Newbie looking to start a Turbocharger Jet build

[jkmotum]

Hi All,

I've been reading here off an on since being told about this forum by Smithy1 whom I met at a local event in Newcastle NSW some years ago now (Checking the date stamp on some photos and video I took of his Go Kart, Dec 2016! wow, that was some years ago) and have decided to have a crack at this myself.
I've been watching the usual YouTube videos and reading on here, and have seemed to grasp a reasonable understanding on the basics/fundamentals. 

The biggest thing I'm questioning is turbocharger choice. The general consensus I've gathered is the bigger the better, for thrust and ease of getting the thing to run. That said, this is going to be built to a budget and isn't being made to break any records or even power a vehicle or device, just simply to get one running on a bench for the fun of it. Now that I've outlined my intended use, then comes turbocharger selection. Again from what I've read, diesel engine turbos seem to have desirable characteristics that lend well to this use, however I haven't had much luck finding one for sale, or I'm not looking in the right places or for the right thing - They all seem rather small off 4cyl-6cyl commercial vehicles or well into the thousands of dollars. It's also likely that this is just what you have to outlay to get the most suitable turbocharger. 

This is an option I'm looking at for a few reasons, namely being price & physical size. The thing that concerns me is that it's a twin scroll design - is this a problem? And are these things best avoided because of the price and related build quality. 

www.ebay.com.au/itm/Turbo-GT35-GT45R-T4-twin-scroll-1-00-a-r-Exhaust-70-a-r-compressor-Billet-wheel/153853061221?hash=item23d25b6865:g:a4oAAOSwiiheXwVC&frcectupt=true

Or this one, which seems to not have this potential problem
www.ebay.com.au/itm/153471383778?ssPageName=STRK%3AMEBIDX%3AIT&fromMakeTrack=true

If all this has been discussed in a previous thread that I haven't found, then a link would be great and I'll continue reading over there.

Of course any other input would be great,


Thanks all!
Jacob

[racket]

G'day Jacob

That turbo isn't probably the best choice , the comp inducer is bigger than the turb exducer .

Where are you based ??

I'll checkout Oz Ebay for you tomorrow to see what I can find

Have you looked here for info jetandturbineowners.proboards.com/thread/680/diy-turbines just click on the icons

Cheers
John

[jkmotum]

Hello John,

That is something I did overlook, Inducer to Exducer size...

Thanks for your reply, I've been watching your videos on YouTube lately & reading your forum contributions, awesome work!

I'm in Maitland NSW (near Newcastle NSW).

I'll have a look through those tomorrow, thanks for the thread link!

Cheers,
Jacob

[pitciblackscotland]

G'day Jacob,
Finding a truck turbo won't be cheap and if it is a cheap one you may need to rebuild it. I have a rebuilt ST 50 turbo i can sell to you. Send me a PM and we can go from there for price and freight to you.
The turbo had the housings remove to save on shipping cost from the US, might be a good idea to get Smithy to rebalance before assembly.

Cheers,
Mark.

[racket]

Hi Jacob

Take up Marks offer, the ST50 is often used , its a fairly old design but theres lotsa info on its use .

I'm just up the Pacific Highway to the south of Port Macquarie .

Yep , read through the Link , then ask about anything you have doubts about :-)

Cheers
John

[enginewhisperer]

I was there helping Smithy with the kart at Newcastle in 2016

I probably have a suitable turbo or two kicking around, and I'm on the Central Coast.
If you just want to make something work, I have a small turbo which I've had working as a turbine engine before.
I also have a couple of bigger truck turbos.

[jkmotum]

Hi Folks,

Thanks for the help! I've just direct messaged Mark regarding his ST50...

Not too far up the highway from me! Hope the rain hasn't been too destructive to your place John, it's been pretty terrible around Taree and its surrounds...

enginewhisperer- fancy that, I probably spoke with you too then! If for whatever reason things don't work out with Marks offer, i'll get in touch. Thank you! Same goes for you too, hope the rains haven't been too brutal to your place either.

Cheers,
Jacob

[racket]

Hi Jacob

We survived OK , I'm well above the Camden Haven River, just a very muddy backyard after 800mm of rain in a week :-)

If you look through the Link I gave you , a lot of the calcs were for a roughly ST50 sized turbo .

All the best with the build , any problems , we're here to help out with suggestions.

Have a look at R C Dons page www.rcdon.com/html/gr-7_turbojet_engine_project.html

Cheers
John