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#1
08-29-2017, 09:26 AM
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Oil pump shim size for 70 psi
What shim thickness behind the pressure relief spring in a 60 psi pump is required to get 70 psi?
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1967 Firechicken, 499", Edl heads, 262/[email protected]" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. [email protected] mph with a 1.45 60'. Still WAY under the rollbar rule. |
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#2
08-29-2017, 09:49 AM
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Measure your compressed lenght of spring now and divide that by your current oil pressure of 60 to 65 lb.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#3
08-29-2017, 10:46 AM
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Make a block off plate to bolt where the pump mounts to the block. Drill and tap a hole in the middle of it for a screw in mechanical guage.
Bucket of oil and drill...then you can set the spring tension exactly where you want it. Clay
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All the federales say,they could've had him any day They only let him slip away, out of kindness...I suppose Poncho & Lefty |
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#4
08-29-2017, 11:02 AM
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Quote:
Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#5
08-29-2017, 11:19 AM
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Oil up the spring port, pack clay into it , screw the cap plug on and then remove the clay and measure it.
Also set a washer in first that fits close and subtract your washer thickness from your clay measurements.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#6
08-29-2017, 11:29 AM
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I tried measuring oil pump springs on a valve spring tester. They are so light it was hard to tell any difference.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune [email protected] 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs 1964 Corvette Coupe 327 4 speed |
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#7
08-29-2017, 12:00 PM
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I've done that same thing Skip , that's why I took to lenght measurements.
I did a chart on the 80 lb pump years ago but can't track it down lately.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#8
08-29-2017, 12:02 PM
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Quote:
Tom V. ps Skip I can put the cover on the spring and compress and screw the cover on the pump with one hand. Yes a very light spring. And difficult to measure with accuracy on any spring tester unless a very light psi tester.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#9
08-29-2017, 01:07 PM
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Quote:
Correct for how the spring sits on the ball, bore length, then depth (spring rest) in cap nut. Just seems like it would be easy. Clay |
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#10
08-29-2017, 01:25 PM
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Why 70lbs. ? Why not 80lbs. or 60lbs. I'm just curious, not trying to solicit any particular response.
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Karl 
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#11
08-29-2017, 01:27 PM
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Quote:
a) Edge of regulation Ball to spring nut mounting surface 1.070" b) Spring free Length 2.300" (My spring was 2.292") c) Nut mounting surface to pump = .280" d) Depth of oil spring pocket on the nut = .443" f) Pump cover height = .625" So you have all of those different dimensions, all capable of changing during production. Luhn Performance actually built a 'Oil Pump Dyno' tester that seems to work well and can hit a oil pressure number really close. I believe that they did some actual shim thickness testing and know what a real shim does to the oil pressure. Might want to call them Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#12
08-29-2017, 05:25 PM
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Lets not over complicate this. I did a search on this a while ago and the consensus was .060. Some have used up to .100. That said if a .060 produces approximately a 10psi increase using the 60psi spring, a .100 shim is going to produce what? 76 psi or so?
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71 Formula 433, Splayed cap 400 block, 4" stroke Scat forged crank, 6.8 Eagle rods, custom Autotec pistons. SD 295 KRE D ports, Old faithful hybrid roller, Torker II, Holley Sniper Stealth, Tribal Tubes, TKO 600, 3.73 Eaton posi. |
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#13
08-29-2017, 05:32 PM
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Quote:
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"...ridge reamer and ring compressor? Do they have tools like that?" |
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#14
08-30-2017, 12:25 AM
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Well, I once used a 1/4 nut with the peaks rounded off on a 350 Chevy. It blew the filter up and made a nice mess of things.
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#15
08-30-2017, 03:01 AM
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.060 is worth 15lbs on a small journal with .0023" on the mains and .0028" on the rods and VR1 30wt. I think I used a AN washer.
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#16
08-30-2017, 03:03 AM
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Thats with a .034" lube hole in the front and back.
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#17
08-30-2017, 06:11 AM
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Thanks all for the recommendations, looks like a 0.060" shim.
__________________
1967 Firechicken, 499", Edl heads, 262/[email protected]" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. [email protected] mph with a 1.45 60'. Still WAY under the rollbar rule. |
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#18
08-30-2017, 07:15 AM
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Quote:
Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#19
08-30-2017, 07:41 AM
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I use a 5/16 lock washer that I flatten out. Usually gives me about 70 psi in a 60 pound pump. You might have to grind a slight amount off the OD of the washer to get it to fit inside the spring cap.
__________________
Todd Sedlmeier Who ever thought pinewood derby cars would lead to this! October 2004 HPP Shootout participate http://www.highperformancepontiac.co...out/index.html 86 Grand Prix 535 High Port 8.93 @ 153 65 GTO 433 High Port 12.04 @ 113 |
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#20
08-30-2017, 07:50 AM
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Quote:
__________________
1967 Firechicken, 499", Edl heads, 262/[email protected]" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. [email protected] mph with a 1.45 60'. Still WAY under the rollbar rule. |
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