High oil pressure?

TinSoldier 3215 · 06-23-2011, 09:07 PM

Found out that the oil pressure with 20/50 wt when rev engine goes to more then 90 pounds also heavy spring in oil pump?

Is oil to heavy? Thanks

TinSoldier 3215 · 06-23-2011, 09:30 PM

Thanks James!!!

John Dinkel · 06-23-2011, 09:35 PM

Why are you using that heavy oil? Try 10W-30. You don't have a top fuler do you? Use synthetic racing oil.

Alan Roehrich · 06-23-2011, 09:36 PM

Way too much oil unless that's a Cleveland. Even 5W 30 synthetic is plenty.

TinSoldier 3215 · 06-24-2011, 05:48 AM

No Top Fuler, Would not have one of those oil down track junk!!!! Its a bracket car 400 small block 10.20 at 131.89 at wt 3160. Thanks Guys, You all are the Best!!! What wt of oil do you all like?

Mike Taylor 3601 · 06-24-2011, 02:25 PM

I'm guessing you have HV pump with about .0015-.002 bearing clearanceGo to 10-30 or 20 may lower when warm. 90 lbs won't hurt anything besides taking a little power or worst case wear dist. gear. If oil does'nt drop psi enough to suit you change spring or pump.
I've been using 10W30 and 20wt for a long time.
Mike Taylor 3601

TinSoldier 3215 · 06-25-2011, 10:01 AM

I'm going out to the shop and put in the 5/20 wt and see if that does the FIX.

Charles Rainey · 06-25-2011, 12:29 PM

I would like to add my $.02 worth and I dont want to step on any toes. Oil pressure within a engine is determined by resistance that is "seen" within the engine,etc tight or loose clearance, small holes versus large holes, programmed bleed off built within the engine. The relief spring only sets the pressure that it opens to bypass the pump. Theoretically you would want your bypass to open ever so slightly in operation so that it is not cycling too often. Yes you are correct on oil viscosity being a determining factor also. Thicker oil will have more resistance, therefore more oil pressure. There has always been a misconception that a high volume oil pump is a no no. But that is not necessarily true as resistance to flow(clearances will determine how much oil will go thru the engine). I have heard many people say that it will empty a oil pan. The only way that can happen is you already have too much clearance and the pump is trying to meet the demand. Many smart engine builders use HV pumps so as to have enough volume later in life of the engine as clearances begin to get larger from wear. Of course race engines are normally built with a pump that just meets its demand as the engine will never "wear out". Synthetics has change many facets of oiling as we can do things now that we could not do even 10 years ago. We can now run closer to the edge than we ever could with mineral base oils.
Hope I did not step on any toes. Sorry for the long dissertation
Charlie

TinSoldier 3215 · 06-25-2011, 04:21 PM

I put in 5/20 wt oil and let engine warm up to 150 and pressure was 60 and over 6000 stop at 75. Thanks Guys for all the HELP!!!!

Mike Taylor 3601 · 06-27-2011, 10:26 AM

The high vol. pump pan dry myth,I found where that came from @ PRI show one time Melling had a bunch of bulletins,one addressed that it came from old Y block fords292,312 they did'nt have good drainback and not much restriction to top so it was possible to pump pan dry ,but stated most modern engines that was'nt possible.
Mike Taylor 3601

06-23-2011, 09:07 PM	#1
TinSoldier 3215 Member Join Date: Jul 2009 Location: Bulington, Ky Posts: 359 Likes: 0 Liked 6 Times in 5 Posts	High oil pressure? Found out that the oil pressure with 20/50 wt when rev engine goes to more then 90 pounds also heavy spring in oil pump? Is oil to heavy? Thanks

06-23-2011, 09:30 PM	#2
TinSoldier 3215 Member Join Date: Jul 2009 Location: Bulington, Ky Posts: 359 Likes: 0 Liked 6 Times in 5 Posts	Re: High oil pressure? Thanks James!!!

06-23-2011, 09:35 PM	#3
John Dinkel Senior Member Join Date: Nov 2005 Location: Pinckney, Michigan Posts: 507 Likes: 399 Liked 263 Times in 68 Posts	Re: High oil pressure? Why are you using that heavy oil? Try 10W-30. You don't have a top fuler do you? Use synthetic racing oil. __________________ John Dinkel 3295 STK

06-23-2011, 09:36 PM	#4
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,112 Likes: 1,570 Liked 1,818 Times in 413 Posts	Re: High oil pressure? Way too much oil unless that's a Cleveland. Even 5W 30 synthetic is plenty. __________________ Alan Roehrich 212A G/S

06-24-2011, 05:48 AM	#5
TinSoldier 3215 Member Join Date: Jul 2009 Location: Bulington, Ky Posts: 359 Likes: 0 Liked 6 Times in 5 Posts	Re: High oil pressure? No Top Fuler, Would not have one of those oil down track junk!!!! Its a bracket car 400 small block 10.20 at 131.89 at wt 3160. Thanks Guys, You all are the Best!!! What wt of oil do you all like?

06-24-2011, 02:25 PM	#6
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,371 Likes: 352 Liked 305 Times in 102 Posts	Re: High oil pressure? I'm guessing you have HV pump with about .0015-.002 bearing clearanceGo to 10-30 or 20 may lower when warm. 90 lbs won't hurt anything besides taking a little power or worst case wear dist. gear. If oil does'nt drop psi enough to suit you change spring or pump. I've been using 10W30 and 20wt for a long time. Mike Taylor 3601

06-25-2011, 10:01 AM	#7
TinSoldier 3215 Member Join Date: Jul 2009 Location: Bulington, Ky Posts: 359 Likes: 0 Liked 6 Times in 5 Posts	Re: High oil pressure? I'm going out to the shop and put in the 5/20 wt and see if that does the FIX.

06-25-2011, 12:29 PM	#8
Charles Rainey Junior Member Join Date: May 2011 Posts: 40 Likes: 0 Liked 0 Times in 0 Posts	Re: High oil pressure? I would like to add my $.02 worth and I dont want to step on any toes. Oil pressure within a engine is determined by resistance that is "seen" within the engine,etc tight or loose clearance, small holes versus large holes, programmed bleed off built within the engine. The relief spring only sets the pressure that it opens to bypass the pump. Theoretically you would want your bypass to open ever so slightly in operation so that it is not cycling too often. Yes you are correct on oil viscosity being a determining factor also. Thicker oil will have more resistance, therefore more oil pressure. There has always been a misconception that a high volume oil pump is a no no. But that is not necessarily true as resistance to flow(clearances will determine how much oil will go thru the engine). I have heard many people say that it will empty a oil pan. The only way that can happen is you already have too much clearance and the pump is trying to meet the demand. Many smart engine builders use HV pumps so as to have enough volume later in life of the engine as clearances begin to get larger from wear. Of course race engines are normally built with a pump that just meets its demand as the engine will never "wear out". Synthetics has change many facets of oiling as we can do things now that we could not do even 10 years ago. We can now run closer to the edge than we ever could with mineral base oils. Hope I did not step on any toes. Sorry for the long dissertation Charlie

06-25-2011, 04:21 PM	#9
TinSoldier 3215 Member Join Date: Jul 2009 Location: Bulington, Ky Posts: 359 Likes: 0 Liked 6 Times in 5 Posts	Re: High oil pressure? I put in 5/20 wt oil and let engine warm up to 150 and pressure was 60 and over 6000 stop at 75. Thanks Guys for all the HELP!!!!

06-27-2011, 10:26 AM	#10
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,371 Likes: 352 Liked 305 Times in 102 Posts	Re: High oil pressure? The high vol. pump pan dry myth,I found where that came from @ PRI show one time Melling had a bunch of bulletins,one addressed that it came from old Y block fords292,312 they did'nt have good drainback and not much restriction to top so it was possible to pump pan dry ,but stated most modern engines that was'nt possible. Mike Taylor 3601