Free Power Turbine Design

[finiteparts]

Mitch,

Since that is a fairly large turbo, let's say the Holset HT60 is in the ballpark for similar oil requirements...see page 1:4 of:

www.myholsetturbo.com/manuals/HX60_HT60.pdf

The oil flow requirements are given as,

"
12. Oil pressure of 150 kPa (20 lbf/in2) must show at the oil inlet within 3 - 4 seconds of engine firing to
prevent damage to turbocharger bearing system. A flexible supply pipe is recommended.

13. The minimum oil pressure when the engine is on load must be 210 kPa (30 lbf/in2). Maximum permissible operating pressure is 400 kPa (58 lbf/in2) although 600 kPa (88 lbf/in2) is permitted during cold start up. Under idling conditions pressure should not fall below 70 kPa (10 lbf/in2).

14. Recommended oil flows for the turbochargers are 3 litre/min at idle and 3.5 - 4.5 litre/min above maximum torque speed.
"

So, if you are running the turbo at a high enough speed that it would have put the turbo operating condition when it was on the diesel engine to be above the max torque speed (I would assume this is the case, unless you are just idling), then you should be around 4.5 liters/min...or 1.2 gallons per minute. 750 in^3 tank volume (3.25 gals) means that the all oil would cycle through the engine every 2 mins 45 secs. Depending on how much heat it picks up, you might get a short while before you reach the max recommended oil temperature of,

"8. Normal oil temperature is 95+/-5°C (203+/-9° F). It should not exceed 120°C (248° F) under any operating condition."

A flow test would be a good way to see if you are in the range of suggested oil flow. Put a gallon in a bucket, pump it to another bucket and time it...then the flow rate is easy 1 gallon / time = flow rate.

Good luck!

Chris

[mitch]

finiteparts,
yes, I knew that it was not made for petroleum products... However I have a shurflo with a diaphragm made of the same materials, that sat with oil in it for about 8 months... and it still works!
and I never read the part about on/off times. Thanks for bringing that to my attention!
It is too late to return it now, as it has been several months since I purchased it and I have already used it on the turbojet. The part that scares me is the 140 degree limit, I guess I gotta keep that oil cool!
Hopefully I'll be able to head to the junkyard and get a nice power steering pump.

[Deleted]

lot of use in the uk have used ones similar to this

www.ebay.co.uk/itm/New-12v-Differential-Transmission-Oil-Cooler-Gear-Pump-Unlike-Mocal-and-Tilton-/280782675244?pt=Vintage_Car_Truck_Parts_Accessories&hash=item415ff39d2c

[mitch]

fininteparts,
I somehow missed your post yesterday... Thanks for the good information!
The odd thing is, with my old shurflo oil pump, which was good for 2.8 gpm, I was only able to keep about 15psi of oil pressure, with my bypass closed up all the way, which is why I switched over to my current pump, which is 5 gpm. and that bit about the oil capacity is helpful too, I will increase the size of my new oil tank, as I plan on extended length runs in the future.

andym,
I am confused as to how that pump would work, it says on the ebay page that it is only rated for 20psi? Or am I missing something (I am usually missing something)?

[Deleted]

Hi, we get lots more than 20 psi with oil, as much as 80 psi..... this is the one I and others are using, bigger than the one on ebay, but works well www.jamestowndistributors.com/userportal/show_product.do?pid=63912

[mitch]

that looks like a good alternative, but for the price, I think I will try to go with my power steering setup. It will be larger, but will be considerably cheaper.

[miuge]

We have bad experience of a cheap 12V gear pump (similar to andy's link). Pump had an unreliable overload relay which apparently didn't like heat and/or more than 30psi pressure. Later we melted pump's plastic end cap. If you decide to buy a pump, I suggest you to pay little more to get a decent one!
There's also electric powersteering pumps available from Toyota, Volvo, Peugeot and Opel if I remember right. Could be worth testing too

[mitch]

miuge, thanks for the comment. I noticed that you were having oil pump problems in your thread, which is something I would like to avoid!
After some searching, I found that electric power steering pumps tend to be quite a bit more expensive than old belt driven ones.
I am thinking about getting this one, as it would only be $5 more than pulling one myself at the local junkyard, and would save me the trip, and leave a good amount of money left over to buy a 12v motor to power it. www.tomsforeign.com/p-1294-power-steering-pump-mitsubishi-galant-1994-1995-322802.aspx?CAWELAID=400002250000125145&CAGPSPN=pla&gclid=Cj0KEQiAiuOlBRCU-8D6idaPz_UBEiQAzTagNLK2KSq30-b1eLUUHCuntxm6kO3HZMlQjz2RxVSa5QEaAqD-8P8HAQ

Does anyone know if these power steering pumps are self priming?

[Deleted]

Jan 16, 2015 5:53:58 GMT -5 miuge said:

We have bad experience of a cheap 12V gear pump (similar to andy's link). Pump had an unreliable overload relay which apparently didn't like heat and/or more than 30psi pressure. Later we melted pump's plastic end cap. If you decide to buy a pump, I suggest you to pay little more to get a decent one!
There's also electric powersteering pumps available from Toyota, Volvo, Peugeot and Opel if I remember right. Could be worth testing too

The Second link I posted is the pump I used on the drag jet bike ( www.facebook.com/dragjetbike?ref=hl ), hx turbo kart ( youtu.be/WHEHMFbEH8I?list=UUwCPYr6ZI4dx9pl8FHrorCw ), peal kart and I think anders is using them, along with others in the uk, yes the cheap one from ebay are not to good, but it was an example, Jabsco are the better ones ,

[Deleted]

We also did some testing on electric steering pumps, flow was not that good and they got hot quick.... oh yes the twin turbo mini use jabsco gear pump and has ran a treat

[miuge]

Hi Andy,

Yep I meant the "ebay no brand" is not a good choice as a pressure pump without modifications.
I've heard those Marco pumps are good, I thought earlier it was too expensive for our project but if I'd have to choose now I would definitely get a proper one despite it's price

[Deleted]

Hi

its worth spending a little more on an good oil pump when you can, the first jabsco I brought 5 years ago has been on 3 projects and I gave it to a mate to use on his

[racket]

Hi Mitch

Steering pumps often need internal modifications to get them to run as we need them to run , when the mods are done they can be good pumps .

Cheers
John

[pitciblackscotland]

Hi
Have you thought of using a vw oil pump? like this on ebay item number:151527609606

Cheers,
Mark.

[mitch]

Mark, that is a good idea, I have not thought about that.

The only problem- those are made to mate up to the engine block, and seal to the various oil passages that way. How would I go about connecting plumbing to this type of pump? Would it be possible to thread those oil ports machined into the pump?

Thanks,
Mitch