Originally Posted by Jarlaxle
Originally Posted by Kira
Could it be that "hot 'n loose" parts let these pumps spin with less resistance than we think?
I wonder if it's a high-volume/low-pressure design, for turbocharger cooling.
Makes sense to me. IIRC the GMC big block used crazy high coolant flow rate, and that was to keep temperatures more uniform across all cooling surfaces inside the engine. [I think it also did not run all coolant to the radiator.] High flow rate through the turbo has to be good too.
I wonder if some of that is to enable operation with 0W20 also? High flow rate, keep the bearings awash--and cool.
Originally Posted by SubieRubyRoo
16GPM with only 46psi of pressure sounds pretty high volume/low pressure to me... typical rule of thumb is 10psi per 1k rpm, and this is only 6.9psi/1k.
That rule of thumb was great... for small block Chevy's. Not necessarily applicable to every other engine out there. Briggs and Stratton engines run on zero oil pressure, as did Model T's and a host of other engines. My recollection is that some of the non-Chevy big blocks were content with a wisp of pressure at idle. Huge bearing surfaces not being asked to do much didn't require much pressure to get oil where it was needed.
