Turbo Selection Advice

[nscurt]

Good day everyone,

This is my first time posting and first time building a turbojet engine, I've been reading the forms for a bit gathering information on the subject matter.
I was just curious if I may be able to get some advice on a turbocharger I am thinking of purchasing, the only specs I have on the turbo are as listed:

Borg Warner :
Part Number: 171270
Model Number: S2EL196
Twin scroll exhaust, no wastegate

From what I can gather so far, here are the dimensions:

Compressor Inducer/Exducer: 40.6mm/60.6mm
Compressor A/R: Unknown

Turbine Inducer/Exducer: 69.6mm/60.7mm 
Turbine A/R: 0.7

I understand the area of the turbine exducer should be ~50% larger in area than the comp. inducer.
The main concern I have on using the turbo would be the twin scroll on the exhaust side, as I have seen they aren't quite desired in this application with problem areas in thermal expansion causing cracks and poor aerodynamics.
Another concern I had was that the compressor inducer is slightly smaller than the average diameter that I've seen reading on this forum, I'm not too sure if this would be a problem with choking the compressor. 
My goal isn't really to create a powerful turbo, it's rather to create a running jet engine with a smaller budget. 
Again I'm not too experienced with this discipline so I could be wrong with some information.

Thank you everyone for the help in advance, I really appreciate it.

Chris.

[enginewhisperer]

I have built a working turbine out of a similar sized turbo, although it didn't have a twin scroll housing.

As you say, the twin scroll is not ideal for this application, but it should still work well enough to end up with a running engine.
With this sized compressor inducer it's not going to make a lot of power / thrust, but it's also easier in terms of starting air blowers and fuel supply.


The biggest job always ends up being the oil system - which is basically the same for any sized turbo.

[racket]

Yep , I'll second that .

also your "oversized" turbine wheel will power your comp very easily

[turboron]

nscurt, I agree that the oil system is the problem child on our DIY gas turbines. The Shurflo pumps a lot of us use are very sensitive to suction/inlet leaks as just one example.

Thanks, Ron

[nscurt]

Thank you everyone for the help. I'm going to go ahead with purchasing the turbo and designing the combustion chamber based on the dimensions. Hopefully I can engineer something up to increase the aerodynamics and decrease thermal concentration on the twin scroll center. Thank you again. I will be sure to post here if I have any remaining questions.

Thanks.

Chris.

[turbo51]

Hi I machined the web out as deep as I could