Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

New/old Jett motors.

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Old 10-20-2005, 11:42 AM
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fly-guy-ty
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Default New/old Jett motors.

Just picked up these two motors last night from my clubs president. One is a 50. The other one is unknown. It does not have any engravings in it. Looks like the old engine has had a lot of time on it and a fair amount of gunk in the fins on the head. cylinder looks like it is in fine shape. motors also came with two red Jett mufflers and the manifold/tuned pipe combo shown. Also gave me a partially built shrike kit. Couldn't turn down the deal!
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Old 10-20-2005, 12:19 PM
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Default RE: New old Jett motors. Bob? what is this?

Hi Rev Bro: Whata want with those old worn out motors and plane thats not even a arf. You should just package it all up and send the stuff to me for safekeeping, will pay postage for sure. Well, to be honest, the word safe is just not approporiate when used in connection with me. Rev Bro # 119
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Old 10-20-2005, 12:22 PM
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Default RE: New old Jett motors. Bob? what is this?

I'd start with a crock pot cleaning.
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Old 10-20-2005, 09:11 PM
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Default RE: New old Jett motors. Bob? what is this?

Stroke x piston top area = displacement
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Old 10-21-2005, 09:00 AM
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Default RE: New old Jett motors. Bob? what is this?

yea, I will do those measurements to find out displacement. My question mainly for Bob is where do I start? Is this something that I can clean up myself and replace worn out parts. Or, is this something best left for Dub. It couldn't be too expensive to have this thing fixed up? I'm sure it would be worth whatever it costs. I did look at Dub's site and the bearing is not very expensive and his breakdown and inspection of an engine was like $35.00? I am real curious as to how old this thing is. Any info or suggestions would be appreciated
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Old 10-21-2005, 09:49 AM
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Default RE: New old Jett motors. Bob? what is this?

The first and second photos looks like an early to mid 90's motor from the case and carb design (low-end adjustment have needle for adjustment vs. newer version fit flush). The third photo is probably late 90's to early 2000 from the new improved cast case based on the bump on the bottom. I think that's what it looks like, but Bob can confirm that.

The gunky and leaky head is a sign of worned out motor either from owner didn't tighten the head screws properly and caused a leak or onwer didn't really take good care of it. Jett engines should not have a leaky heads from my experience from all that I've owned. They all looks brand new with everyone I have. Just a thought!
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Old 10-21-2005, 09:58 AM
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Default RE: New old Jett motors. Bob? what is this?

Yeah, I'm not sure how or why this motor got into such dis-repair and gunked up. The previous owner is a very detail oriented modeler who now scratch builds & flies his own turbine jets. I am pretty sure the 50 was purchased by him originally, but the gunky motor I can't say for sure if he was the original owner.
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Old 10-22-2005, 11:59 AM
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Default RE: New/old Jett motors.

SSAn is about right here...

the yucky looking one without the ID on it, looks like a Version 2 (old crankcase) .40 engine. Might be a 46, hard to tell. ... but since it was not engraved, its probably an older .40 (prior to 1996)

The other one, with the machined larger boss on the bottom of the case, is a new-er engine - Version 3. Built after 1997. That can be rebuilt.

The old one, clean it up with an old crock-pot and anti-freeze (outside). Replace the bearings. Probably will run ok if not phycially damaged inside.

Sad to see someone let engines like this get in this bad a shape!

Bob
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Old 10-22-2005, 07:22 PM
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Default RE: New/old Jett motors.

yes, i know. but know i am the new owner and if it is salvageable, i will take much better care of it in the future. I think i will clean it and send it to Dub.
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