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HomeAircraftHelicopterThunder TigerRAPTOR 90 › Question about running fuel lines for crank case pressure?
02-04-2010 12:07 AM  8 years agoPost 1
LonR

rrElite Veteran

Macomb,Mi

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How do you guys run the fuel lines for a crank case pressure motor?I have a OS 91SX-H C-Spec with Cline carb and need to know which nipple do I run the presser line to on the tank,the bottom or top back one?I know the one in the middle front (clunk) gos to the carb haha,just never ran a motor like this..Thanks guys.

O-yea,where should I vent the presser from after flying?

600LE,OS55,OS PowerBoost pipe,Align 610's,Spartan

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02-04-2010 12:13 AM  8 years agoPost 2
tarzan_eb

rrApprentice

Central Illinois USA

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I run mine to the top back one then pull it off the same place to release pressure before fueling

Fly it ! Crash it ! Rebuild it ! Repeat as needed !! Everett

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02-04-2010 12:14 AM  8 years agoPost 3
LonR

rrElite Veteran

Macomb,Mi

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Cool and thanks for the reply sir .

600LE,OS55,OS PowerBoost pipe,Align 610's,Spartan

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02-04-2010 01:12 AM  8 years agoPost 4
gftazz

rrVeteran

upstate N.Y. in the Adirondacks

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I put mine on the bottom one.
I did the opposite. I put it on the bottom nipple so I don't have to touch it with the check valve there. I then put a small piece of tubing with a chrome Thunder Tiger stopper in it on the top back nipple. When I want to refuel or release pressure I just pull it off the top back of the tank.

I also used a YS small check valve as the one I got with the Cline modded SZ motor was locking up not working right. Just so you know where to get one if yours does the same. I checked about this at IRCHA with Steve Helms the OS and Futaba guy thats what they said to use.

Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!

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02-04-2010 02:03 AM  8 years agoPost 5
LonR

rrElite Veteran

Macomb,Mi

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gftazz,
That does sound easyer.I just thought putting the pressure line on the bottom it would make the fuel bubble but after thinking about it the top would do the same inverted.I allready bought a check valve for a YS 91 so im good to go there.Thanks for the info and the bottom nipple it is .

600LE,OS55,OS PowerBoost pipe,Align 610's,Spartan

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02-04-2010 03:06 AM  8 years agoPost 6
tarzan_eb

rrApprentice

Central Illinois USA

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If you put it on the bottom it will cause the fuel to bubble when it puts in air pressure. you don't want that.

Fly it ! Crash it ! Rebuild it ! Repeat as needed !! Everett

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02-04-2010 03:16 AM  8 years agoPost 7
tarzan_eb

rrApprentice

Central Illinois USA

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You got the right check valve it needs to be as close to the crank pressure nipple as you can get it.I got a short piece of tubing on it runs up back of engine inside the frame far enough that you can see the end through the little hole in the frame on muffler side put the check so you can see it through the hole. take another piece of tubing run the rest of the way up the front of tank and over top to the top back nipple. when you want to vent tank pull it off and vent.

Fly it ! Crash it ! Rebuild it ! Repeat as needed !! Everett

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02-04-2010 03:46 AM  8 years agoPost 8
LonR

rrElite Veteran

Macomb,Mi

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If its a problem on the bottom then it would be a problem on top while inverted because its allways pumping air in the tank or am I wrong?I do alot of inverted flying so it will be the same way when the heli flips,all the fuel is at the top nipple and the crank case pressure is pumping air in the tank.

600LE,OS55,OS PowerBoost pipe,Align 610's,Spartan

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02-04-2010 04:25 AM  8 years agoPost 9
jsenicka

rrProfessor

Eagle River, WI

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I run all mine to top of tank with a Tee in the line to remove pressure. I don't think it makes a major difference in top or bottom as far as pressure in to the tank.

Jim Senicka
Team Manager, GrandRC Flight Team

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