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david_594
Samba Member
Joined: November 08, 2006
Posts: 484
Location: Columbus, OH
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 Posted: Sat Jul 21, 2007 2:54 pm Post subject: Oil pump for new bone stock 1600DP motor? |
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I have a 1968 westy and I am essentially build a brand new 1600 dual port motor for it. According to the bentley manual there was a mid year change in 71 from the 21mm oil pump to the 26mm oil pump. So my question is which one would be better to use in my motor.
The motor is 100% stock with new AS41 cases, reground crank, refurb rods, new cam, new dished piston and cylinder set, all original tin and thermostat, stock exhaust, stock carb, stock 4200 RPM rev limiting rotor, dvda dizzy... as bone stock as I an possibly make it.
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1968 westy weekender
2000 jetta tdi
79 vespa p200e |
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 79848
Location: Sneaking up behind you
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| Posted: Sat Jul 21, 2007 3:00 pm Post subject: |
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I'd go with the 26mm pump. If you were building a 1500 that would be a different story.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
Member #1009
#BlueSquare
עַם יִשְׂרָאֵל חַי |
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rterfert
Samba Member
Joined: October 08, 2003
Posts: 1419
Location: Yuma Arizona
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| Posted: Sat Jul 21, 2007 3:01 pm Post subject: |
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| A bigger oil pump is a plus...might be a little more draw on the HP but better oiling is what your looking for. |
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KTPhil
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Joined: April 06, 2006
Posts: 36049
Location: Conejo Valley, CA
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| Posted: Sat Jul 21, 2007 3:07 pm Post subject: |
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| Bill Fisher's book talks about "blueprinting" a stock pump for best performance. It means checking the gears for good mesh, and reducing the clearance at the cover plate to only the gasket thickness. I've not done it, but it sounds like good advice. |
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Glenn
Mr. 010
Joined: December 25, 2001
Posts: 79848
Location: Sneaking up behind you
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| Posted: Sat Jul 21, 2007 3:08 pm Post subject: |
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| KTPhil wrote: |
| Bill Fisher's book talks about "blueprinting" a stock pump for best performance. It means checking the gears for good mesh, and reducing the clearance at the cover plate to only the gasket thickness. I've not done it, but it sounds like good advice. |
You need to make sure the pump ports match the holes in the case. Many times they're a restriction because they are not lined up.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
Member #1009
#BlueSquare
עַם יִשְׂרָאֵל חַי |
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thetravman
Samba Member
Joined: February 16, 2006
Posts: 509
Location: Pounding out center main . . .
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| Posted: Sun Jul 22, 2007 10:15 pm Post subject: |
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| Glenn wrote: |
You need to make sure the pump ports match the holes in the case. Many times they're a restriction because they are not lined up. |
Can this only be done with the case split?
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joe cool
Samba Member
Joined: August 20, 2006
Posts: 1262
Location: Yolo County CA
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| Posted: Sun Jul 22, 2007 11:28 pm Post subject: |
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Dual relief case = big pump
Single relief case = small pump |
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joe cool
Samba Member
Joined: August 20, 2006
Posts: 1262
Location: Yolo County CA
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| Posted: Sun Jul 22, 2007 11:34 pm Post subject: |
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| Just to bitch, a 1600 dual port in a '68 bus is not "bone stock". You need a '71 bus to go with your engine. |
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