Need pump motor help

[Rimrock]

I would recommend a brushless motor, outrunner, for it's compact size and relative high power. Outer diameter in the area 36 to 42 mm. They are marked e.g KV800 which means 800 rpm for each 1 Volt, so that is about 9600 rpm at 12V (unloaded) A high end pump from e.g Premacon runs in the area 2-4000 rpm (there is a planetary gear between pump and motor) A DIY pump may need more than double that rpm because of more internal leakage than a pump made to industrial standards.

[crusher]

Thanks for your reply rimrock, good info, I am attempting to make my own pump, will post the results.
Terry