Re: Mopar Street Big Block Oil Pressure
[Re: AndyF]
#2094726
06/20/16 12:32 AM
06/20/16 12:32 AM
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Joined: Aug 2003
Posts: 43,277 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,277
Bend,OR USA
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You could put the HV pump in there to see what it does. That is a fairly simple experiment to run. Sometimes the best solution is a HV pump with a standard spring, other times you need the black spring. Way better to have to much volume and pressure than needed I would install the high volume pump as is but inspect and clean it before use, and then see what pressures you end up with I normally use that pump on all my Hi Po BB builds, I will trim some coils off the black spring if needed, IE a street and strip motor that will see 6500 RPM max I will shoot for 65 lbs at 6500 RPM with hot oil(160F+) on the dyno or in the car On your deal if you decide to reduce the pressure on the high volume pump do as AndyF suggested, remove the black spring and put in the other spring from the standard pump to see what that does for you I have added shims(thin flat washers that will fit in the bypass valve cup between the srping and cup) to a standard pump to icrease the bypass pressure. Let us know what you decide and find out, it will help others on here
Last edited by Cab_Burge; 06/20/16 12:34 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Mopar Street Big Block Oil Pressure
[Re: Beep Beep]
#2094770
06/20/16 01:39 AM
06/20/16 01:39 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Can I run the standard MP oil pump distributor gear with the HV pump? Do I need to pull the distributor and oil pump gear to replace the pump. Or can I just pull the oil pump? (1) I believe so but wait for the BB guys to chime in. (2) I would have the pump bolts barely snug then insert the intergear then final torque the pump bolts for dead on hex alignment. I want to ask what weight of oil are you running? I would want the lightest weight you can get by with & still have adequate psi
live every 24 hour block of time like it's your last day on earth
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Re: Mopar Street Big Block Oil Pressure
[Re: Beep Beep]
#2094803
06/20/16 03:18 AM
06/20/16 03:18 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Alright & I ain't enough of an oil guy to know if that is thin or thick oil (or somewhere in between)
live every 24 hour block of time like it's your last day on earth
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Re: Mopar Street Big Block Oil Pressure
[Re: Beep Beep]
#2094880
06/20/16 11:33 AM
06/20/16 11:33 AM
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Joined: Jan 2003
Posts: 12,237 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,237
Benton, IL.
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I run a stock drive on my HV pumps with no problems at all. And go ahead and try installing the new pump with the drive in place. Spin the pump back and forth as you slide it up into place so that the hex can align. If it fights you, you can always bump the engine over a bit to help align the hex.
Question; Does the HV pump have that much more resistance to turning than the std pump? It would seem that the pressure would impact the resistance more. At say 60# pressure, how much harder do you think it would be to spin an HV pump over a std pump?
Master, again and still
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Re: Mopar Street Big Block Oil Pressure
[Re: lewtot184]
#2094941
06/20/16 01:13 PM
06/20/16 01:13 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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me to for higher RPM/spirited driving I think adequate area on the suction side is important (1/2 pickup & a bit more mods upstream). I want adequate area (pressure side as well)/correct bearing clearances/correct (as light as possible) oil weight/bypasses as some journals can be starving tho the gauge at the beginning of the system (rear of the block) shows an adequate number) THEN see how much pump/spring I need to obtain enough psi
live every 24 hour block of time like it's your last day on earth
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Re: Mopar Street Big Block Oil Pressure
[Re: Beep Beep]
#2095076
06/20/16 04:14 PM
06/20/16 04:14 PM
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Joined: Jan 2003
Posts: 31,061 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,061
Oregon
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Hey RapidRobert, I am running 15w50 15w50 oil? That seems a bit overkill. I'd put some 10w30 in there and see where you're at. The thick oil is hard to pump so the engine doesn't get as much oil flow.
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Re: Mopar Street Big Block Oil Pressure
[Re: AndyF]
#2095086
06/20/16 04:37 PM
06/20/16 04:37 PM
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Joined: Nov 2007
Posts: 21,844 Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,844
Kirkland, Washington
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Hey RapidRobert, I am running 15w50 15w50 oil? That seems a bit overkill. I'd put some 10w30 in there and see where you're at. The thick oil is hard to pump so the engine doesn't get as much oil flow. He'll have less pressure with 10w30. 10w30 and a HV pump might be the perfect combination though.
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Re: Mopar Street Big Block Oil Pressure
[Re: lewtot184]
#2095147
06/20/16 06:31 PM
06/20/16 06:31 PM
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Joined: Feb 2003
Posts: 16,160 Mesa, Arizona
dart4forte
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 16,160
Mesa, Arizona
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Same issue. Stock melling pump with the heavier spring. Running 15/40 Idles at 20pds hot and cruises around 6o-70 hot
“So if it’s on the internet it must be true”
Abe Lincoln
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Re: Mopar Street Big Block Oil Pressure
[Re: Beep Beep]
#2095167
06/20/16 07:12 PM
06/20/16 07:12 PM
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Joined: Jan 2003
Posts: 75,083 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,083
U.S.S.A.
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You'll be fine with the 3/8 pick up.
If you insist on running the thicker oil then I would seriously consider upgrading to the HD oil pump drive ... i would do it no matter what oil ... it's cheaper than the cost of rebuilding the motor if the hex shears off.
running up my post count some more .
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