i am just curious as to what everyone with an aftermarket camshafts'(on stock bottom end) oil presssure is. i have seen many people do big cams and it just destroy stock bottom ends.
my buddy has a 95 z28 with a 236/242 cam and his oil pressure is like 20 at idle and 35 under load

currently, after switching to 20w50 oil, i am around 45 PSI at idle and around 60-65 under load .....oh yeah, that is with 120,000 miles too

 

No change in oil pressure when I installed a cam in my 90k+ engine.

 

Fully warmed up at idle I'm showing about 10psi. Full throttle at redline I'm getting around 50-55 psi. BTW I'm running mobil 1 5w30 currently, I usually run 10w30.

I really don't see any reason to switch to 20w50 oil, as you may be robbing a few hp by pumping something that thick. Not only that, but that much pressure is just not needed.

John

 

eh.. ive got a friend with 130k on stock engine, would it be worthwhile for him to put the 305 or 306 (with new lifters pushrods and rockers) his is a 94 manual z28

also i have oil psi in 30ish range using valvoline synthetic (this is at idle) though it doesn really go up any until about 5k, so it may just be gauge.. is this normal? though sometimes it does go to about 15psi once warmed up

 

20 at idle, then around 10 more pounds per 1000 rpm.

 

With 92K miles and 5W 30 I see about 20-25 at idle..and a pretty constant 40-45 once the rpms are over 1800.

Aaron

 

a few weeks ago i put in xe224/230 spun a brearing an hour later?60,000miles.i guess its hit or miss

 

I spun two rod bearings in a completely stock LT1 down to the stock airbox with 70K miles on the clock. It happens, I guess.

 

No change in oil pressure when I went from stock to a small cam at 60000miles and no change either when I switched to a big cam at 70000miles.

My oil pressure has always been kinda low because I use light oil. (Mobil 1 0W-40) I'm expecting to spin a bearing any day now

 

Spun a bearing at 8000 with a itsy bitsy cam and 5W30 Syn.

 

i have 230,000 miles on my 93 z and at idle it has 20-30 (depending on how old the oil is) and 40-50 at cruise.

i am getting ready to go to 230/236 with some head work and see what happens!

 

with my setup, oil pressure didnt change...I see around 10psi at idle and at WOT it goes up to ~48-53psi

 

35 at hot idle, 45-55 driving at around 2 grand. Sometimes it will see almsot 75 psi when romping on it. This is using 10w40 also.

Putting in a thicker oil to bring up PSI is putting bandages on it. This means your clearances are spacing out, and your getting close to a rebuild. Won't kill the engine to run it like that, but just don't expect it to last forever

-Shannon

 

i have just seen too many people have spun bearings with big cams on high mileage engines. i dont mind the few lost hp. i will prolly go back down to 10w40, i just thought i would see the difference.

 

20 psi idle, 55-60 psi WOT.