jasonr
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Joined: October 2019
Posts: 28
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Post by jasonr on Jan 31, 2020 12:08:56 GMT -5
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jasonr
Member
Joined: October 2019
Posts: 28
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Post by jasonr on Jan 31, 2020 12:11:02 GMT -5
I've added a few of the pictures I took.I have some dents to fix on the casing, as far as manuals I have the the field maintenance and disassembly manual and operations manual plus the thompson aviation manual for j44-20.
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jasonr
Member
Joined: October 2019
Posts: 28
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Post by jasonr on Feb 10, 2020 5:51:03 GMT -5
Darren, I was watching your latest video man your engine looks and sounds great. You're new igniter plug is from a J47 engine I'll post a picture of it. I was wondering if you had any dents in your outer casing and if you left them alone or worked them out I may work mine out they shouldn't effect combustion or engine running though. Jason
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jasonr
Member
Joined: October 2019
Posts: 28
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Post by jasonr on Apr 5, 2020 15:05:11 GMT -5
Anybody know what kind of oil these engines were stored with?
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duncan
Junior Member
Joined: December 2014
Posts: 68
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Post by duncan on Jun 25, 2020 20:58:31 GMT -5
Hi Darren, well thanks for your help so far it's been very informative. My starter I found was a used and abused jayco that I sent in to have rebuilt buy some friends who own a shop, in breaking loose the shaft and bearings they cracked and twisted the housing "don't ask me how that happened" so they are going to try and weld the housing back together but doesn't look promising. I was able to source a spare engine that has the fuel control unit, tachometer, and the original ignition box, fuel lines and the air-starter. Fuel filter looks good but most everything else has some sort of corrosion, the previous owner didn't know much of anything about it except that its been sitting for awhile.I couldn't get a look at the turbine because they had a wooden cover inside that was sealed with silicone I guess to keep rodents out, I needed all the other stuff so I bought the engine and got it home and started disassembly of the exhaust cone got that off of there to look over the hot section and . The entire turbine nozzle guide vane assembly disintegrated into the turbine. Well damn, I was hopeful to get a good hot section but the search continues, I have just about everything else for a running engine. Hi Jason, sorry to hear of the bad hot section but that is typical of these 'disposable'/short-life engines that have been either overheated or just lots of hours. Hope all is well otherwise... keep up the good work and let me know if you need anything J-44 related.
DD
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duncan
Junior Member
Joined: December 2014
Posts: 68
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Post by duncan on Jun 25, 2020 21:04:16 GMT -5
Darren, I was watching your latest video man your engine looks and sounds great. You're new igniter plug is from a J47 engine I'll post a picture of it. I was wondering if you had any dents in your outer casing and if you left them alone or worked them out I may work mine out they shouldn't effect combustion or engine running though. Jason Hi Jason, thanks for the info! I haven't been on JATO in a few months so sorry I'm long in a reply! I bought a couple of those igniters to experiment with & they certainly produce a much larger spark! Minor dents are not a problem but major dents distort the case, possible causing a misalignment of the shaft & therefore the turbine/compressor wheel in relation to the diffuser or nozzle. I smoothed the few little dents then sanded it with a D.A.! Mark told me how to proceed; I would never have thought to do that!
DD
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merlin
Junior Member
Joined: November 2020
Posts: 54
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Post by merlin on Nov 10, 2020 10:17:28 GMT -5
I like that engine, its simple, elegant and can be used and maintained by an amateur, i wish i could get one. How much does it cost?
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jasonr
Member
Joined: October 2019
Posts: 28
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Post by jasonr on Nov 15, 2020 17:06:48 GMT -5
I like that engine, its simple, elegant and can be used and maintained by an amateur, i wish i could get one. How much does it cost? Merlin, seems like a running engine would run between $3-5k depending on which model you want. Darren D on this thread is much more knowledgeable than myself on this engine and I think he has the only running J44-R-24 around. He did a beautiful job restoring his. I spent spent $6oo on a J44-R-24 for parts, $1000 on a J44-R-20B this is a more complete parts motor. I was able to source a newer starter for $800 and found another J44-R-24 with a new turbine and ngv for $650 which need to go out to get balanced.I plan on putting a complete engine in a Honda Odyssey challenger frame. I am working on plumbing and electrical, but work and family have slowed my progress Hope this helps, again reach out to Darren he has a wealth of knowledge on this engine. Jason
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duncan
Junior Member
Joined: December 2014
Posts: 68
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Post by duncan on Apr 18, 2021 9:42:44 GMT -5
I like that engine, its simple, elegant and can be used and maintained by an amateur, i wish i could get one. How much does it cost? Hello Merlin, basically Jason stated in his reply that costs vary widely depending upon availability & pure 'luck'. In hindsight, I overpaid for my engine ($6,000!) which had a burned-up hot section to start with. I bought 2 parts engines, missing fuel system & accessories but in like-new condition internally, to supply parts (mainly the turbine rotor & turbine stator (nozzle)). I also had to buy a starter, used & beat-up, for $800, then spent $150 to get new bearings installed & the commutator cut/finished. Now we turn to the run stand, associated wiring & plumbing, fuel tank, batteries & control console. I am fortunate to have a buddy that owns a fabrication business, who helped me with the stand. He designed & we built it in his shop. Go to my You Tube channel, "Darren Duncan" for the complete story, documented from the beginning! Very dry & boring sometimes but if you like small gas turbine engines, you will learn something. It is a "Simple jet engine for simple minds!" It's designed as an 'expendable' (economical) power plant for unmanned aircraft experiments during the 1950's, such as early cruise missiles & target drones. The J44 is inefficient, with a SFC of 1.65, due to the low pressure ratio (<4), so it burns a lot of fuel for the power it makes! I would like to move up to a more modern business jet class engine, such as a G E CJ610 or something similar.
Cheers!
Darren
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duncan
Junior Member
Joined: December 2014
Posts: 68
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Post by duncan on Apr 18, 2021 10:12:01 GMT -5
Darren, I was watching your latest video man your engine looks and sounds great. You're new igniter plug is from a J47 engine I'll post a picture of it. I was wondering if you had any dents in your outer casing and if you left them alone or worked them out I may work mine out they shouldn't effect combustion or engine running though. Jason We had to modify this plug to work on the J44, by welding a flange on to match the original plug mounting location, then discovered that the engine would NOT start using it! With fuel spraying out of the exhaust, the entire inside of the engine was wet with fuel, except for the igniter plug! Bone dry. Why? We assume its the gap around the parameter of the plug body, where it protrudes through the combustion liner, which is almost non-existent with the stock plug but almost 0.025" (annulus) with the J47 plug. This gap allows compressor air to blow-in around the plug, shielding it from fuel spray! Mark fabbed a stainless baffle plate that blocks the air infiltration, allowing fuel to reach the igniter. I like the much larger spark developed by this plug versus the small little 'tick' spark produced by the original J44 plug.
Darren
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