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!
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.
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)
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 .
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"
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!
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?
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.
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
Yay I figured out how to post pictures! Here is the engine in its past and present form. A friend gave me a furnace blower that I tried hooking up as a power wheel, running on the smaller turbo I have. The engine would run up to about 5psi, I think fuel being the limitation. The power wheel actually turned pretty good! I could still stall it out, but was a fun experiment.
My hopes are to make a jet engine powered kart, ideally with a power wheel, not just thrust.