RE: JetJoe OWNERS thread
 

Thanks very much for the above. I have purchased a complete set of "O" rings and I am finding it tedious/ boring/impossible to get them into the housing! Carefully measuring they appear to want a deeper recess in the tunnel?
Can you advise how to (successfully) trim the "O" rings, does this effect a smaller/ better entry, I suppose that is asking an obvious question, but a worse on is coming! What is their function?
I ask, as the engine came without, (I think) the UK rep informed me some people do run the turbine without them. The rep also said that the compressor wheel had to go back exactly as it came off as the shaft and both wheels are balance? But the turbine wheel is not a tight fit?
Once again my thanks, I did not look for a couple of days, hence the delay.

RE: JetJoe OWNERS thread
 

Oh, man...I SO wanted to order one of the new JetJoe hats to wear to Superman next year, but the website ordering does not work...:)

RE: JetJoe OWNERS thread
 

An earlier uk rep Andy (great guy) upgraded and re balanced installing 6 stick CCs. He abondoned the 'O' rings becuase of preload binding up and sticking. However the 'outer' race could be found to spin inside the shaft. With a very sharp modelling knife trim the 'O' ring as close to flush just so it grips the outer race but the preload can still move the bearing.

At 160,000 rpm any slight imbalance then the 'play between race and shaft wall' is a possible problem for the bearing and transfers to the shaft outer and NGV. Also the oil mist lubrication should go through the ceramic balls but leaches past between shaft wall and race outer without this 'O' ring seal. For some JJ users had rear bearing failure however this was also more a lube flow rate problem.

Paul

RE: JetJoe OWNERS thread
 

Still doesn't work properly with the latest version of Firefox

RE: JetJoe OWNERS thread
 

Maybe a naive question, but could not (high temperature) silicone not be substituted for "O" rings? and give the same effect?

RE: JetJoe OWNERS thread
 

Me Again, Shall I give in? Shall I continue? I just cannot imagine the "O" rings I have been supplied,could fit the shaft tunnel, even with the suggested trimming. Even then my recess is going to be over the outer beraring roller. This may be the way its supposed to be?! But then why not just smear the outer part of the bearing with (a small amount) of some high temp compound! (silicone or something) Or has this been covered previously?
Apologies if it has.

RE: JetJoe OWNERS thread
 

Yes its possible to gunge and seal the races in but then you might as well throw the pre load spring system away as its function is to allow specific movement of the bearing forward and back under various loads. Imagine the compressor and turbine wheel as two super fast props, then as you ram up from idle to 160000 rpm there are some loads at work on the 'shaft system' similarly going back down to idle.

RE: JetJoe OWNERS thread
 

Point well taken, but I only thought of a (better) fill of the (O ring) groove and not blasting it everywhere. I could not get the O rings that were supplied to fit the groove. Even trimming, which I found was very difficult did not remove enough material to achieve a fit, although they must be the correct ones?
I had seen an earlier thread (here) where they had used RTV high temp sealent to effect a (better) seal of the engine case, they (at least that is what I thought I read) had improved the performance.
I hat using silcone anywhere, especially at five pounds a small tube!

RE: JetJoe OWNERS thread
 

I just bought the new type starter....man, I should have done that a long time ago ;)

the original one is a POS [8D]

RE: JetJoe OWNERS thread
 

Sonnich

It a complete upgrade to the original but I found the new one a bit chunky looking just seeming to need a diet:D Would look good onthe bigger motor. No more regular bendix problems found on the original. Your turbine was a modified one by Andy? so you must have more than a few hours on the ecu. Any strip down or service since?

Paul

RE: JetJoe OWNERS thread
 

Does Jet Joe or any of his agents give a discount for a bulk purchase?
Say four or five of the JJ-1200MK2 Kits.

A group of us are about to dip our toes in the water so to speak.

RE: JetJoe OWNERS thread
 

Hi Paul.
I have only run it for about 40 minutes......if you look a few hundred post`s back, I destroyed the bearings, because of a bent lube line under the front cover.
I first test ran it again a few days ago after the bearing, and starter change. I was concerned about the balance, but it runs great.

I also drilled 3 holes in the front cover, so the fuel/gas/lube line come directly out......no more bending the lines under the cover!

RE: JetJoe OWNERS thread
 

I want to upgrade my JJ1200 to a JJ1400, does anyone know what parts I need? It looks like I need the bigger compressor, the diffuser cover, air intake and front cover, can anyone verify this? Also, does anyone know whether the there is any measurable difference using the one piece tailcone as opposed to the two piece cone? Thanks.

RE: JetJoe OWNERS thread
 

reply to tvlodek

I will pass on my (little) information, after speaking to the UK rep last weekend, the items you need are a compressor wheel which has twelve "fins" (an increase of two. Also the "longer" cowl or front. There is a US website of course, sorry the info is not definitive!

RE: JetJoe OWNERS thread
 

well....I dont know ....but mine has the 12 fin compressor, and seems to use the 1200 front. The JJ-1400 front does not fit ;)

RE: JetJoe OWNERS thread
 

SJN
Falconio is nearly there, as you point out, the bits changed depending on the Engine Number. For clarity I'd just order the JJ1400 compressor (12 blade) and its 'matching' diff intake cover and a new blue fittings cover to fit. You can get the compressor unmachined ready for any profile in order to address the JJ gap losses. Jury is out on the benefits to the JJ single cone due to no accurate data being available.

Paul
RCdriver

RE: JetJoe OWNERS thread
 

SJN

Forgot about your bearings, did you open the oil flow feed up (200%), to raise to rate in order to half the oil content needed? Thanks for the pics they are always welcome. Also did yours have the new six stick fuel manifold and CC from Andy??

Paul
RCdriver

RE: JetJoe OWNERS thread
 

No, I left it as it is. It looks like the lubrication injector is the same size as the fuel injector needles......so i would guess that 1/7 of the fuel goes to the bearings. :-)

I dont remember what the look like......its some time igo i had the thing pulled apart.
But I asked andy, and he said that the sticks are inconel.

RE: JetJoe OWNERS thread
 

and yes, it has 6 sticks...

RE: JetJoe OWNERS thread
 

Isn't the compressor balanced from the manufacturer, whoever that is? Also, does anyone know the manufacturer and model number of the compressor? There's a guy I'm bought from before who will sell Garrett compressors NIB for $40 USD, I'd rather get it from him than pay $80 USD if possible. Is the "match" between the compressor and the intake/diffuser cover so bad that I'll have to machine one or the other to match myself?

RE: JetJoe OWNERS thread
 

reply to tvlodec

The compressor and turbine wheel are "matched" or balanced, from what I have been told. It is also supposed to be a factor that the compressor wheel is replaced on the shaft at the "right" position, which shoud be "marked" relative to the shaft before removal. By marking it is not meant to mean scratching the metal!
I was given the information by the UK rep. but as it was over the phone I am not absolutely sure how critical this placing is? So any other input would be useful to say the least. My turbine (a JJ1400 I think) does not seem bothered by the repositionong, but I have not run it to full power as yet!!!!

RE: JetJoe OWNERS thread
 

You would think the compressor would be spin balanced from the manufacturer then, after the entire assembly was balanced, that you could put it together anyway you want and still maintain balance..... I'm going to try putting my engine together "wrong" and see what happens. If that works out, I'm going to get the other compressor, etc and see if I can swap these parts out without rebalancing. If worse comes to worse, I'll just rebalance it. I'll keep you guys posted. Thanks for your help.

RE: JetJoe OWNERS thread
 

Thats the original lube line with the restrictor at the end so the flow should much less than an open injector needle. When its back flying again drop a line again.

Paul

RE: JetJoe OWNERS thread
 

Garrett Part No 446335-10 (or9) is the compressor used. As delivered from Garrett it wont fit a JJ1200 or JJ1400 or any other turbine. Its need profiling on a lathe and therefore rebalancing when you've chewed the metal off. What profile? well to "match"[8D] the diffuser cover you are going to use, is that a JJ1200 diffuser cover or JJ1400 cover. It might be clearer the $40 saved is going fast machining and balancing. Buy the "matching" compressor, diffuser cover and blue intake cover for a JJ1400 from Joe. Substitute the the compressors with the rear face pink mark in the same position and static balance at least. Anything turning 160,000 rpm does not last long if its not balanced. You could leave it unbalanced and replace the bearings, shaft, tunnel and NGV every few months I guess [:-][8D]:)

RE: JetJoe OWNERS thread
 

Paul, do you think the restrictor is too small ?
It looks like the same size of the one in my simjet 3000.