Boundary Engineering Oil Pump
12-02-2009, 10:15 PM
#6
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I believe that the pumps on the VVT cars are different, but otherwise they should all interchange.
One curious thing I noticed while tearing down my '99 engine is that its oil pump has BP4W cast into it. Can't find any other differences.
One curious thing I noticed while tearing down my '99 engine is that its oil pump has BP4W cast into it. Can't find any other differences.
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12-03-2009, 02:15 AM
#8
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i hope there is no difference with the bp4w pump, which is the head i plan on running. i bought the blue printed pump. i compared it to a new one and the gears dont seem much if any thicker? i can take some pics if needed. also i was wondering if they shim the spring to help out with oil pressure
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12-03-2009, 05:07 PM
#11
Hey guys,
The springs in them are 64-66psi normal operating temp springs. So they do run on the high side of the specification. The difference in gear thickness is not something thats going to be easy to see without a set of calipers, but the percent increase is 30% on the 91.5-00 gears, and about an 18% increase over the VVT gears which are already thicker then the earlier model gears.
I do have an ultra high flow pump sitting on my desk that has humongously thick gears. We did a bit of trick machining to keep everything in the correct place. If anyone wants to test them you can have them for the price of the high flow oil pump gears. We also shimmed this spring, so it should put out more like 80PSI compared to 64, and the normal pressure that oil pumps maintain which is 45-50psi.
Best,
Travis
The springs in them are 64-66psi normal operating temp springs. So they do run on the high side of the specification. The difference in gear thickness is not something thats going to be easy to see without a set of calipers, but the percent increase is 30% on the 91.5-00 gears, and about an 18% increase over the VVT gears which are already thicker then the earlier model gears.
I do have an ultra high flow pump sitting on my desk that has humongously thick gears. We did a bit of trick machining to keep everything in the correct place. If anyone wants to test them you can have them for the price of the high flow oil pump gears. We also shimmed this spring, so it should put out more like 80PSI compared to 64, and the normal pressure that oil pumps maintain which is 45-50psi.
Best,
Travis
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12-04-2009, 02:11 AM
#13
Hey guys,
The springs in them are 64-66psi normal operating temp springs. So they do run on the high side of the specification. The difference in gear thickness is not something thats going to be easy to see without a set of calipers, but the percent increase is 30% on the 91.5-00 gears, and about an 18% increase over the VVT gears which are already thicker then the earlier model gears.
I do have an ultra high flow pump sitting on my desk that has humongously thick gears. We did a bit of trick machining to keep everything in the correct place. If anyone wants to test them you can have them for the price of the high flow oil pump gears. We also shimmed this spring, so it should put out more like 80PSI compared to 64, and the normal pressure that oil pumps maintain which is 45-50psi.
Best,
Travis
The springs in them are 64-66psi normal operating temp springs. So they do run on the high side of the specification. The difference in gear thickness is not something thats going to be easy to see without a set of calipers, but the percent increase is 30% on the 91.5-00 gears, and about an 18% increase over the VVT gears which are already thicker then the earlier model gears.
I do have an ultra high flow pump sitting on my desk that has humongously thick gears. We did a bit of trick machining to keep everything in the correct place. If anyone wants to test them you can have them for the price of the high flow oil pump gears. We also shimmed this spring, so it should put out more like 80PSI compared to 64, and the normal pressure that oil pumps maintain which is 45-50psi.
Best,
Travis
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0
12-04-2009, 07:14 AM
#15
Hey guys,
The springs in them are 64-66psi normal operating temp springs. So they do run on the high side of the specification. The difference in gear thickness is not something thats going to be easy to see without a set of calipers, but the percent increase is 30% on the 91.5-00 gears, and about an 18% increase over the VVT gears which are already thicker then the earlier model gears.
I do have an ultra high flow pump sitting on my desk that has humongously thick gears. We did a bit of trick machining to keep everything in the correct place. If anyone wants to test them you can have them for the price of the high flow oil pump gears. We also shimmed this spring, so it should put out more like 80PSI compared to 64, and the normal pressure that oil pumps maintain which is 45-50psi.
Best,
Travis
The springs in them are 64-66psi normal operating temp springs. So they do run on the high side of the specification. The difference in gear thickness is not something thats going to be easy to see without a set of calipers, but the percent increase is 30% on the 91.5-00 gears, and about an 18% increase over the VVT gears which are already thicker then the earlier model gears.
I do have an ultra high flow pump sitting on my desk that has humongously thick gears. We did a bit of trick machining to keep everything in the correct place. If anyone wants to test them you can have them for the price of the high flow oil pump gears. We also shimmed this spring, so it should put out more like 80PSI compared to 64, and the normal pressure that oil pumps maintain which is 45-50psi.
Best,
Travis
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0
12-04-2009, 02:39 PM
#16
The basics of it is this:
The bearings are supported by fluid flow, not by oil pressure. Oil pressure does increase flow though so they are linked. The stock engines are built around very tight tolerances which is actually the opposite of what you want in a race motor when it comes to bearing clearances not necessarily anything else. The bigger a bearing clearance is (upto a certain point) the more flow that goes through the bearing and the more load it can support.
So to take even more advantage of the high flow oil pumps you'd want to go through and design all the clearances wider so your using the high volume part of the pump and not just dumping it back into the oil pain with the relief valve. The high volume pumps do offer some advantages over standard pumps in that you build pressure much quicker in the RPM range. This is kind of a big deal for the guys with quick spooling turbos because the torque and the bearing load comes on a lot sooner then when you hit the relief valve pressure.
So this is how I would break it down:
Anyone whose running a race motor of up and over 7500 RPM with looser clearances would really benefit from the high volume oil pump assemblies turbo or non.
Guys running tight tolerance motors with large turbos or no forced induction would be best off running just the billet oil pump gears.
Guys that are running small turbos on an engine with tight or loose clearances would benefit from a high flow pump.
The bearings are supported by fluid flow, not by oil pressure. Oil pressure does increase flow though so they are linked. The stock engines are built around very tight tolerances which is actually the opposite of what you want in a race motor when it comes to bearing clearances not necessarily anything else. The bigger a bearing clearance is (upto a certain point) the more flow that goes through the bearing and the more load it can support.
- The high flow oil pumps prevent failures like rotating a bearing.
- Keep piston temps low by making sure the oil squirters operate at full flow.
- Keep oil temperature more stable.
- The system is blueprinted so you can count on it to be in spec.
So to take even more advantage of the high flow oil pumps you'd want to go through and design all the clearances wider so your using the high volume part of the pump and not just dumping it back into the oil pain with the relief valve. The high volume pumps do offer some advantages over standard pumps in that you build pressure much quicker in the RPM range. This is kind of a big deal for the guys with quick spooling turbos because the torque and the bearing load comes on a lot sooner then when you hit the relief valve pressure.
So this is how I would break it down:
Anyone whose running a race motor of up and over 7500 RPM with looser clearances would really benefit from the high volume oil pump assemblies turbo or non.
Guys running tight tolerance motors with large turbos or no forced induction would be best off running just the billet oil pump gears.
Guys that are running small turbos on an engine with tight or loose clearances would benefit from a high flow pump.
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