Pressure Washers

[Ed Van Scoy <edvs@idt.net>]

I am shopping for a pressure washer, but am not certain where the line
between adequate and inadequate is. I will use it primarily for cleaning
engines, off-road vehicles etc. My only reference is the "quarter car
wash", which is too much for my purposes, but not by much. Does anybody
know what the ".25" units put out in PSI & GPM? Ant recommendations out
there?
Thanks,
Ed