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Oil pressure , need help. #480493 09/26/09 08:40 PM 09/26/09 08:40 PM
Joined: May 2009 Posts: 831 Missouri G galen OP super stock
galen OP super stock G Joined: May 2009 Posts: 831 Missouri	Indy single line pickup, 7 quart milodon pan, 8 quarts total with filter. I am running .003 on mains, .0025 on rods. I have a .050 jet in each head feeding harland sharp rockers. 440-1s. Brad Penn 15-40, wix racing filter. I changed the guage to a manual, have 35 lbs at idle steady hot, throttle open I can see it go to 80 then drops to 60 like the pump bypass opens. Is this ok or can I shim the spring in the pump. Melling pump, Indy cover. Galen

Re: Oil pressure , need help. [Re: galen] #480494 09/26/09 09:49 PM 09/26/09 09:49 PM
Joined: Mar 2009 Posts: 1,169 Virginia Beach, VA O Old School super stock
Old School super stock O Joined: Mar 2009 Posts: 1,169 Virginia Beach, VA	sounds normal to me. 68 cuda formula S 588" bb 5sp 70 CUDA CONVERT 500" 5SP (SUBLIME) 70 CUDA CONVERT 500" 5SP (PLUMCRAZY):TOO MUCH HORSEPOWER, IS ALMOST ENOUGH!

Re: Oil pressure , need help. [Re: galen] #480495 09/26/09 10:04 PM 09/26/09 10:04 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Its not what I call normal.... usually it'll go to the open point of the by-pass and hang right there.

Re: Oil pressure , need help. [Re: galen] #480496 09/26/09 10:22 PM 09/26/09 10:22 PM
A Anonymous Unregistered
Anonymous Unregistered A	Quote: Indy single line pickup, 7 quart milodon pan, 8 quarts total with filter. I am running .003 on mains, .0025 on rods. I have a .050 jet in each head feeding harland sharp rockers. 440-1s. Brad Penn 15-40, wix racing filter. I changed the guage to a manual, have 35 lbs at idle steady hot, throttle open I can see it go to 80 then drops to 60 like the pump bypass opens. Is this ok or can I shim the spring in the pump. Melling pump, Indy cover. Galen does it drop back to 60 lbs with no load on the motor at 3500 and higher rpm, or only when under a load?

Re: Oil pressure , need help. #480497 09/26/09 10:33 PM 09/26/09 10:33 PM
Joined: May 2009 Posts: 831 Missouri G galen OP super stock
galen OP super stock G Joined: May 2009 Posts: 831 Missouri	Dan it drops back 3500 or higher, no load.

Re: Oil pressure , need help. [Re: galen] #480498 09/26/09 10:50 PM 09/26/09 10:50 PM
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	What peak RPM are you going to shift the motor at? The 10 lbs per 1000 RPM works really well on most BB Mopars I have seen a 10 HP gain by reducing the oil pressure from 80 lbs at 6500 RPM to 65 lbs at 6500 RPM with 30Wt oil at 170 F I don't run straight 30 WT oil anymore as a results of that dyno session Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Oil pressure , need help. [Re: galen] #480499 09/26/09 10:57 PM 09/26/09 10:57 PM
A Anonymous Unregistered
Anonymous Unregistered A	Quote: Dan it drops back 3500 or higher, no load. is this a recent build? you can try replacing the spring and relief valve, but your symptoms are normally associated with vey loose bearing clearances bleeding off a high volume of oil. you might also test the rocker oiling by stepping down to .035 restrictors. use a drill to prime it and see if you have excessive leakage up there. Cab, i've done dyno testing regarding oil pressure and high/ low volume pumps. the largest differential i ever saw was about 1 horsepower, and that was going all the way down to 45 psi. we documented the tests very carefully matching oil and water temps on each successive pull. give it some thought, a 1/2 HP drill will spin the pump to max pressure and over relief. a 3/4 HP drill will spin it slightly faster, but no difference in pressure or volume is achieved. Last edited by DRAM_Perf_Only; 09/26/09 11:08 PM.

Re: Oil pressure , need help. #480500 09/26/09 11:17 PM 09/26/09 11:17 PM
Joined: May 2009 Posts: 831 Missouri G galen OP super stock
galen OP super stock G Joined: May 2009 Posts: 831 Missouri	Thanks for the input. Its a new build, Going to shift at 6200-6400. Using Clevite full groove MS-1277HG mains 527HND rod bearings.Coated cam bearings, they were on the tight side.I am using comp lifters drilled for pushrod and pin oiling with solid pushrods, could I be loosing to much through the lifters. Should I pull the pan and take a look around.

Re: Oil pressure , need help. [Re: galen] #480501 09/26/09 11:34 PM 09/26/09 11:34 PM
A Anonymous Unregistered
Anonymous Unregistered A	i wouldn't pull the pan until i tested it, as i outlined above. the pushrods should seal off the lifters, especially if they have a 5/16 ball end.

Re: Oil pressure , need help. #480502 09/26/09 11:37 PM 09/26/09 11:37 PM
Joined: May 2009 Posts: 831 Missouri G galen OP super stock
galen OP super stock G Joined: May 2009 Posts: 831 Missouri	I have the valley cover with removable plate. I could remove it turn pump with a drill and see whats going on topside. Engine sounds and responds good. Car is not quite ready to drive yet so I have been running some heat cycles through it. I would just hate to hurt it,

Re: Oil pressure , need help. #480503 09/26/09 11:41 PM 09/26/09 11:41 PM
Joined: May 2009 Posts: 831 Missouri G galen OP super stock
galen OP super stock G Joined: May 2009 Posts: 831 Missouri	Thanks Dan, I did not read your last post first. I will set up a pair of .035 jets and see what that does first. It will be monday morning before I can get back to the shop. I have already missed this season so I have a little time. Galen

Re: Oil pressure , need help. [Re: galen] #480504 09/27/09 12:05 AM 09/27/09 12:05 AM
A Anonymous Unregistered
Anonymous Unregistered A	good luck. i hope it's a simple fix.

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