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Post by dieselguy93 on Oct 10, 2022 17:00:05 GMT -5
Hello guys, I’m new to the forums but have been reading posts on and off for about a year. I had messed around with a simple wood furnace style setup and used a hybrid t3/t4 turbo and it worked for it pretty well honestly. So I came across some videos of diy turbocharger turbojets using propane and diesel and decided I wanted to go that route. Did tons of research and came across these forums and found the instructions and to jetspecs I went. I build a combustor and bolted the turbo up added oil setup and propane(I only want propane for now) and tried to start it. Never could get close and figured I messed flametube up to which I was correct. So I cut it apart and redid my jetspecs calculations and welded all holes shut and rebuilt it. When done I tried a test run and tried for about 2 days on and off to run it. It would get very close but even after using a 6.5 horsepower shop vac the compressor acts like it’s trying to surge and rpm starts to slow unless I pull shop vac out of inlet a bit(but it won’t self sustain). If left in inlet she will continue to try and surge and will almost put flame out.
On to my questions….
1. Is there any certain turbo that’s tried and true and a easy build for beginners?
2. What ar is preferable? As well where are the limits for propane gas?(I want to go diesel in the future but want to get a good fine tuned propane one running first)
I appreciate anyones help here. Also I would like to stick with more common chargers because as of now I’m gonna mostly use the cheaper stuff (maxspeedingrods, ineedup, Chinese eBay.) I have some good turbos laying around but would like to figure it all out before I ruin a good Garrett or holset charger. Thanks again for anyones help.
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Post by enginewhisperer on Oct 10, 2022 17:11:46 GMT -5
the main thing is any turbo with a larger turbine outlet than the compressor inlet is a good start.
In terms of small turbos, I had good success with a mitsubishi TC06 (I think), from a Cordia or Starion. It has a huge turbine compared to the compressor.
Most smaller turbos, especially from petrol engines, are designed to work with a wastegate and undersized turbine which doesn't really suit a gas turbine engine setup.
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Post by dieselguy93 on Oct 10, 2022 17:16:42 GMT -5
Also in case anyone is curious here are the specs of my cheap eBay hybrid I tried.
Compressor Inducer-2.130” or roughly 54mm.
Compressor Exducer-2.755” or roughly 69mm.
Compressor Inlet-3”
Compressor outlet-2”
Trim-60.
A/R-.50
8 Blade T4 compressor.
Turbine Inducer-2.570” or roughly 65mm.
Turbine Exducer-2.205 or roughly 56mm.
Trim: 73
A/R: .63
Exhaust inlet: T3 4 bolt flange
Exhaust outlet: 2.274"
12 Blade Turbine Wheel.
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Post by dieselguy93 on Oct 10, 2022 17:18:41 GMT -5
Okay enginewhisperer I’ll look it up and see if there is anything available that the wife won’t murder me for ordering lol. Thank you.
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Post by enginewhisperer on Oct 10, 2022 17:52:19 GMT -5
otherwise finding a second hand truck turbo is the best bet.
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Post by dieselguy93 on Oct 10, 2022 17:57:08 GMT -5
I have a Garrett GT3782VA as well as a Holset HE431VE. Both of which are too large for just propane right? I'm sure they would start and run on it but i'd need to go with diesel or kerosene after starting and preheating with propane right?
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Post by racket on Oct 10, 2022 18:35:13 GMT -5
The bigger turbos can be made to run by increasing the propane tank volume, using two BBQ cylinders , one to get up to speed and then open the second to get up to full power :-)
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Post by racket on Oct 10, 2022 18:52:01 GMT -5
One other thing , BBQ cylinders have "safety devices ??" inbuilt in some countries , these prevent their use , they'll only provide a limited fuel delivery before cutting off supply , even if the cylinders don't have them , the use of a pressure regulator to control fuel flow isn't recommended , simply use the cylinder valve for throttling .
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Post by dieselguy93 on Oct 11, 2022 23:29:14 GMT -5
Sorry it’s been a long day at work. Good news is during work I also figured out which fittings I needed to do away with regulator on bbq tank. And also made a shaft reducer after my shift for a better oil pump I found that the pump itself is adjustable and will even pressurize an ep460 gear oil to around 100 psi so it’s about to have a easy retirement running motor oil. I’m gonna try this hybrid again most likely tomorrow. I think it will start with higher pressure from fuel. It may not run well or may run hot but I have a type k for setup to keep track of my egts. As well as a small mirror placed off to the side so I can see the turbine without putting myself in the danger zone. Already learned a lot and hope to learn a bunch more and get a proper little charger and get a good running engine. Thank you guys. Especially you John.
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Post by racket on Oct 12, 2022 0:15:20 GMT -5
Yep , we need full propane cylinder pressure as once the engine is producing "boost" the fuel pressure needs to overcome that before it can enter the engine .
Without a jetnozzle or any restriction downstream of the your hybrid, it should run at modest turb temps
Cheers
John
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dieselguy86
Veteran Member
Joined: September 2014
Posts: 186 
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Post by dieselguy86 on Oct 14, 2022 7:24:08 GMT -5
That he431ve would work good, better than the gt37. The holset is easy to lock the vanes full open, and is alot less restrictive than the gt37 vanes.
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Post by dieselguy93 on Oct 14, 2022 22:40:45 GMT -5
Okay I may give it a shot. But I believe it’s a bastard flange. Doesn’t match to t3 t4 or t6. Kinda odd.
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