Starting out with a VZ21 and looking for a little guidence

[drumwilldrum]

Hopefully these pictures upload: 

[drumwilldrum]

Hi Thomas,

Just to add; yes you need to remove the wastegate actuator and find a way of sealing the wastegate hole - I have a blanking plate over the entire rear opening with a hole matching the turbine outlet, then have used a shim between the wastegate cover and the blanking plate to prevent it from opening.

I have tried to start with compressed air at 80psi from a shop compressor, blowing through a nozzle directed tangentially at the compressor (you can see the pipe in the pictures) - and failed to get over 3psi at P2. I have also tried a leaf blower sealing against the compressor inlet (which John notes in other threads will not work) and this struggles to generate any real rpm increase. I will move onto trying air impingement against the turbine next.

Thanks
Will

[racket]

Hi Will

Could you please do a Build Thread , I'm certain there'll be interest in how you've done things and the mods required , also various test results .

Cheers
John

[tomahawktom]

Alright, here's an update of where I'm at. I've been busy at work so progress has been slow, but I'm getting back on track now.

Here's a mock up of what the build should look like that I made in SolidWorks. The flame tube and burner cover are both from some stock tubes I took from a rack at work (with permission of course). Their both Stainless Steel, and I know for sure the flame tube is 304/304L since it didn't have its label washed off quite yet. 

(90 Degree bend will naturally be cut to length so it isn't protruding. Flame tube and burner casing highlighted for clarity.)

The rest of the raw material that I need, such as the 90 Degree bend, and small tube coming from the compressor/into the turbine are from McMaster and are also Stainless Steel. Thankfully, my decision to do this project with a small turbo to save money on manufacturing everything is paying off hahaha.

I'm also wanting to do some Data Acquisition, specifically for P2, P3, and TIT. The pressures shouldn't be too hard since I can likely just use the holes that the waste gate was using for two pressure transducers, though I am concerned on how to implement a thermoplug between the burner and the turbine without creating a weak point that could let the gases escape.

Lastly, I'm thinking of the injector since that's the next step after I get all the materials cut and welded together. Axial injectors are out since that will shoot the propane down the burner faster than it can properly mix and fully burn, so it's onto a radial injector. Does anyone know of a radial injector that is off the shelf? I can't quite find one after a little bit of searching, but my solution will probably be something like copper pipe or a bolt with holes drilled into it.

[tomahawktom]

Note to self: Take wider screenshots

[racket]

Hi

Place your thermocouple downstream of the turbo so that its in the "normal" position , the temperature will be lower than TIT , but you won't need to worry about the thermo going through the turbine wheel in the event of it failing .

With such a small turbo , your propane injector will need only 6 radial holes in a length of metal tubing with the end sealed to prevent axial injection, the holes will need to be 1mm dia or smaller so as to produce a decent stream of fuel

Cheers
John