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Post by racket on Dec 19, 2014 2:39:41 GMT -5
Hi Mitch
Yep , it "unloads the bush , you won't need a massive ball bearing , but don't go for the smallest option either , the hydrostatic bearing at the turb end is fine
Cheers John
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mitch
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Posts: 285
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Post by mitch on Dec 19, 2014 14:31:31 GMT -5
Okay, I'll look around for a decent ball bearing for that part of the shaft then. Heading to the store to get some 60 grit flap discs and dust masks, gonna try to remove the gunk and rust from the ST50 turbine housing and clean it up a bit
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mitch
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Posts: 285
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Post by mitch on Jan 13, 2015 16:50:37 GMT -5
currently working on designing a new oil tank that will have the capacity to feed both the gas producer bearings and the free power bearing, while maintaining a safe temperature. I don't want to make the reservoir too large, my current cylinder design (just for testing the gas producer) has about a 150 cubic inch capacity if filled to the brim, which obviously will never happen due to expansion from heating the oil. I am thinking about a 750 cubic inch rectangular tank, that should be enough to meet my requirements. Shouldn't be too bulky either.
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Post by racket on Jan 13, 2015 17:28:52 GMT -5
Hi Mitch
That should be big enough , say ~500 CI of lube, leaving plenty of space for frothing etc etc .
Cheers John
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mitch
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Posts: 285
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Post by mitch on Jan 13, 2015 22:59:06 GMT -5
Thanks for the input racket. I will probably have to invest in a second pump to supply oil to the free power, as I don't think my current 5 gpm pump will be able to keep up with supplying oil to 2 fairly large bearing cores!
I'll be making it out of 10 gauge mild steel, as I'm not worried about rusting since it will be filled with oil, mild steel is cheap, and I only have access to a mig welder without a spool gun, and mild steel fittings are cheap too.
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Post by racket on Jan 13, 2015 23:04:11 GMT -5
Hi Mitch
Your 5 GPM pump should handle both , wait until you have it running before worrying about fitting a second pump .
Yep , mild steel is all I've ever used for oil tanks , it gas welds beautifully :-)
Cheers John
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mitch
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Joined: August 2014
Posts: 285
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Post by mitch on Jan 14, 2015 8:35:56 GMT -5
Racket, in theory, yes you would be correct, the 5 gpm pump should handle both... However I bought a "demand" pump, which still confuses me. It will change it's flow based on pressure drops in the line or something like that. Some times it will push 45 psi + to the bearings with my bypass valve closed (good old fashioned mechanical pressure control), and other times the "demand" brain kicks in and will only make about 25 psi at the bearings. I gotta find a way to take the "demand logic" part of the pump out.
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Post by racket on Jan 14, 2015 15:15:24 GMT -5
Hi Mitch
Could you supply a bit more info about the pump ..............make , model etc .
Cheers John
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mitch
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Joined: August 2014
Posts: 285
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Post by mitch on Jan 14, 2015 17:41:44 GMT -5
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Deleted
Joined: January 1970
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Post by Deleted on Jan 14, 2015 17:49:07 GMT -5
Hi..... not sure about diaphragm pump, gear pump would be better, :-)
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mitch
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Joined: August 2014
Posts: 285
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Post by mitch on Jan 14, 2015 18:59:39 GMT -5
Unfortunately I already bought the diaphragm pump... However I am considering heading to the junkyard and pulling a power steering pump and coupling it to a 1/2 HP or so electric motor, if I (we) can't find a solution to the "demand" problem... The delavan would make a nice water injection pump in the future though!
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Post by racket on Jan 14, 2015 19:40:15 GMT -5
Hi Mitch
It looks like theres only the couple of wires coming out of the pump , are the "electrics" that are giving the problem inside the motor ?
Cheers John
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mitch
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Joined: August 2014
Posts: 285
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Post by mitch on Jan 14, 2015 21:00:23 GMT -5
I am not sure, I think it the part of the pump that deals with determining the "demand" part. Which I have no idea how it works
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Post by racket on Jan 14, 2015 21:16:28 GMT -5
Hi Mitch
Theres not much info on the Net about the "electronics" or how to bypass them , I guess the only way would be to get inside the pump and find the pressure switch and disable it.
Maybe you need to make sure theres no plumbing restrictions either on the supply or suction side then have your "bypass" carefully adjusted .
Sorry I can't help any more , I haven't had any personal dealings with the Delvan pumps
Cheers John
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Post by finiteparts on Jan 14, 2015 21:43:41 GMT -5
Hi Mitch, According to the instructions for that pump, www.delavanagpumps.com/wp-content/uploads/2014/02/PF-5800-5900-Install.pdf"6. Do not pump gasoline or other flammable liquids. Pump head materials are designed for use with water only. Do not use with petroleum products. 7. Do not assume fluid compatibility. If the fluid is improperly matched to the pumps’ elastomers, a leak may occur." My team member on our Senior design project bought a diaphragm pump for the oil system and it worked great for a few minutes, till the diaphragm swelled due to incompatibility with the hot oil and dropped out oil pressure in the middle of a run. My guess is that your's would suffer the same fate. Also, if you read the electrical part of the manual, it states... "1. The 5800/5900 series pumps are designed for intermittent duty. Make sure that “OFF” periods are sufficient. Refer to Rapid ON/OFF Operation. Consult the factory for particular data and design criteria." That doesn't seem like even if it worked, that it would work for long. Can you return it? Since that is a fair bit of money for a pump that doesn't fit your needs. The power steering pump is a good solution. You can incorporate a bypass valve since the steering pump flow rate might (?) be too large. The Holset service manuals are good resources for getting an idea of the oil flow and pressure required. Good luck! Chris
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