Jetcat third fuel pipe mystery
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Jetcat third fuel pipe mystery
I have a Jetcat 160sx internal kero start which i bought second hand. The front cover has 3 cut outs for fuel pipes. Two are used by the igniter and main fuel pipes. The third cut out doesn't have a pipe/festo coming out from the front cover but under the front cover there is a brass fuel pipe that goes down into the engine just like the main and igniter pipes do. What is that pipe for?
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From my experience with Jet Cat turbines, you are missing the bearing/lube regulator. This is a small aluminum fitting that attaches to the main fuel port with a tee fitting and is used to deliver fuel/oil to the bearing tunnel. If you run this turbine like this you will burn up the bearings.
Larry/Instructor
Larry/Instructor
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From my experience with Jet Cat turbines, you are missing the bearing/lube regulator. This is a small aluminum fitting that attaches to the main fuel port with a tee fitting and is used to deliver fuel/oil to the bearing tunnel. If you run this turbine like this you will burn up the bearings.
Larry/Instructor
Larry/Instructor
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I have put a lot of hours on this engine in the last 2 or 3 years, much of it at full throttle, so I don't think its a missing lube tube or that would have shown up long before now! I also happen to know that the other end of the tube just comes to an end behind the diffuser, it's not connected to anything inside the engine except open space, and that the lube is Tee'd off the main supply inside the engine rather than under the purple cover.
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Larry
Last edited by Instructor; 10-09-2017 at 08:33 AM.
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I have ben flying Jet Cat turbines since 2000, and I don't recall them ever having an Air Start turbine. I don't have a Kero start turbine so If the lube system is different on a Kero start turbine, I wouldn't know. The original owner might have an external lube system he was using and did away with the setup the Jet Cat had.
Larry
Larry
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The pipe is definitely the one in Dave Wilshire's photo, thanks Dave. The problem is that the other end of the pipe stops in mid air inside the engine, whilst the Tee off for the lube is inside the engine. I am beginning to suspect that a previous owner has done his own modifications to the engine
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The JetCat tech is named George and I cannot remember his last name. He's the one that got JetCat certified when Dreamworks picked up the importer/distributor rights.
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just looks like it would have been used to either measure case pressure or maybe to pressurise retract tanks through a one way valve when people were experimenting with this a few years ago. Can't imagine the engine running particularly smoothly at low power unless its capped off.
jason
jason
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I took the cover off one of my 160sx motors and it is plumbed just like the picture Dave posted. I was always told that line and restrictor assembly was metering fuel to lube the motor bearings. Harry...your motor must have a mod done to it, if you find out why it was done and how the bearings are being oiled please let us know.
Vin...
Vin...