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roverman
Art Gertz
Winchester, CA.
(2870 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

A Different Kind of Dyno...
Posted by: roverman
Date: November 28, 2017 04:19PM

Ex-military centrifugal pump, reportedly for transferring diesel fuel, hearsay rating is 1,100 gpm. @ 1,400 rpm., formerly powered by 4 cyl. Perkins turbo diesel. Pump will be transferring sea water. Plan is to epoxy coat the cast aluminum internals. Re-power is scheduled to be a Lotus 907, na. motor. Why ? Light, known history/performance and I have it. Dedicated cooling system(rad/etc). Thought is sea water has less viscosity than diesel, so pump will max perform at higher rpm. ? Gas motor will want higher rpm. Gear reduction if I must. Thought is to monitor output flow vs temp rise, in the pump housing or pressure gage ? Your skilled thoughts please ? Thanks, Art.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5354 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: A Different Kind of Dyno...
Posted by: BlownMGB-V8
Date: December 04, 2017 11:28AM

Keep your inlet as short and large as possible and watch for signs of cavitation.

Jim


roverman
Art Gertz
Winchester, CA.
(2870 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: A Different Kind of Dyno...
Posted by: roverman
Date: December 04, 2017 06:24PM

Thanks, anybody else ?


88v8
Ivor Duarte
Gloucestershire UK
(521 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: A Different Kind of Dyno...
Posted by: 88v8
Date: December 07, 2017 04:25AM

If you can do it without too much bother.... but seawater pumps are made of stainless and bronze..... I would be concerned that when the epoxy coat starts to fail, the seawater will destroy the internals... and then you will need to substitute it with a pump that's built for seawater.
As Jim hints, if it cavitates due to excessive speed, that will happen all the sooner. The casing as well as the moving parts will be affected.

Cavitation would be exacerbated by inlet vacuum, hence the need to keep the inlet big and short, I guess you may need a trash rack and that can cause cavitation issues if it clogs.

Needed HP or rather torque, will depend on delivery pressure.
So that 1100 gpm rating (1500 ft3 / 42m3) needs to be qualified.
[www.metaris.com]

Some pumps, the flow falls off markedly as back pressure increases.
Also, it may not develop much suction, may need to work from a static head.

Uncharted water. Fun if you have time and can afford to throw it all away if no go.

Ivor


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5354 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: A Different Kind of Dyno...
Posted by: BlownMGB-V8
Date: December 07, 2017 12:02PM

Yes, it would be best if you could mount the pump below sea level. I know, go buy a barge and mount it to the floor ;) Failing that, maybe you could have a large inlet tank (accumulator).

Jim


roverman
Art Gertz
Winchester, CA.
(2870 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: A Different Kind of Dyno...
Posted by: roverman
Date: December 07, 2017 02:52PM

Thanks for info, so far. Since this for primarily water transfer, "maybe" lift 10' max ? Pump has (2) x 4" inlets/outlets and (1) 6" in/out. Will likely use the (2) x 4"( we have mega 4" fire hose). Inlet screen is an approved, large surface area, friendly to fish, design. I suspect a pressure gage ,on discharge side of centrifugal pump housing, should tell the story ? With 97 hrs. on the clock, since new, and at $500, all-in, we will move A LOT of water, before we whimper. Onward, art.


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