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Post by racket on Jul 30, 2014 23:47:10 GMT -5
Hi Ash
I eventually used some time expired #8 bearings in my FM-1 engine and as first choice in my 9/94 engine, rattly little fellows ,some had 0.014" axial play in them , 20mm ID made them suitable on the ground down TV94 turbine shaft, just had to make sure the "radial" face on the shaft where it steps out for the piston ring diameter is square to the shaft , some weren't, as theres no need for it with the bushes .
They appear to cope OK with the extra rpm of the TV94 .
Cheers John
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Post by Johansson on Aug 4, 2014 6:17:30 GMT -5
Hi John, One of those should suit the hot side of the freepower input shaft perfectly, I hope I get lucky with Ashs special friend. I am at my mother-in-laws cabin by the lake Vänern having a great time, and have everything planned for when I get back home. I will build a tachometer for the gas producer to find out more how the engine runs and how to cure the temp problem. A pitot tube in the exhaust pipe will be fitted as well to measure the dynamic pressure. I can do this testing in parallel to the gearbox modification, so there will be lots of action in the Johansson workshop this late summer. Cheers! /Anders Hi Ash I eventually used some time expired #8 bearings in my FM-1 engine and as first choice in my 9/94 engine, rattly little fellows ,some had 0.014" axial play in them , 20mm ID made them suitable on the ground down TV94 turbine shaft, just had to make sure the "radial" face on the shaft where it steps out for the piston ring diameter is square to the shaft , some weren't, as theres no need for it with the bushes . They appear to cope OK with the extra rpm of the TV94 . Cheers John
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miuge
Veteran Member
Joined: March 2014
Posts: 199
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Post by miuge on Aug 6, 2014 7:58:43 GMT -5
Congratulations Anders for successful road test! I see everyone has little adjusting after first test drive.. Hopefully there's simple solutions for the problems.
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Post by Johansson on Aug 11, 2014 14:15:39 GMT -5
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Post by Richard OConnell on Aug 11, 2014 16:27:05 GMT -5
Interesting comments there, there's definitely a lot of interest in the time and effort that you have put into building your bike. There is a lot to be learned on this thread. Thanks Anders for sharing your knowledge with all of us!
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Lemming
New Member
Joined: August 2014
Posts: 1
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Post by Lemming on Aug 13, 2014 0:00:42 GMT -5
Signed up to this forum just to follow this thread :-D
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Post by racket on Aug 13, 2014 2:01:28 GMT -5
G'day Lemming Welcome to the Group , nice to see another local on here :-)
Yep , an excellent Build Thread
Cheers John
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Post by Johansson on Aug 13, 2014 13:19:29 GMT -5
I agree with you Richard, there is a couple of handfuls of threads here that is very informative and fun to read. I think JATO is evolving at a nice and steady pace into a very good community, many very qualified guys have joined up over the few years the site has been up and running and more are dropping in. Thanks for that Lemming, and welcome to the community!
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Post by Johansson on Aug 13, 2014 16:07:27 GMT -5
Finished the tachometer mods today, I bought a cheap handheld unit, removed the diodes and the lens and made a separate housing for them with a length of cable to the unit. I fitted the probe inside the air box and painted a white dot on one compressor wing, it works fine when rotating the engine by hand so hopefully it will work with higher revs as well. I will try it with the scuba tank tomorrow when the paint has dried. Cheers! /Anders
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Post by Johansson on Aug 16, 2014 16:13:24 GMT -5
I had to modify the optical pickup a bit to get it to work reliably, the lens was messing things up so I removed it and made some other mods tonight. With the diodes closer to the compressor wheel it reads the revs perfectly, I tested with an almost empty scuba bottle up to 6000rpm and not a single hickup so I think this will work. Everything is securely mounted so it shouldn´t end up getting sucked into the compressor wheel... With that done I started making the test exhaust pipe, earlier I had spend a few hours turning a v-band flange from a piece of stainless in the lathe and with a 4" stainless pipe bend I got to work. Before I welded it I clamped the flange down firmly to avoid any warping of the thin flange, it turned out really well in the end. Here the finished pipe is mounted to the engine, the TOT probe is fitted exactly as it is on the power turbine NGV to make sure I am reading the same temp. It can differ somewhat depending on its location if the combustion is uneven. A pitot tube will be injected through the end of the pipe to measure the absolute pressure in the exhaust. Cheers! /Anders
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Post by racket on Aug 16, 2014 17:12:10 GMT -5
Hi Anders
Thats one fine looking flange :-)
Is that a "nominal" 4" bend, or a measured 4" ID/OD ??
Is there a reduction in area from the exducer diameter ??
Cheers John
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ashpowers
Veteran Member
Joined: February 2011
Posts: 207
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Post by ashpowers on Aug 17, 2014 0:24:26 GMT -5
John, In that last image I think you are seeing a shadow from the framing member that makes it look like there is a convergent transition in the pipe. In the picture above that you can see the pipe has a continuous diameter from vband flange to the end.
-Ash
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Post by racket on Aug 17, 2014 1:37:52 GMT -5
Hi Ash
The exducer is bigger than 4", thats why I was querying the 4" pipe size and if there was some sort of reduction between exducer and pipe that might affect the running temperatures.
Cheers John
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Post by Johansson on Aug 17, 2014 1:41:20 GMT -5
Hi Anders Thats one fine looking flange :-) Is that a "nominal" 4" bend, or a measured 4" ID/OD ?? Is there a reduction in area from the exducer diameter ?? Cheers John Hi John, There is actually a slight reduction due to the lack of V-band flanges larger than 100mm around here, I believe I told you about it at some point a couple of years ago but I´m not sure. Now that you point it out I should have mentioned it earlier in this discussion, kind of forgot about it myself since it was a while ago. The radius is 4" ID all the way as far as I can tell.
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ashpowers
Veteran Member
Joined: February 2011
Posts: 207
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Post by ashpowers on Aug 17, 2014 2:15:10 GMT -5
Ah, I understand what you mean.
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