460 oil pressure eye-opener!

[FWB]

the pan isn't the only factor in the 460 loosing oil pressure. the 460 is essentially a truck motor designed for a mild hydraulic cam, low rpm usage. when a high lift cam is introduced the oiling holes in the lifter bores get exposed on max lift and full oil pressure is lost thru the passage resulting in the pan quickly getting sucked dry. extra capacity helps, accusump helps but the source is usually in the lifter galley. when using solid cams in the 460 it is often wise to bore out and bush the lifter bores to eliminate the problem. high lift hydraulic cams also expose the galley. a restricter is often needed.

just my two cents, from wiping out bearings at the dragstrip and finally after two motors finding the problem on the test stand.....

[Tom Wells]

Elder,

Please forgive the lateness of the reply to your question - I just saw the question!

My solution (?) is the 3-QT Accusump. Guess who makes it? Canton! What a coincidence.

Anyway, it works fine - no more pressure loss in the turns on various tracks. It did get to where the loss is noticeable on the street, but keeping the Gs below .3 seems to prevent any problems - particularly with howly street tires and law enforcement officers...

I would not do any spirited cornering with a 460 without an Accusump. That's my story and I'm sticking to it.

Tom

[mdross1]

Originally Posted by FWB

the pan isn't the only factor in the 460 loosing oil pressure. the 460 is essentially a truck motor designed for a mild hydraulic cam, low rpm usage. when a high lift cam is introduced the oiling holes in the lifter bores get exposed on max lift and full oil pressure is lost thru the passage resulting in the pan quickly getting sucked dry. extra capacity helps, accusump helps but the source is usually in the lifter galley. when using solid cams in the 460 it is often wise to bore out and bush the lifter bores to eliminate the problem. high lift hydraulic cams also expose the galley. a restricter is often needed.

just my two cents, from wiping out bearings at the dragstrip and finally after two motors finding the problem on the test stand.....

Makes me wonder how much lift are you using to push the lifters that far out of the bores.Over .600?