oil pressure ? oil brand and wieght?
#1
Member
JUNIOR BUILDER
Thread Starter
Join Date: Nov 2004
Posts: 90
oil pressure ? oil brand and wieght?
I HAVE 406 SBC THAT HAS SOME TIME ON AND OFF TRACK. MY SITUATION IS IT STARTS UP WITH 70PSI OIL PRESSURE AT 1000 RPM IN PARK WITH VALVALENE 10/40 BUT WHEN IT WARMS UP TO 180-200 IT HOLDS 25 OR LESS. IS THIS COMMON AND SHOULD I RUN LIKE A STRAIGHT 30 SYNTHETIC?
IF SO WHAT WEIGHT IS BEST AND WHAT BRAND ?
IM PARTIAL TO MOBILE ONE BUT OPEN FOR SUGGESTIONS.. THANKS RJ
IF SO WHAT WEIGHT IS BEST AND WHAT BRAND ?
IM PARTIAL TO MOBILE ONE BUT OPEN FOR SUGGESTIONS.. THANKS RJ
#4
Senior Member
MASTER BUILDER
Join Date: Dec 2005
Location: alberta,canada
Posts: 166
straight 30 wt syn will make your low oil pressure worse you need heavier oil like 20-50 or change the oil pump spring to a high pressure....your oil pressure is wayyyyyyyy to low for my likings.
I use 5-30 mobil1 with a high pressure spring in my oil pump and when i start the car i have 70 to 80 psi and when i am at the end of the 1/4 and hot i am at 50 psi never seen it lower then 45 psi
I use 5-30 mobil1 with a high pressure spring in my oil pump and when i start the car i have 70 to 80 psi and when i am at the end of the 1/4 and hot i am at 50 psi never seen it lower then 45 psi
#8
Senior Member
RACING JUNKIE
Join Date: May 2006
Posts: 2,044
Here's a good rule of thumb, 10 psi for every 1000rpm so with that being said 15 to 25 at an idle is fine, just make sure it goes up with your rpm, if not then you'll need either a heavier oil or a high pressure spring in the pump. JMO> Charles
#10
Senior Member
RACING JUNKIE
Join Date: Sep 2007
Posts: 4,137
How much oil preasure do you think you need at an idle ? :?
25 lbs is nothing to worry about..that is plenty for hot idle in my opinion. As long as it goes up with the rpm who cares? How much oil clearance you running and what kind of pump? If it is a stock pump that is normal...I think 40 psi @ 2000 rpm is what chevrolet recomends.
I would definitely be concerned IF it used to carry more and then suddenly did not...but if it has always been that way I wouldn't sweat it too much.
25 lbs is nothing to worry about..that is plenty for hot idle in my opinion. As long as it goes up with the rpm who cares? How much oil clearance you running and what kind of pump? If it is a stock pump that is normal...I think 40 psi @ 2000 rpm is what chevrolet recomends.
I would definitely be concerned IF it used to carry more and then suddenly did not...but if it has always been that way I wouldn't sweat it too much.