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shiming an oil pump?

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Old 02-28-2009, 06:19 PM
  #11  
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Default 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.
thanks for clearing up what i was trying to say
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Old 03-01-2009, 02:19 PM
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Default 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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Old 03-03-2009, 07:56 PM
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Default Re: shiming an oil pump?

more psi = more parasitic load.
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Old 03-03-2009, 09:13 PM
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Default 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.
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Old 03-07-2009, 07:04 PM
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---- it I just got a new spring big diff. 8 pound more on instaled hight. Shimmed it .020. Done
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Old 03-07-2009, 07:53 PM
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just do what this guy did.

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