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Too much oil pressure #1743581 02/01/15 12:03 AM 02/01/15 12:03 AM
Joined: Aug 2009 Posts: 2,039 Mooresburg, Tn ' '72CudaRacer OP top fuel
'72CudaRacer OP top fuel ' Joined: Aug 2009 Posts: 2,039 Mooresburg, Tn	I built a 500" RB for a customer, (stock block) and used the oil pump that was on the old engine. It's a Melling HV oil pump with a Milodon cover, single external line from a Milodon static pick up. When I primed the engine new, it had over 100 lbs of oil pressure. I replaced the oil pump regulator and spring with a new one from a Milodon overhaul kit. That brought the oil pressure down to about 85-88 lbs with a drill and priming shaft. I'd like it around 70-75 lbs idling. Whats the best way to bring this down? Thanks, Brian

Re: Too much oil pressure [Re: '72CudaRacer] #1743582 02/01/15 12:25 AM 02/01/15 12:25 AM
Joined: Jan 2011 Posts: 4,785 Utah and Alaska astjp2 master
astjp2 master Joined: Jan 2011 Posts: 4,785 Utah and Alaska	non-HV pump 1941 Taylorcraft 1968 Charger 1994 Wrangler 1998 Wrangler 2008 Kia Rio 2017 Jetta I didn't do 4 years and 9 months of Graduate School to be called Mister!

Re: Too much oil pressure [Re: astjp2] #1743583 02/01/15 01:27 AM 02/01/15 01:27 AM
Joined: Dec 2003 Posts: 1,400 Wi. old_racer pro stock
old_racer pro stock Joined: Dec 2003 Posts: 1,400 Wi.	how about a spring from a stock pump? why would you want 70-75 lbs idling?

Re: Too much oil pressure [Re: old_racer] #1743584 02/01/15 02:40 AM 02/01/15 02:40 AM
Joined: Jun 2005 Posts: 384 Montana 6 67DodgeCharger On vacation
67DodgeCharger On vacation 6 Joined: Jun 2005 Posts: 384 Montana	Hot Rod has an article that covers the issue of too much oil pressure, except it being a chevy engine. The owner was breaking distributor gears from too much pressure from the oil pump and a very aggressive cam. The mechanic changed out the cam, lifters and I think the rockers, I have an old brain that works really good for an hour or less. The owner had a miss match of parts to compensate for problems of parts breaking, I would look at your setup and see if you are going to cause some problems with too much oil pressure.

Re: Too much oil pressure [Re: '72CudaRacer] #1743585 02/01/15 04:26 AM 02/01/15 04:26 AM
Joined: Aug 2003 Posts: 43,127 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,127 Bend,OR USA	Quote: I built a 500" RB for a customer, (stock block) and used the oil pump that was on the old engine. It's a Melling HV oil pump with a Milodon cover, single external line from a Milodon static pick up. When I primed the engine new, it had over 100 lbs of oil pressure. I replaced the oil pump regulator and spring with a new one from a Milodon overhaul kit. That brought the oil pressure down to about 85-88 lbs with a drill and priming shaft. I'd like it around 70-75 lbs idling. Whats the best way to bring this down? Thanks, Brian I have cut and ground one to two coils off the high pressure springs in those pumps(mellings high volume) to get 60 to 70 lbs at or above 6500 RPM with hot thin (5W20WT) oil Cut twice to avoid cutting to much the first time Most BB Mopars will idle at or below 30 lbs less than when above 6000 RPM with hot oil I like and use the old school rule of using 10 lbs. per thousand RPM with hot oil Most of those high volume and high pressure pumps use the same bypass springs so they will usually bypass at or close to 80 lbs cold. Let us know what you end up doing and the resultant pressure Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Too much oil pressure [Re: '72CudaRacer] #1743586 02/01/15 10:31 AM 02/01/15 10:31 AM
Joined: Feb 2005 Posts: 4,311 Prospect, PA BSB67 master
BSB67 master Joined: Feb 2005 Posts: 4,311 Prospect, PA	Quote: I built a 500" RB for a customer, (stock block) and used the oil pump that was on the old engine. It's a Melling HV oil pump with a Milodon cover, single external line from a Milodon static pick up. When I primed the engine new, it had over 100 lbs of oil pressure. I replaced the oil pump regulator and spring with a new one from a Milodon overhaul kit. That brought the oil pressure down to about 85-88 lbs with a drill and priming shaft. I'd like it around 70-75 lbs idling. Whats the best way to bring this down? Thanks, Brian Is it idling at 85 psi now, or priming at 85 now?

Re: Too much oil pressure [Re: BSB67] #1743587 02/01/15 10:58 AM 02/01/15 10:58 AM
Joined: Mar 2006 Posts: 9,826 MI, usa dvw master
dvw master Joined: Mar 2006 Posts: 9,826 MI, usa	What oil? What temp? Mine has over 100 psi cold with 5w30. Warm 25@1300, 65@7000. The drill won't tell you much. Doug

Re: Too much oil pressure [Re: dvw] #1743588 02/01/15 01:16 PM 02/01/15 01:16 PM
Joined: Feb 2008 Posts: 714 Central TEXAS!!!! sr4440 super stock
sr4440 super stock Joined: Feb 2008 Posts: 714 Central TEXAS!!!!	On the dyno the priming pressure is always higher then what the running pressure is. Before i would "fix" it, I would start the engine and see where your at. Joe Without Data, you’re just another guy with an opinion.

Re: Too much oil pressure [Re: '72CudaRacer] #1743589 02/01/15 02:09 PM 02/01/15 02:09 PM
Joined: May 2003 Posts: 6,561 Downtown Roebuck Ont Twostick Still wishing...
Twostick Still wishing... Joined: May 2003 Posts: 6,561 Downtown Roebuck Ont	Quote: I built a 500" RB for a customer, (stock block) and used the oil pump that was on the old engine. It's a Melling HV oil pump with a Milodon cover, single external line from a Milodon static pick up. When I primed the engine new, it had over 100 lbs of oil pressure. I replaced the oil pump regulator and spring with a new one from a Milodon overhaul kit. That brought the oil pressure down to about 85-88 lbs with a drill and priming shaft. I'd like it around 70-75 lbs idling. Whats the best way to bring this down? Thanks, Brian That pressure will be considerably less once the oil is up to operating temp. Let it warm up and see where you're at. 75 PSI seems like a lot of pressure to me but if that is where you want it at hot idle, depending on how fast it idles, you may be putting the other spring back in. Kevin

Re: Too much oil pressure [Re: '72CudaRacer] #1743590 02/01/15 02:09 PM 02/01/15 02:09 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	This is what I use. Be forewarned back it off a bit when installing it mine went to 150LB on a milidon pump now maxes at 65 to 70 cold hot. You want volume a small pump can't supply if it needs it hot under power so HV pump with right spring is just the ticket. On a HV pump in the old days I used to have 110 going out the end for 25 years don't hurt anything but using more power than needed. http://www.manciniracing.com/milbrbadregk.html http://www.summitracing.com/int/parts/mil-21550

Re: Too much oil pressure [Re: Dodgem] #1743591 02/01/15 07:53 PM 02/01/15 07:53 PM
Joined: Jan 2012 Posts: 2,635 Stuttgart, Arkansas rickseeman master
rickseeman master Joined: Jan 2012 Posts: 2,635 Stuttgart, Arkansas	I agree or 440 Source sells theirs for $24.95. http://store.440source.com/Adjustable-Oil-Pressure-Regulator/productinfo/200-1093/ 2011 Drag Pak Challenger

Re: Too much oil pressure [Re: rickseeman] #1743592 02/03/15 01:53 AM 02/03/15 01:53 AM
Joined: Feb 2003 Posts: 16,133 Mesa, Arizona D dart4forte I Live Here
dart4forte I Live Here D Joined: Feb 2003 Posts: 16,133 Mesa, Arizona	Too much oil pressure equals bad things Filter could blow off or burst at the seams Wash the bearings Overcome the rear main seal Is this a street motor?

Re: Too much oil pressure [Re: '72CudaRacer] #1743593 02/03/15 11:35 AM 02/03/15 11:35 AM
Joined: Jan 2003 Posts: 9,986 Frostbitefalls MN (Rocky&Bullw... gregsdart master
gregsdart master Joined: Jan 2003 Posts: 9,986 Frostbitefalls MN (Rocky&Bullw...	Stick with the original spring the pump came with, but like Cab said, shorten it a little at a time. It doesn't take much and is very easy to do. If you over shoot the mark, very thin shims behind the spring will bring it back up. I don't like the stock spring idea because someone else can come along and shim it, not knowing it is easy to put the spring into coil bind if you go too far. Then disaster strikes when the pressure goes off the chart. 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

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