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Re: Big block oil pump
[Re: Beep Beep]
#1853100
06/20/15 11:03 AM
06/20/15 11:03 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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your cruise psi is higher than needed but not a dealbreaker by any means. #1 pick the thinnest weight of oil you can get by with for your app. use the lowest level of pump/spring combo to maintain 8 psi per 1K of RPM. levels are std pump/std spring std pump stiff spring hi vol pump std spring hi vol pump stiff spring. use just what you need as more stresses/wears the cam gear/inter gear/intergear bushing, again not a dealbreaker. Your idle psi can be lower than what you have & if it jumps up immed when you punch it you are fine. I'd be more wanting to do extensive oiling mods first then pick the wt then pick the pump/spring. bottom line as you know is can your pump/spring maintain enough psi & the rods are the end of the line/critical area, #1 #1 are they getting fed properly.
live every 24 hour block of time like it's your last day on earth
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Re: Big block oil pump
[Re: Beep Beep]
#1853828
06/21/15 03:32 PM
06/21/15 03:32 PM
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Joined: Oct 2003
Posts: 4,013
South Park, Pa.
68LAR
master
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master
Joined: Oct 2003
Posts: 4,013
South Park, Pa.
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What is working for me is a HV pump with 15w/40 Rotilla T. I did the oiling mods to the block except for the 3/8" oil pick. I'm not a professional racer, by no means, every hundredths of a second mean nothing to me. You might call me a "weekend warrior", at best, at times. When cold my idle pressure is close to 90 psi. At temp. (160*), my idle,(1200 rpm) pressure is 55 psi. At 2000 rpm it holds steady at 65 psi. The most I try to rev the engine to is 6500 rpm. Just sharing my experience. Have fun....
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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Re: Big block oil pump
[Re: lewtot184]
#1853915
06/21/15 06:33 PM
06/21/15 06:33 PM
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Joined: Jan 2003
Posts: 25,910
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,910
Rio Linda, CA
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High-volume pumps come with the high-pressure spring.
The INTERNET, the MISinformation superhighway
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Re: Big block oil pump
[Re: lewtot184]
#1853997
06/21/15 10:18 PM
06/21/15 10:18 PM
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Joined: Apr 2015
Posts: 114
Oregon
Wagonman1967
member
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member
Joined: Apr 2015
Posts: 114
Oregon
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the high volume pumps heavy high pressure spring is taken out and thrown in the junk box in my garage. excessive pressures eat up the intermediate shaft and bushing. the only use for those heavy springs is for bottom end bleeders that can't make pressure any other way. HMMM Makes sense.
1968 Bronze Metalic Road Runner
!967 Malibu Wagon Original 4sd w/air
2001 Dodge Ram 4wd
1985 GMC K1500 4in lift
1993 Honda Civic W 350k Beater
2003 Honda VTX 1800 Bagger
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Re: Big block oil pump
[Re: Beep Beep]
#1854054
06/21/15 11:51 PM
06/21/15 11:51 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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So if I use the high volume pump, and remove the heavy spring which spring do I replace it with?
Do the high volume pumps put extra wear on bearings and the distributor gears?
Does the pressure also increase with the high volume pumps, or is the pressure only affected by the bearing clearances?
(1) one from a stock pump (2) bearings no dist gears yes (3) A I believe it will. B As said psi is a measure of restriction which includes bearings and everything else downstream
live every 24 hour block of time like it's your last day on earth
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Re: Big block oil pump
[Re: Beep Beep]
#1854083
06/22/15 12:23 AM
06/22/15 12:23 AM
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Joined: Aug 2003
Posts: 43,259
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,259
Bend,OR USA
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Both of the high volume oil pump brands sold in the U.S. usually have the bypass spring pressure set at 80 lbs, some may be as high as 90 and some may be as low as 70 lbs cold, depending on the oil viscoty and outside air temps. I would never throw a new Hi Po part in the trash,  I would and do trim them (the bypass springs  )or grind(slowly a little bit at a time to avoid overheating from grinding) them down to reduce the overall lengths to get the pressures I want  The longer rotors do suck in more oil and provide more volume of oil into the motor, the oil pump can only pump as much oil as the motor will take before the bypass spring and valve opens, kicks in, and starts bypassing oil back into the pump. I do set my rod and main bearings up with a lot of clearance(.0032+ on both) so I get a lot of oil flowing through the motor while running, you need to remember that the cam is oiled from the bottom by splash oiling slung from the crankshaft assembly so it is hard to over oil it   IHTHs As far as bronze distribotor oil pump drive gears there are soft ones out there and there are good ones, the good ones last a lot longer than the soft ones do  I've seen both used in other builders motors and seen the soft ones fail on the dyno breaking in and testing the motor
Last edited by Cab_Burge; 06/22/15 12:25 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Big block oil pump
[Re: Beep Beep]
#1854472
06/22/15 05:26 PM
06/22/15 05:26 PM
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Joined: Jan 2003
Posts: 25,910
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,910
Rio Linda, CA
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So if I use the high volume pump, and remove the heavy spring which spring do I replace it with?
Generally speaking, the high pressure spring is painted black or natural color, the standard pressure spring is painted red.
The INTERNET, the MISinformation superhighway
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Re: Big block oil pump
[Re: Cab_Burge]
#1854526
06/22/15 06:33 PM
06/22/15 06:33 PM
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Joined: Jun 2008
Posts: 3,916
usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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Both of the high volume oil pump brands sold in the U.S. usually have the bypass spring pressure set at 80 lbs, some may be as high as 90 and some may be as low as 70 lbs cold, depending on the oil viscoty and outside air temps. I would never throw a new Hi Po part in the trash, I would and do trim them (the bypass springs )or grind(slowly a little bit at a time to avoid overheating from grinding) them down to reduce the overall lengths to get the pressures I want The longer rotors do suck in more oil and provide more volume of oil into the motor, the oil pump can only pump as much oil as the motor will take before the bypass spring and valve opens, kicks in, and starts bypassing oil back into the pump. I do set my rod and main bearings up with a lot of clearance(.0032+ on both) so I get a lot of oil flowing through the motor while running, you need to remember that the cam is oiled from the bottom by splash oiling slung from the crankshaft assembly so it is hard to over oil it IHTHs As far as bronze distribotor oil pump drive gears there are soft ones out there and there are good ones, the good ones last a lot longer than the soft ones do I've seen both used in other builders motors and seen the soft ones fail on the dyno breaking in and testing the motor anybody who knows anything about spring rates knows that trimming springs doesn't reduce the spring rate.
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Re: Big block oil pump
[Re: John_Kunkel]
#1854528
06/22/15 06:37 PM
06/22/15 06:37 PM
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Joined: Jun 2008
Posts: 3,916
usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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So if I use the high volume pump, and remove the heavy spring which spring do I replace it with?
Generally speaking, the high pressure spring is painted black or natural color, the standard pressure spring is painted red. all the originals were red. i've seen and have pink and natural colored "stock" springs from aftermarket stock pumps. this is why i measure the length and wire diameters to try and get an "apples to apples" comparison. never know what your buying anymore.
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Re: Big block oil pump
[Re: lewtot184]
#1854644
06/22/15 08:00 PM
06/22/15 08:00 PM
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Joined: Aug 2003
Posts: 43,259
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,259
Bend,OR USA
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Both of the high volume oil pump brands sold in the U.S. usually have the bypass spring pressure set at 80 lbs, some may be as high as 90 and some may be as low as 70 lbs cold, depending on the oil viscoty and outside air temps. I would never throw a new Hi Po part in the trash, I would and do trim them (the bypass springs )or grind(slowly a little bit at a time to avoid overheating from grinding) them down to reduce the overall lengths to get the pressures I want The longer rotors do suck in more oil and provide more volume of oil into the motor, the oil pump can only pump as much oil as the motor will take before the bypass spring and valve opens, kicks in, and starts bypassing oil back into the pump. I do set my rod and main bearings up with a lot of clearance(.0032+ on both) so I get a lot of oil flowing through the motor while running, you need to remember that the cam is oiled from the bottom by splash oiling slung from the crankshaft assembly so it is hard to over oil it IHTHs As far as bronze distribotor oil pump drive gears there are soft ones out there and there are good ones, the good ones last a lot longer than the soft ones do I've seen both used in other builders motors and seen the soft ones fail on the dyno breaking in and testing the motor anybody who knows anything about spring rates knows that trimming springs doesn't reduce the spring rate. Let's see, if we reduce the overall length of the spring, especially when it is already compress some,loaded under compression, and the oil pressure drops when hot after shortening the spring, I assumed that reduced the oil pressure, which was exactly what I wanted to accomplish My training on springs, if my memory is serving me half way accurately now,is shortening the spring increases the unloaded spring rating, is that correct or not 
Last edited by Cab_Burge; 06/22/15 08:01 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Big block oil pump
[Re: Cab_Burge]
#1854728
06/22/15 09:34 PM
06/22/15 09:34 PM
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Joined: Jan 2003
Posts: 12,226
Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,226
Benton, IL.
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I have always had good luck either trimming the springs a little to lower the pressure or shimming them to gain some pressure. I understand that doing either one does not change the spring's rate, but I can tell that doing one or the other almost always changes my oil pressure. Just my 
Master, again and still
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You can trim the bypass spring to set the oil presure you want with hot oil, I like 10 lbs per 1000 RPM at WOT, IE 65 lbs at 6500 RPM