shiming an oil pump?
Is this just shiming the oil psi control spring to get more psi out of a pump?
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Re: shiming an oil pump?
Yes.
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Re: shiming an oil pump?
How do you know what thickness shim to use to gain lets say 5 psi? Or is it just more of a guess? How much psi is to much psi?
I am working on and ls and wanted to add just a bit. The owner may one day want to go with a b16a head would this be a good idea (adding psi)? |
Re: shiming an oil pump?
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Re: shiming an oil pump?
You can use a washer.
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Re: shiming an oil pump?
shimming as that article suggests, you'll bump up you psi but at low and idle speeds your flow may not be there (not enough pressure to get past the spring) if your pump is old and slopped out
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Re: shiming an oil pump?
Ok nice my b oil pump has a y off the pump one to the oil psi control valve/spring and one going to the motor. So I should not have problems will low pressure at idle. I did a lot of measuring and found what the installed height of my oil spring is and what the shim I am using. It should bump installed height 4% but I do not think I will get 4% oil psi bump probably closer to 10%. I do not think springs are linier. My old machine shop had one off the valve spring tester I may con him into measuring the tension with a washer and with out to see when the spring will open.
I am planning on using a .065 shim LOL. My goal is going from 50 to around 55-58. Dose this all seam useless? Will to much psi hurt? |
Re: shiming an oil pump?
Originally Posted by c0mpl3x
but at low and idle speeds your flow may not be there (not enough pressure to get past the spring) if your pump is old and slopped out
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Re: shiming an oil pump?
Originally Posted by krustindumm
???
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Re: shiming an oil pump?
shimming the spring ONLY effects the bypyass pressure.
If the pump cannot meet the bypass pressure, shimming is useless. |
Re: shiming an oil pump?
Originally Posted by Mista Bone
shimming the spring ONLY effects the bypyass pressure.
If the pump cannot meet the bypass pressure, shimming is useless. |
Re: shiming an oil pump?
Oil pumps are positive displacement pumps. They pump the same volume of oil every revolution, your flow is always the same (minus losses due to wear).
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Re: shiming an oil pump?
more psi = more parasitic load.
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Re: shiming an oil pump?
Ok so I did a lot of measuring and found my springs installed height. So I am thinking my stock oil pressure is 50 min at 3500rpm. So I take the spring in and it test 21 at installed height then with one .060 shim 23 and another .060 shim 26. Shouldn’t it be around 50.
Ok so then I measure the oil psi control piston that is only .598 is there some crazy conversion out there. So I am thinking 50 pounds per square inch but the piston is not a full inch. Any idea to find out the true psi with out installing it. |
---- it I just got a new spring big diff. 8 pound more on instaled hight. Shimmed it .020. Done
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