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Post by racket on Dec 7, 2016 15:06:12 GMT -5
Hi Mitch
Subaru EA71 engine
Cheers
John
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Post by enginewhisperer on Dec 7, 2016 17:26:48 GMT -5
Usually the pumps designed to mount inside the engine don't have any sort of seals on the shafts, so unless you mount them in the oil tank they will leak a lot  That Audi pump could be pretty simple to mount in an oil tank though with a scooter motor driving it. |
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Post by pitciblackscotland on Dec 7, 2016 18:48:12 GMT -5
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mitch
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Joined: August 2014
Posts: 285 
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Post by mitch on Dec 7, 2016 19:51:06 GMT -5
Thanks for the help everyone!
That VW pump looks nice, except making the bottom cover might be difficult. So far with this build, the oiling system has been by far the hardest part for me.
That audi pump looks like it would be the best bet, and I could modify my oil tank to let the pump sit in it. I have so many options! None of them seem easier than the other, though
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Post by pitciblackscotland on Dec 7, 2016 21:19:45 GMT -5
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mitch
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Joined: August 2014
Posts: 285
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Post by mitch on Dec 9, 2016 0:30:15 GMT -5
All of those eBay pumps look like they would work! And I had considered a power steering pump too, but I'm not sure if they have the flow capacity for my turbos. At one point a few years ago I had a 12v shurflo pump rated at like ~1.8-2.8 GPM, and it could not flow enough oil to make any sort of pressure on my gt37 turbo. Would a power steering pump flow enough for that? I know they can work at very high pressures, I'm just not sure what the flow rating would be on one. |
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Post by enginewhisperer on Dec 9, 2016 0:58:09 GMT -5
I think the power steering pumps have a pretty high flow rate if you run them at high rpm.
On small turbos I've found they have plenty of flow even running quite slowly.
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Post by pitciblackscotland on Dec 9, 2016 3:51:15 GMT -5
All of those eBay pumps look like they would work! And I had considered a power steering pump too, but I'm not sure if they have the flow capacity for my turbos. At one point a few years ago I had a 12v shurflo pump rated at like ~1.8-2.8 GPM, and it could not flow enough oil to make any sort of pressure on my gt37 turbo. Would a power steering pump flow enough for that? I know they can work at very high pressures, I'm just not sure what the flow rating would be on one. Yeah i had a 12v shurflo pump that wasn't good enough for the big rotomaster turbo i was using, so went with a power steering pump work out really well. One thing i notice if i increase the rpm on the pump the pressure would drop so kept the IC engine at low RPM. Here is a vid on the test i did back in 2009 www.youtube.com/watch?v=IOGBhX4HpjU |
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mitch
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Posts: 285
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Post by mitch on Dec 9, 2016 13:55:25 GMT -5
I'll try the power steering pump option then, I have one sitting in my garage off of my Mazda that should work. I'll try to hook it up this weekend and post the results! I'll probably just run the pump at the same speed as my 24v motor, around 1,250 rpm
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mitch
Senior Member
Joined: August 2014
Posts: 285
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Post by mitch on Dec 16, 2016 16:21:42 GMT -5
I was looking at my extra power steering pump, and realized that it is fairly complex compared to normal power steering pumps, it can vary pressure to the rack based on vehicle speed. I will be trying one last time to make my small block pump work. I am making a new pulley for it, which will lower pump speed, hopefully lowering the power consumption from the motor too. I have also shortened the pump's drive shaft, which will lessen the chances for misalignment and belt deflection. Hopefully this last small block attempt works!
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mitch
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Posts: 285
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Post by mitch on Dec 21, 2016 0:15:25 GMT -5
I tig'd the oil outlet pipe into the oil pump, instead of mig welding it. I am not the best tig welder, but that pump body is very difficult to weld to. It is some sort of cast iron, that is very porous and bubbles when welded. We'll see how this weld holds up  |
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mitch
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Joined: August 2014
Posts: 285
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Post by mitch on Dec 21, 2016 16:48:28 GMT -5
My new injector came in the mail today, it is a stainless steel 5 gallon per hour, 45 degree solid spray injector. I also re assembled my oil system with the re welded pump and new, larger pump pulley to lower the stress on the motor and decrease oil pressure a bit. I will hopefully do a test run pretty soon, assuming that my oil system testing goes well. I currently have the engine set up with the free power turbine installed and plumbed, so I am considering doing the testing with the free power attached still. What does anyone else think of this?  |
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Post by Johansson on Dec 21, 2016 16:57:37 GMT -5
As long as you keep the freepower turbine wheel braked down somehow, you don´t want an unloaded freepower wheel at the end of a running gas turbine... |
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mitch
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Post by mitch on Dec 21, 2016 17:17:57 GMT -5
Ahh that is a good point! I never thought of that! Think I could just block off the compressor outlet on the free power, to act as the "brake"? As of now the free power is just a fully assembled st-50.
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Post by racket on Dec 21, 2016 19:32:05 GMT -5
Hi
Be careful , all that can/might happen with a blocked off comp housing is the same bit of air keeps getting spun around , theres no load on the comp from fresh air being "processed" .
I'd simply let the comp wheel process air and maybe fit a jet nozzle on the comp scroll outlet so that the comp will build pressure and consume its turbine wheels output , I know this does work .
If you make the jet nozzle a bit smaller than the freepower comps inducer, maybe 1/2 inch smaller, it'll put some backpressure on the system
Cheers
John
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