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Mark - The torque to turn the pump does seem low, but it all adds up at speed....just 4 ft.lbs of torque equates to about 3 HP at 4000rpm (just for illustration - I've NOT measured the torque at 4 ft.lbs)
Maybe shaft size will help put you in the ballpark for motive power requirements....the MFI pump cam is 17mm diameter at the bearing journals....electric motors of about 3.2HP are typically 16mm (5/8")....
In terms of measuring pump output - the specs are usually defined in terms of cc/400 strokes @ speed & angle.
With your belt drive setup (I'm assuming no clutch), you will need to divert the injector output away from your measuring cylinders until the pump is up to speed, then redirect into the measuring cylinders for measurement for 400 strokes, and then bypass the measuring cylinders again on the wind down. Maybe need to link into the tach signal to facilitate the counting of the 400 strokes aand use some solenoids to divert the flow ???
Hope this is useful info - not trying to be critical !!!
Regards
John
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