SB Chevy zero cost oil pump power mods

[Dusty]

1234567891

[Regal502]

A few thoughts.....

How does this relate to BBC oil pumps. Can you provide insight into BBC oil pumps.

Also, how does this relate to the 'System One' style oil pumps that use that special "diffuser screen" pump cover?

And lastly,
How about a quick mention on oil pump 'end-clearances'. Seems this is an often overlooked clearance. In my personal experience, most Mellings pumps are LOOSELY assembled with as much as .009 end clearance!!!!!!! Most people don't bother to check, and will just install them out-of-the-box! EEKKKKK!!!

~Tom

[Regal502]

Does the same apply to the BBC oil pump?

What are your thoughts on the System Oil oil pump that has the "special" diffuser cover??

And lastly, oil pump end-clearances. In my experience, most pumps out of the box are sloppy at up to .009 end clearance. As I understand, end clearance should be .003-.004max. Thoughts?
I venture to say that most people probably just install them out-of-the-box as is. Yikes!!!!!

~Tom

[Billzilla]

I've been porting oil & water pumps for over a decade.

[rskrause]

Great article, thanks!

Richard

[old blue 75]

Dusty being on the oil pump subject, since the design change of the
melling m55 a couple of years ago to a week design what pump
would you guys recommend for a sbc.

Thanks old blue 75

[comp]

Dusty being on the oil pump subject, since the design change of the
melling m55 a couple of years ago to a week design what pump
would you guys recommend for a sbc.

Thanks old blue 75

old blue,,,,what did you end up doing ???

[Regal502]

What about mods to a BBC pump?
And lastly, oil pump end-clearances. In my experience, most pumps out of the box are sloppy at up to .009 end clearance. As I understand, end clearance should be .003-.004max. Thoughts?
I venture to say that most people probably just install them out-of-the-box as is. Yikes!!!!!

~Tom

[old blue 75]

old blue,,,,what did you end up doing ???

Unfortunately the engine in my truck was already built when I heard about the problems. It does have the new week design pump in it. X fingers it holds up.

[panic]

I've seen comments that returning excess pressure from the PRV back to the suction side feed passage sometimes causes cavitation?

Has any pattern that has been detected as to where to opening in the feed should/should not be positioned (intersect angle, size, how far away) to minimize or eliminate this?

Are there specific pumps know to syffer from this, where dumping the bypass to the pan is preferable?