oil pressure problem - Page 2

Kenney Kelley · 03-05-2012, 12:19 PM

This might not solve your problem but here are two things you might think about. # 1 Do you have the proper gap between the pick-up and the bottom of the pan ? #2 Do you have a couple of coils in your oil pressure line going to your gauge? Kenney Kelley

rx dealer · 03-05-2012, 01:36 PM

What kind of oil pan do you have...some oil pans are really bad and will let the oil go to the front of the pan as soon as you let off and hit the brakes...how many quarts does it hold and how many do you use?...just trying to eliminate things...Luke

79transam · 03-05-2012, 02:45 PM

ok heres what ive found. we took the drain plug out of the oil pan. ran a clear 1/4" hose into a threaded adapter and installed it where drain plug goes, measured normal oil level, then i started it up and kept quick reving it to get the pressure to drop. when the pressure dropped the oil level in the tube droped to. when we measured the difference its only leaving a 1/4" of oil in the pan which is how far the pickup is off the bottom. it also starts pumping air into gauge. ( we put a clear tube on it to) so. Im going to throw a std volume pump on it. and remove the trap doors in my oil pan. if that dosnt work i will remove the plugs out of the lifter valley. at least it appears to be a cheap fix. not bearings.

Rob Petrie E395 · 03-06-2012, 10:31 AM

Quote:

Originally Posted by 79transam

ok heres what ive found. we took the drain plug out of the oil pan. ran a clear 1/4" hose into a threaded adapter and installed it where drain plug goes, measured normal oil level, then i started it up and kept quick reving it to get the pressure to drop. when the pressure dropped the oil level in the tube droped to. when we measured the difference its only leaving a 1/4" of oil in the pan which is how far the pickup is off the bottom. it also starts pumping air into gauge. ( we put a clear tube on it to) so. Im going to throw a std volume pump on it. and remove the trap doors in my oil pan. if that dosnt work i will remove the plugs out of the lifter valley. at least it appears to be a cheap fix. not bearings.

High volume pump? There might be your problem it sounds like its sucking the pan dry faster than the oil can return. I dont know about removing the trap doors though. thier job is to keep the oil in the sump on deceleration to prevent uncovering the pickup just make sure they are working properly ( IE they are not stuck shut). You might just fix one problem and create another if you completely remove them. If it were me I would try one thing at a time untill you figure it out. And it sounds like you are doing this in the car. But if you have it on a stand dont roll the engine upside down and then install the pan. Reason being on some pans it will cause the trap doors to open and stick. Moroso and others recomend the eninge be sitting up right when the pan is installed to prevent this. Good luck and let us know what you find.

79transam · 03-06-2012, 08:23 PM

i already pulled the doors out. i really think that as sticky as the lucas oil is it was holding the doors a little. i went ahead and removed them because its so hard to drop the pan on this car with it in. i still have plugs in the lifter valley if this dosnt cure it i guess i will remove some of them or go to a thinner oil. i really think the std pump will help a lot if not fix completely

Mike Taylor 3601 · 03-08-2012, 11:57 PM

Your original problem sounded like oil getting away from pickup,Your next problem sounds familiar,you did'nt say what pump you put in when you changed,but I ran into problems w/ 3/4 pickup hex drive pumps that melling has,they idle good and drop pressure when rev'd.I sold several and everyone has been took back out& replaced for that reason,replaced with 5/8 pickup HV melling select pump and fixed it.
It acted like cavatation,but could'nt get to stop tried different pickups,clearances on pickup,overfill w/oil, just switched to 5/8 pickup pump and fixed everytime.
Years ago we used run 3/4 pickup bbc pumps in sbc without any problems,so I don't know why we could'nt get those pumps to work,I remember comparing pumps and could see no difference other than pickup diameter.
Mike Taylor 3601

Adger Smith · 03-09-2012, 02:24 AM

Take those nice screens out of the drain backs in the block as well as the vent pipes you screwed in the lifter valley. I bet it has a vac pump on it too. The oil rope that builds up around the rotating assy can keep the oil out of the sump. Get a good windage tray & pan combination on it that scrapes the oil back to the sump.
Those long stroke SBC's need the "right" pan and windage control.
Keep in mind your 434 has a lot more movement above the oil pickup than a 327 or 350.

Reed Granrt · 03-09-2012, 10:41 AM

Quote:

Originally Posted by Adger Smith

Take those nice screens out of the drain backs in the block as well as the vent pipes you screwed in the lifter valley. I bet it has a vac pump on it too. The oil rope that builds up around the rotating assy can keep the oil out of the sump. Get a good windage tray & pan combination on it that scrapes the oil back to the sump.
Those long stroke SBC's need the "right" pan and windage control.
Keep in mind your 434 has a lot more movement above the oil pickup than a 327 or 350.

Yall better listen to Adger
I just got two 434 SBC off my dyno. Both wet sump, one with vacuum pump other without. Customer furnished both oil pan systems. Both blowed a hole in the oil as RPM went up. We dont run any screens as we have seen this problem a number of years ago. Ya got to get the oil off that rotating assembly. Spend time getting oil back too sump. Ya better look at windage, cause it is for real, both above the crank and below the crank.
reed

79transam · 03-09-2012, 07:39 PM

my pan has a scraper on it. its for my setup. i havnt tried a windage tray though

Marine One · 03-10-2012, 10:00 AM

Clarification - A loss of clamp load does not "spin bearings". When you see a spun bearing, you also see it extrude out from the sides. This is not because something was loose, but because everything was tight. In other words, the loose cap and spun bearing is a symptom of a larger problem.

A loss of clamp load will result in a bearing that retains its original width, but flattens out and has "bite / chomp" type witness marks. This is from the cyclic load on the rod journal...open, close, open, close...bite, chomp, bote, chomp....

03-05-2012, 12:19 PM	#11
Kenney Kelley Member Join Date: Dec 2006 Location: Cocoa Florida Posts: 205 Likes: 180 Liked 72 Times in 36 Posts	Re: oil pressure problem This might not solve your problem but here are two things you might think about. # 1 Do you have the proper gap between the pick-up and the bottom of the pan ? #2 Do you have a couple of coils in your oil pressure line going to your gauge? Kenney Kelley

03-05-2012, 01:36 PM	#12
rx dealer Member Join Date: Mar 2007 Location: Lake Orion, Michigan Posts: 337 Likes: 12 Liked 53 Times in 13 Posts	Re: oil pressure problem What kind of oil pan do you have...some oil pans are really bad and will let the oil go to the front of the pan as soon as you let off and hit the brakes...how many quarts does it hold and how many do you use?...just trying to eliminate things...Luke

03-05-2012, 02:45 PM	#13
79transam Junior Member Join Date: Aug 2011 Posts: 22 Likes: 0 Liked 0 Times in 0 Posts	Re: oil pressure problem ok heres what ive found. we took the drain plug out of the oil pan. ran a clear 1/4" hose into a threaded adapter and installed it where drain plug goes, measured normal oil level, then i started it up and kept quick reving it to get the pressure to drop. when the pressure dropped the oil level in the tube droped to. when we measured the difference its only leaving a 1/4" of oil in the pan which is how far the pickup is off the bottom. it also starts pumping air into gauge. ( we put a clear tube on it to) so. Im going to throw a std volume pump on it. and remove the trap doors in my oil pan. if that dosnt work i will remove the plugs out of the lifter valley. at least it appears to be a cheap fix. not bearings.

03-06-2012, 08:23 PM	#15
79transam Junior Member Join Date: Aug 2011 Posts: 22 Likes: 0 Liked 0 Times in 0 Posts	Re: oil pressure problem i already pulled the doors out. i really think that as sticky as the lucas oil is it was holding the doors a little. i went ahead and removed them because its so hard to drop the pan on this car with it in. i still have plugs in the lifter valley if this dosnt cure it i guess i will remove some of them or go to a thinner oil. i really think the std pump will help a lot if not fix completely

03-08-2012, 11:57 PM	#16
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,369 Likes: 349 Liked 293 Times in 101 Posts	Re: oil pressure problem Your original problem sounded like oil getting away from pickup,Your next problem sounds familiar,you did'nt say what pump you put in when you changed,but I ran into problems w/ 3/4 pickup hex drive pumps that melling has,they idle good and drop pressure when rev'd.I sold several and everyone has been took back out& replaced for that reason,replaced with 5/8 pickup HV melling select pump and fixed it. It acted like cavatation,but could'nt get to stop tried different pickups,clearances on pickup,overfill w/oil, just switched to 5/8 pickup pump and fixed everytime. Years ago we used run 3/4 pickup bbc pumps in sbc without any problems,so I don't know why we could'nt get those pumps to work,I remember comparing pumps and could see no difference other than pickup diameter. Mike Taylor 3601

03-09-2012, 02:24 AM	#17
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: oil pressure problem Take those nice screens out of the drain backs in the block as well as the vent pipes you screwed in the lifter valley. I bet it has a vac pump on it too. The oil rope that builds up around the rotating assy can keep the oil out of the sump. Get a good windage tray & pan combination on it that scrapes the oil back to the sump. Those long stroke SBC's need the "right" pan and windage control. Keep in mind your 434 has a lot more movement above the oil pickup than a 327 or 350. __________________ Adger Smith (Former SS)

03-09-2012, 07:39 PM	#19
79transam Junior Member Join Date: Aug 2011 Posts: 22 Likes: 0 Liked 0 Times in 0 Posts	Re: oil pressure problem my pan has a scraper on it. its for my setup. i havnt tried a windage tray though

03-10-2012, 10:00 AM	#20
Marine One Junior Member Join Date: Mar 2010 Location: Indiana Posts: 69 Likes: 2 Liked 0 Times in 0 Posts	Re: oil pressure problem Clarification - A loss of clamp load does not "spin bearings". When you see a spun bearing, you also see it extrude out from the sides. This is not because something was loose, but because everything was tight. In other words, the loose cap and spun bearing is a symptom of a larger problem. A loss of clamp load will result in a bearing that retains its original width, but flattens out and has "bite / chomp" type witness marks. This is from the cyclic load on the rod journal...open, close, open, close...bite, chomp, bote, chomp....