this way, and try my cline carb out ? see if it solves the prob, then you at least know it is the carb side of things for sure

Ryan.

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11-23-2006 07:23 PM  11 years agoPost 17
wheelie kid

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peterborough uk

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Hi buddy
That would hit the nail on the head . If some good weather comes along one weekend and your not busy, i'll make plans to come over to see you .

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12-04-2006 07:02 PM  11 years agoPost 18
wheelie kid

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peterborough uk

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The best i've had my engine running . Fitted the c-spec pump to the bottom .

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12-04-2006 07:08 PM  11 years agoPost 19
DOKEY

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Northamptonshire UK

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Should be able to get it to run well without having to convert back to the perry pump, don't understand

Where did you get it from (omi cline carb) ??

Ryan.

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12-04-2006 07:17 PM  11 years agoPost 20
Jerry Sudimick

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Connecticut

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Wheelie,

Im looking at the picture in your gallery, and it appears you are venting the fuel tank to the atmosphere. The perry pump traditionally still requires muffler pressure in the tank.

As far as fuel....you should be able to get this system running correctly with any available heli fuel.

Also - I have seen your issue in other Raptor 90 installations. If you utilize the Cline system, and try to put a YS checkvalve between the backplate and the bottom fitting of the tank - it could cause pressure issues. The YS checkvalve requires just under 4 inches between the pressure tap and the checkvalve. Putting it less than 1 inch from the fitting in that small space between the backplate and bottom tank nipple can create pressure issues. By putting the YS checkvalve 4 inches off the backplate and plumbing it to the top tank fitting (in back) it works much better. I don't know how you had it, but I thought I'd mention it for the benefit of everyone.

Jerry

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HelicopterEngines Plugs Mufflers Fuel › OS 91 sz cline fitted running lean
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