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Tractorsport Flowbench Forum Archive • View topic - Hydraulic pump as a dyno load

Hydraulic pump as a dyno load

Postby WPH » Mon Jun 16, 2008 8:00 pm

Any pointers at this direction? I'm thinking about using a rotating pump housing and a load cell to measure torque. Mostly for inline and flat 4 engines NA below 300bhp.
Pekka
WPH
 
Posts: 81
Joined: Thu Oct 18, 2007 3:20 pm
Location: Kuusamo, Finland

Postby Tony » Fri Jun 20, 2008 7:36 pm

It should work, only problems might be cooling the oil. The temperature rise of oil will be very roughly double that of water, and where hot water can just be dumped, you need to cool and recover all that hot oil.

Only other complication I am aware of, might be reaction forces from the flexible hydraulic hoses. These will likely be running at very high oil pressure, and the hoses themselves will generate forces that may influence the measured torque reaction of the pump. There are ways around this, but recognizing the problem in the first place is half the battle.

If you already have a hydraulic pump, it is probably worth a try. If not, a suitably large and robust pump will certainly not come cheap.

I have seen this idea used successfully testing smaller outboard motors, and smaller air cooled engines, but never at anything like 300 Hp.
Also known as the infamous "Warpspeed" on some other Forums.
Tony
 
Posts: 824
Joined: Sat Dec 03, 2005 12:34 pm
Location: Melbourne, Australia

Postby WPH » Mon Jun 23, 2008 7:28 am

I managed to dig up some info about pump capacities needed,
minimum would be closer to 500-600 litres/minute@200bar pressure and the price is astronomical unless you can find a second hand unit.
Hydraulic fluid tank capacity would have to be bigger than 600litres and a cooling system capable loosing all the HP through the system.

Conclusion is for small motors only...
Pekka
WPH
 
Posts: 81
Joined: Thu Oct 18, 2007 3:20 pm
Location: Kuusamo, Finland


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