barnyard
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Joined: October 2016
Posts: 36
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Post by barnyard on Oct 12, 2016 11:07:38 GMT -5
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.
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barnyard
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Joined: October 2016
Posts: 36
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Post by barnyard on Oct 12, 2016 8:05:05 GMT -5
Hi Brendon, welcome, and that's a nice looking turbo! James
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barnyard
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Joined: October 2016
Posts: 36
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Post by barnyard on Oct 11, 2016 20:59:26 GMT -5
Hi James Stick with your spray nozzle , ideally use a hollow cone spray pattern nozzle , the variflo nozzles will help with atomisation at lower power settings www.delavaninc.com/variflo.htmUsing the larger turbo for a freepower would be possible , though you may need to "wastegate/dump" some of the gases exiting from the smaller turbo gas producer to prevent it surging . Cheers John Thanks John for the nozzle info. I see the charts show up to 300psi, is that what most people are running? Seems pretty high pressures to attain DIY. What kind of pump would I need for that? James
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barnyard
Member
Joined: October 2016
Posts: 36
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Post by barnyard on Oct 11, 2016 10:43:18 GMT -5
Thanks Jeff for the clarification on surging, good to know it doesn't sound like that. I'm not a fan of damaging turbo's. James
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barnyard
Member
Joined: October 2016
Posts: 36
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Post by barnyard on Oct 11, 2016 10:29:08 GMT -5
Ok diesel it is! Yah I figured someone would say the flame tube was to small, I built it 3 years ago, before I knew about Jetspec:(. So I will change combustor and flame tube size to match jet spec then, and try some diesel. What's you thoughts on the fuel spray nozzle, should I change to a evaporator style? Also, I do have a smaller turbo, 2.71" inducer, 3.36" exducer, would that be a better suited turbo sizing? And if so, do you think I could use the larger turbo ( 3.76" exducer) as a free power wheel?! Thanks a lot for the help, James
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barnyard
Member
Joined: October 2016
Posts: 36
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Post by barnyard on Oct 10, 2016 22:46:26 GMT -5
Hi guys, this is my first post, and my first jet engine! I've build a jet engine using a turbo from a large catapillar generator. Currently the engine will start up and build rpm' and boost, about 2psi, then it blows out and shuts right down. I start it with a leaf blower, and I've been running it on gasoline , yeah I know crazy and dangerous, but it hasn't burn down the place yet. I do plan to run diesel, but for right now my fuel system consists of a EFI fuel pump and a 4.00Gph hollow furnace oil nozzle.
The turbo inlet inducer is 70mm, and the exhaust side exducer is 94mm. My combustion chamber 6" diameter and about 13" long. The flame tube is 4" diameter, and I laid out the holes using jet spec as best I could. I did have the inlet tube to the combustor going in at a tangent, but after reading lots of advise against that I have since changed it a more centered approach. I really don't know why the turbo blows out, I've tried putting a larger fuel nozzle in and the turbo will spool a lot higher, say 10psi, but still flutters and then blows out. The flame tube is pretty black with soot though which seems like it's rich, so I'm stumped. Any advice is welcome:) thanks, James
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