Shimming an oil pump... How much is too much?
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Shimming an oil pump... How much is too much?
Just curious on what would be a "max" on shimming an oil pump...How thick of a washer is too thick? Looking for those w/ experience.
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From: The Dirty Hotness
Re: Shimming an oil pump... How much is too much? (Circuit Star-29)
don't shim it.... 
most people confuse pressure with flow.
More pressure does not equate more flow in this case.
You want more flow and shimming the pump does not give you that.
Try porting the pump instead....
most people confuse pressure with flow.
More pressure does not equate more flow in this case.
You want more flow and shimming the pump does not give you that.
Try porting the pump instead....
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Re: Shimming an oil pump... How much is too much? (RagingAngel)
I had considered this but porting would reduce pressure wouldn't it?
So, IMH it would seem reasonable to port the pump and shim the spring...Right?
So, IMH it would seem reasonable to port the pump and shim the spring...Right?
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From: The Dirty Hotness
Re: Shimming an oil pump... How much is too much? (Circuit Star-29)
Unless you intend to hog out the pump, the added flow you gain is not going to drop the pressure to a detrimental state.
I might consider shimming after porting if I was running an external oil cooler....but even those with this exact setup have not starved their motors or experienced excessive or even noticeably less pressure.
Just put the motor back together....
I might consider shimming after porting if I was running an external oil cooler....but even those with this exact setup have not starved their motors or experienced excessive or even noticeably less pressure.
Just put the motor back together....
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Re: Shimming an oil pump... How much is too much? (RagingAngel)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RagingAngel »</TD></TR><TR><TD CLASS="quote">
Just put the motor back together.... </TD></TR></TABLE>
its trying to come together...keep hitting roadblocks the size of a 747...
Just put the motor back together....
</TD></TR></TABLE>its trying to come together...keep hitting roadblocks the size of a 747...
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From: Hollywood Babylon
Ive never heard of this. Why are you trying to do this, what is it supposed to accomplish, and how do you actually go about doing it?
What does porting the pump housing accomplish?
What does porting the pump housing accomplish?
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From: Drinking Beer, UT
Re: (clip the apex)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by clip the apex »</TD></TR><TR><TD CLASS="quote">Ive never heard of this. Why are you trying to do this, what is it supposed to accomplish, and how do you actually go about doing it?
What does porting the pump housing accomplish?</TD></TR></TABLE>
Adding washers at the end of the pressure releif valve increases maximum pressure before the valve opens. Some believe the increase in oil pressure is beneficial, I've seen no proof of this being the case.
Porting the actual pump allows for a larger volume of oil to circulate for every revolution of the pump gear, thus more volume flow. However, when you increase volume, relative pressure drops, so compensating by shimming the pressure relief valve is one way to counteract the drop in pressure. The only problem with this is that the pressure relief valve determines maximum pressure only, and does not compensate for the slightly lower % of pressure at lower RPM's/load.
Cliff notes - Don't waste your time with shimming the oil pump.
What does porting the pump housing accomplish?</TD></TR></TABLE>
Adding washers at the end of the pressure releif valve increases maximum pressure before the valve opens. Some believe the increase in oil pressure is beneficial, I've seen no proof of this being the case.
Porting the actual pump allows for a larger volume of oil to circulate for every revolution of the pump gear, thus more volume flow. However, when you increase volume, relative pressure drops, so compensating by shimming the pressure relief valve is one way to counteract the drop in pressure. The only problem with this is that the pressure relief valve determines maximum pressure only, and does not compensate for the slightly lower % of pressure at lower RPM's/load.
Cliff notes - Don't waste your time with shimming the oil pump.
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