barnyard
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Post by barnyard on Jan 15, 2018 19:02:55 GMT -5
Excellent build Anders! The projects you guys can accomplish with your spare time is impressive! It’s inspiring to a lot of people I’m sure:)
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barnyard
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Posts: 36
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Post by barnyard on Sept 27, 2017 12:59:53 GMT -5
I'm guessing you already have the load cell wired, and are just struggling with the menu setup, but incase you haven't got it wired yet, my understanding of this is: Black wire from you load cell would go to +12v (terminal 4) of the display. White wire from you load cell would go to -12v (terminal 3) of the display. Red wire from you load cell would go to signal + (terminal 10) of the display. Green wire from you load cell would go to signal - (terminal 9) of the display. Get your friend to double check this, but if I was wiring the sensor this is how I would do it. Good luck! James
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barnyard
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Post by barnyard on Jul 13, 2017 15:58:19 GMT -5
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barnyard
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Posts: 36
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Post by barnyard on Jul 13, 2017 12:02:07 GMT -5
Hi, it's been a long time since my last post, but here are some pictures of the completed combustion chamber. I was able to re use the turbo flange and the flame tube cap from the old combustor. I'm using a single scroll turbo now to, and with this setup the engine is running great! I can run it up to around 15psi boost, and it starts reliably. I'm still limited by my fuel pressure of 80psi, and am working on modifying a boat hydraulic trim pump to be the new fuel pump, hopefully with pressures up around the 500psi mark. Definitely a success in my books though! Thanks for all the help in sizing a new combustor guys.
James
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barnyard
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Post by barnyard on Jan 5, 2017 8:03:58 GMT -5
Fantastic build Anders! I'm loving all the printed parts (and the machined parts too). What type of 3D printer are you using, and what type of plastic?
James
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barnyard
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Post by barnyard on Nov 6, 2016 20:53:38 GMT -5
Wow that's awesome info ausjet, thank you so much! I hope I haven't over tightened it already, but I think I'm safe. Now I won't have to worry about the compressor coming off and blowing up in my face!
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barnyard
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Posts: 36
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Post by barnyard on Nov 5, 2016 22:48:05 GMT -5
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barnyard
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Posts: 36
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Post by barnyard on Nov 5, 2016 22:47:14 GMT -5
Hey mate let me know if you need any info on your CAT turbo I should be able to help out- part numbers/exploded view diagram, prices, disassembly/assembly instructions etc Hey thanks ausjet! Sorry for the wait for a reply, I was finding turbo numbers. I could definetely use some help finding a torque number for how tight to tighten the compressor quill nut. I took it off to inspection and guess at how tight it should be. Dunno if you have any info on that, but if u do I will take it! Here is a picture of the tag on the turbo with part number. Maybe they mean something to you. Thank, james
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barnyard
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Post by barnyard on Nov 1, 2016 13:59:46 GMT -5
Smithy I know what you mean by the inevitable "Pop"! I like your idea of a propane injector blowing across a spark plug, I think that's the route I'm going to try. Simple and I have the materials for it! (I'm cheap)
Thanks, James
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barnyard
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Post by barnyard on Nov 1, 2016 13:56:20 GMT -5
Hi James Try 12 holes at 7/16" dia at 4.5 inches down from the top , I'm assuming you are still using the 70 mm inducered comp , secondary holes at 9 inches down and tertiary at 12 inches . Cheers John Hi John, thanks for the advice, it's much appreciated. I was originally thinking to do 5/16" holes for primary, but with your advice I'll change it up to the 12 primary holes at 7/16", 6 secondary holes at 1/2", and 10 tertiary holes at 5/8". It's a lot less holes to drill then with 5/16" Thanks, James
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barnyard
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Post by barnyard on Oct 31, 2016 18:10:28 GMT -5
Hi guys, another question, as I design the flame tube, seeing as I'm using a spray nozzle, not an evaporator, should I start the primary holes farther down to flame tube, instead of putting then close to the top (nozzle end)? I attached a quick sketch I did to show the spray pattern and where it would hit the wall. The nozzle I have is. 4gph 60 degree cone spray. With a 60 degree spray, the spray will hit the flame tube wall 5.375" down from top cap. Should I start the holes around there? Jet spec says I need a 16.25" long flame tube, so I wonder then if I should just shrink the distance between the secondary and tertiary holes, so that I have extra room above the primary zone. Thanks, and I hope I'm wording my question clear enough! James
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barnyard
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Post by barnyard on Oct 31, 2016 11:26:33 GMT -5
I'm working on a new combustion chamber for the engine, I'll put up some pictures soon.
Hey question, has anyone used a hot surface igniter on liquid fuelled turbine engines? I've been using a spark plug with mediocre results. My only thought with the hot surface igniter is the fuel spray might cool the igniter surface down to much to ignite.
I've seen the Hot Streak igniter that Smithy is using, but that has its own fuel supply right? It acts like a small blow torch used to light the main fuel supply?
James
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barnyard
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Post by barnyard on Oct 16, 2016 18:57:10 GMT -5
Ok John I will shrink down the flame tube piping I have then to give more clearance to outer wall.
I'm still not sure what turbo I should use. I have a smaller twin scroll turbo, 70mm compressor inducer, 85mm turbine exducer. Compressor is .75 AR. Turbine is 1.6 AR. The second turbo I have is a single scroll, compressor is 72mm inducer, and turbine is 93mm. I don't know the AR's though. centre section is tagged CAT part number OR-6100, serial number 4mf-047.
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barnyard
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Post by barnyard on Oct 16, 2016 17:58:50 GMT -5
Hi guys, I'm building a new combustion chamber for the engine. I've got a 178mm ID fire extinguisher that I want to use for the combustor. I would like to use a 153mm OD flame tube, but that only gives me 12.5mm clearance between the combustor and flame tube. Is 12.5mm enough of a gap to allow air to circulate all the way around the flame tube? Thanks, James
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barnyard
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Post by barnyard on Oct 12, 2016 15:49:13 GMT -5
Hey John, I have seen your kart, and read most of that thread, very inspiring! I like your idea of a fire extinguisher for a combustor can, and plan to borrow the idea.
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