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12-19-2014, 09:42 AM
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#1
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Join Date: Dec 2009
Location: milltown
Posts: 1,497
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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?
__________________
2002 Camaro Sunset Orange Mettalic, V6, 5spd, bilstein HD shocks and struts, eibach pro lowering kit, eibach f/r sway bars, lakewood PHB, UMI 2 point subframe connectors, energy suspensions poly master bushing kit
daily econobox and first car
1986 IROC-Z, T56, MGW shifter, Heads, Cam, Holley Stealth Ram 350, t-top, tubular LCA with relo brackets, adjustable PHB, belltech sway bars, ground control weight jacks, SLP mid length headers, 3in w/borla XR1, RIP 3 10 bolts, 12.7 @ 109 so far.. atleast its faster than stock SOLD
1971 Camaro LS3/T56/9in, cam only and still carbed, RIP 2 10 bolts, 11.62@121
03 Blazer 2 door - salt sponge
Last edited by redsoxsstink; 12-19-2014 at 09:42 AM.
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12-19-2014, 10:57 AM
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#2
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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My first thought was the pick up.
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12-19-2014, 10:59 AM
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#3
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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Poor windage control
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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12-19-2014, 10:59 AM
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#4
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Join Date: Dec 2009
Location: milltown
Posts: 1,497
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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
__________________
2002 Camaro Sunset Orange Mettalic, V6, 5spd, bilstein HD shocks and struts, eibach pro lowering kit, eibach f/r sway bars, lakewood PHB, UMI 2 point subframe connectors, energy suspensions poly master bushing kit
daily econobox and first car
1986 IROC-Z, T56, MGW shifter, Heads, Cam, Holley Stealth Ram 350, t-top, tubular LCA with relo brackets, adjustable PHB, belltech sway bars, ground control weight jacks, SLP mid length headers, 3in w/borla XR1, RIP 3 10 bolts, 12.7 @ 109 so far.. atleast its faster than stock SOLD
1971 Camaro LS3/T56/9in, cam only and still carbed, RIP 2 10 bolts, 11.62@121
03 Blazer 2 door - salt sponge
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12-19-2014, 11:13 AM
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#5
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Join Date: Dec 2009
Location: milltown
Posts: 1,497
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Quote:
Originally Posted by LTb1ow
Poor windage control
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why would that now become an issue? it still has a stock bottom end and stock didnt have a windage tray
__________________
2002 Camaro Sunset Orange Mettalic, V6, 5spd, bilstein HD shocks and struts, eibach pro lowering kit, eibach f/r sway bars, lakewood PHB, UMI 2 point subframe connectors, energy suspensions poly master bushing kit
daily econobox and first car
1986 IROC-Z, T56, MGW shifter, Heads, Cam, Holley Stealth Ram 350, t-top, tubular LCA with relo brackets, adjustable PHB, belltech sway bars, ground control weight jacks, SLP mid length headers, 3in w/borla XR1, RIP 3 10 bolts, 12.7 @ 109 so far.. atleast its faster than stock SOLD
1971 Camaro LS3/T56/9in, cam only and still carbed, RIP 2 10 bolts, 11.62@121
03 Blazer 2 door - salt sponge
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12-19-2014, 07:38 PM
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#6
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Did you confirm the pickup to oil pan depth when you built the engine?
I'd guess that it's poor oil control.
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12-20-2014, 12:03 AM
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#7
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Join Date: Dec 2009
Location: milltown
Posts: 1,497
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Quote:
Originally Posted by WildBillyT
Did you confirm the pickup to oil pan depth when you built the engine?
I'd guess that it's poor oil control.
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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
__________________
2002 Camaro Sunset Orange Mettalic, V6, 5spd, bilstein HD shocks and struts, eibach pro lowering kit, eibach f/r sway bars, lakewood PHB, UMI 2 point subframe connectors, energy suspensions poly master bushing kit
daily econobox and first car
1986 IROC-Z, T56, MGW shifter, Heads, Cam, Holley Stealth Ram 350, t-top, tubular LCA with relo brackets, adjustable PHB, belltech sway bars, ground control weight jacks, SLP mid length headers, 3in w/borla XR1, RIP 3 10 bolts, 12.7 @ 109 so far.. atleast its faster than stock SOLD
1971 Camaro LS3/T56/9in, cam only and still carbed, RIP 2 10 bolts, 11.62@121
03 Blazer 2 door - salt sponge
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12-20-2014, 02:07 AM
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#8
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Join Date: Nov 2012
Location: Millstone, NJ
Posts: 641
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shoulda measured, probably your culprit of it being to high n sucking a bit of air
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94 TA GT. Stock 350, cam, exhaust
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12-20-2014, 02:13 AM
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#9
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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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?
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12-20-2014, 09:02 AM
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#10
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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Quote:
Originally Posted by WildBillyT
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?
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says stock pump with spring upgrade.
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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12-20-2014, 10:01 AM
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#11
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,152
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Define hard braking. Nailing it at 45+mph?
I see no problem with temporary 10psi at what is likely idle rpm
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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12-20-2014, 07:22 PM
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#12
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Quote:
Originally Posted by LTb1ow
says stock pump with spring upgrade.
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Just want to make sure that he didn't fall into the M55 trap since he will probably be cracking it open.
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12-22-2014, 07:42 AM
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#13
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Join Date: Dec 2009
Location: milltown
Posts: 1,497
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Quote:
Originally Posted by BonzoHansen
Define hard braking. Nailing it at 45+mph?
I see no problem with temporary 10psi at what is likely idle rpm
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yes hard breaking from speeds lets say great than 35mph.
__________________
2002 Camaro Sunset Orange Mettalic, V6, 5spd, bilstein HD shocks and struts, eibach pro lowering kit, eibach f/r sway bars, lakewood PHB, UMI 2 point subframe connectors, energy suspensions poly master bushing kit
daily econobox and first car
1986 IROC-Z, T56, MGW shifter, Heads, Cam, Holley Stealth Ram 350, t-top, tubular LCA with relo brackets, adjustable PHB, belltech sway bars, ground control weight jacks, SLP mid length headers, 3in w/borla XR1, RIP 3 10 bolts, 12.7 @ 109 so far.. atleast its faster than stock SOLD
1971 Camaro LS3/T56/9in, cam only and still carbed, RIP 2 10 bolts, 11.62@121
03 Blazer 2 door - salt sponge
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12-22-2014, 08:45 AM
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#14
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,152
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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.
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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12-22-2014, 10:00 AM
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#15
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Join Date: Dec 2009
Location: milltown
Posts: 1,497
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Quote:
Originally Posted by BonzoHansen
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.
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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.
__________________
2002 Camaro Sunset Orange Mettalic, V6, 5spd, bilstein HD shocks and struts, eibach pro lowering kit, eibach f/r sway bars, lakewood PHB, UMI 2 point subframe connectors, energy suspensions poly master bushing kit
daily econobox and first car
1986 IROC-Z, T56, MGW shifter, Heads, Cam, Holley Stealth Ram 350, t-top, tubular LCA with relo brackets, adjustable PHB, belltech sway bars, ground control weight jacks, SLP mid length headers, 3in w/borla XR1, RIP 3 10 bolts, 12.7 @ 109 so far.. atleast its faster than stock SOLD
1971 Camaro LS3/T56/9in, cam only and still carbed, RIP 2 10 bolts, 11.62@121
03 Blazer 2 door - salt sponge
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12-22-2014, 10:44 AM
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#16
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,152
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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.
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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