ABM
New Member
New to all of this, amazed at this community. Been lurking for a while.
Joined: November 2021
Posts: 4
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Post by ABM on Nov 28, 2021 14:58:32 GMT -5
Hello,
I'm planning on building a turbojet engine as a project. I currently have two Mitsubishi TD03 Turbos from an N54 BMW engine, but each of them is so small so I was thinking of combining their inlets and feeding their combined air to the same combustion chamber.
Compressor:
- Inducer dia 38mm
- Exducer dia 25mm Turbine:
- Inducer dia not sure until I chop off the car's manifold, but seems very roughly like 25mm - Exducer dia very roughly 35mm
I'm also assuming I would need to remove the wastegates and weld their ports shut or something? I haven't went into the main design or so yet, just want to ask y'all about the viability of using these turbos in a turbojet. Pics attached.
Thanks in advance!
(https://imgur.com/a/1PoGz8e)
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Post by racket on Nov 28, 2021 15:55:53 GMT -5
May I suggest you find a much larger turbo to use , this will give you a greater chance of success than using these turbos
Cheers John
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ABM
New Member
New to all of this, amazed at this community. Been lurking for a while.
Joined: November 2021
Posts: 4
|
Post by ABM on Nov 29, 2021 18:28:54 GMT -5
Thanks for he recommendation John! Time to rebuild that old Garrett T3/T4 I have lying around. ordering a rebuild kit today -ABM
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Post by racket on Nov 29, 2021 22:51:27 GMT -5
The T3/4 units can have a missmatch of comp /turb sizes, you want the "hole out" turb exducer area 20% greater than the "hole in" comp inducer area otherwise you could have problems .
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ABM
New Member
New to all of this, amazed at this community. Been lurking for a while.
Joined: November 2021
Posts: 4
|
Post by ABM on Dec 2, 2021 22:51:06 GMT -5
Yikes, in my case the comp inlet and turbine outlet areas are roughly equal and this is my only other turbo option. Would restricting the entrance to the compressor (with a nozzle/funnel etc) help alleviate the issues arising from the lack of expansion at turb side?
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Post by racket on Dec 3, 2021 1:39:23 GMT -5
You can try using it but be careful of your temperatures
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Post by nicenozzle on Mar 22, 2023 12:45:04 GMT -5
Aside from the fact that smaller turbos are much harder to work with for this, it would be very cool. I've been working on a compound turbojet design where each compressor feeds the other sides combustion chamber, much like a twin turbo works in a car, causing a natural equilibrium among each turbine.
Basically like you're building 2 turbojets, just linking them together, might save you a bit of work on making everything perfect since they don't need to be exactly even to run the same.
Yes definitely weld the wastegates, sand down very well, need a clean even flow in each side
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