i know very little about hyd. any way i really don't know the internals of a "pressure washer" pump. but i guess it has some type of fixed displacement that relieves itself back to suction or has some type of varible displacement? i was wondering if varible pumps would help or do you need a constant displacement? i've done a little work with some multi-piston pumps with a swash (spelling?) plate and they are amazingly effecient (i thought). just stickin' my nose in
