[Matt Gibson]

?..you run a 1450rpm pump on an engine running 1750. Direct drive.

[BDCS]

You get extra flow and wear the pump out a bit quicker. It should be fine

[Matt Gibson]

Thank you very much. 

[BDCS]

How many unloaders will this one have ? 

[Matt Gibson]

Its for the same machine. but i was thinking of adding another one because i like twisting kn0bs

i only asked because the pump thats on it is a hawk pump, pain to get spares cause they discontinued some pumps and there is some confusion about which seals/valves will fit. rather have an interpump on it. easy to fix.

[Mike Halliday]

Can you not just reduce the revs With the throttle ? A slight adjustment would drop the revs by 300rpm

[Matt Gibson]

Yeah i could do that actually, never thought of that. My machine is a fixed throttle, but im sure there will be a way to alter it.

[Kenny83]

will you be using a pulley to run it or a flexible coupling? as the interpump has a male shaft you would need to do one of those, if using a pulley though you could just get the pulley sizes to be correct for the ratio, ie. 1450 is about 82% of 1750, therefore your engine pulley wheel would need to be 18 percent smaller than your pump puley wheel.

[BDCS]

If you have enough meat on the pulley it would'nt take much on a lathe to get it right - don't forget its circumference not diameter

[Matt Gibson]

The machine im talking about runs a coupler. The hawk pump thats on it has the same size shaft as the interpump. my other machine runs a belt but that machine runs at 3000rpm so the pulleys are a bit of a size difference.

[Kenny83]

The machine im talking about runs a coupler. The hawk pump thats on it has the same size shaft as the interpump. my other machine runs a belt but that machine runs at 3000rpm so the pulleys are a bit of a size difference.

the pulley wheel will be more or less half the size as the one on the pump. Just pro rata the wheel to suit, ie. if you needed the pump to run at 1/4 the speed of the engine, make the wheel on the engine 25% the size of the one on the pump, like a 12 inch pulley on the pump and a 4 inch wheel on the engine amd so forth for any rpm desired
 

[BDCS]

C=Pi x D    Its a linear relationship

[Kenny83]

School stuff from what I remmeber