oil pressure loss during hard braking
 

on my new motor in my iroc, gen I sbc 350ci head cam intake etc.. stock oil pan, new stock pump with high flow spring, stock pick-up. 10w-40 conventional oil. confirmed proper oil level.
mechanical autometer guage
~60psi cold start
~38psi warm idle

during hard braking/panic stops i lose oil pressure, to about 10psi, comes right back up after a second or two.

i know this can be caused by a few things, the oil pickup becoming dislodged or shifted or poor oil return to the crankcase.

i havent done much as far as tearing into things but i wanted to know what other scenarios i could be facing before i drop the pan to see. i want to rule out poor oil return because i get good pressure everywhere else and only experience this during braking, is that logical thinking?

My first thought was the pick up.

Poor windage control

im gonna drain the oil and try to see what the pickup is doing through the drain hole. it just seems really unlikely that a new pump and pick up would work itself loose in under 500mi

why would that now become an issue? it still has a stock bottom end and stock didnt have a windage tray

Did you confirm the pickup to oil pan depth when you built the engine?

I'd guess that it's poor oil control.

i bought this pick up
http://www.summitracing.com/parts/me...t/model/camaro
its what summit, melling and rock auto call for as a replacement

i figured since i didnt change the pan or anything this would the route to go. but to answer your question i did not physically measure

shoulda measured, probably your culprit of it being to high n sucking a bit of air

I am fairly certain that you should have measured your clearance. If the pickup is too high or too low it will cause issues.

Also, what oil pump are you using?

says stock pump with spring upgrade.

Define hard braking. Nailing it at 45+mph?

I see no problem with temporary 10psi at what is likely idle rpm

Just want to make sure that he didn't fall into the M55 trap since he will probably be cracking it open.

yes hard breaking from speeds lets say great than 35mph.

I suspect you just have hit the limitations of a stock pan/pickup setup. Especially if it is only going to 10psi. 10 is no problem for a SBC at idle, which is what you are at if you are nailing the brakes. My Z will do that same thing under hard braking and I know the pickup is just fine. Forget it, you should not be facing such a scenario often.

further reading on other forums agree with you. its just something i am unfamiliar with and considered an "issue". still gonna pull the pan and check pickup height and make sure nothing is out of whack. if all checks out, it is what it is i guess and ill have to get used to it.

should not be hard to get used to. You really should't be hitting that scenario too often.

or if you feel you will do this regularly maybe invest in a nice canton oil pan.