First Attempt

[Brendon]

Hey Guys

Finally I have purchased a few Turbos to start a build - More on this later.
Something I have been wanting to do for a very long time.
I have no practical use for a turbine - Just wanted to prove I can & make some noise 

I've waited for a large turbo to come along, Something off a CAT or Cummins for example.
I had done a little research about 10 years ago into the DIY build but since then I see there is a lot more information
available and some very smart guys around including on this forum!

That is why I am posting here, I could do with a lot of help.

Firstly what to expect & what not to expect from the turbos I have managed to get my hands on.

I purchased 4 turbos off a Bell 47 Helicopter. I should be able to get two good turbos out of them.

Let me know your thoughts.
Cheers
Brendon

[barnyard]

Hi Brendon, welcome, and that's a nice looking turbo!
James

[racket]

Hi Brendon

Welcome to the Forum :-)

I noticed the turbo comp stage has a vaned diffuser with a radially bladed wheel without any swept back on the blading , this combination should produce a high efficiency and pressure rise , but will need to be a good match for the turbine stage otherwise the comp stage will struggle.

Could you provide some more details as to wheel sizes , inducer , exducer tip heights etc to give us a better idea of what we're dealing with .

There appears to be a mounting position on the comp cover outlet for some sort of "control" ...........bleed valve ??

Whereabout in Brisbane are you ??...........there are some turbine tinkerers up that way .

Cheers
John

[Brendon]

Thanks Guys

The port on the compressor housing is for an air density controller, I believe it controls the waste gate the same as usual but also accounts for temperature changes hence the term density, I will do some more research as I am also intrigued on how this works.
I will just make a cover plate and use for boost pressure. I considered using a bleed air system but I'm not sure this would work.

I will add a picture of the valve

I'm not to sure exactly what to measure but ill give it a go:

Compressor
Inducer:                     62mm
Exducer:                     98mm
Exducer Tip Height:      6.5mm
Overall Height:            25mm                               

Turbine
Inducer:                     74mm
Inducer Tip Height:      15mm    
Exducer:                     90mm
Overall Height:            35mm

Have added photos for reference - Please let me know if I have it right.

I live near Ipswich and work near Archerfield Airport
Would be nice to see one running in real life

I also have a Allison 250 I will most likely turn into a display! Missing far too many parts to make a runner! 

Cheers guys



Air Density Controller





















Here are a couple of Photos of the Allison

[racket]

Hi Brendon

Wheel sizes look like they'd be a reasonable match , turbine exducer at 74 mm is ~40% bigger area than comp inducer of 62 mm dia , this is a tad larger than necessary and could allow more flow than the compressor stage is designed for , it being a vaned diffuser with a 90 degree bladed comp designed for a specific flow, a lot will depend on the turbine scroll A/R ( nozzle) size , if its a "tight" size then it'll keep flow under control , but if larger then you might run into some problems that will require some lateral thinking to overcome , but in general I'd say go for it.

Ipswitch ......... my first kart build jetandturbineowners.proboards.com/thread/40/2-shaft-turbine-kart-build went there , Cameron has it with a different gas producer turbo installed.

Also my FM-1 engine jetandturbineowners.proboards.com/thread/576/fat-lady-fm-1 has been handed on to a long time turbine builder Chris ( jetturbine ) whose up your way, he's getting a kart build going , shoot him a PM :-)

Cheers
John

[Brendon]

All right I'm back. Time to get this turbine under way.

I've managed to source a length of 5" & 6" exhaust pipe @ 1.6mm thick. As per jet specs this should work but I have my doubts. Was thinking to make flame tube length approx 430mm long. Thoughts from the more experienced guys out there? I will be running on JetA1.

I have also managed to source an oil cooler and an electric power steering pump of a Mazda 3 for the oil system.

[racket]

5" plenty big enough for the flametube dia , 430mm long is a bit too much , bring it back a couple of inches , the "funnel" into the turb scroll can replace that couple of inches.