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tylergeddis Samba Member
Joined: March 26, 2008 Posts: 348 Location: Whittier
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Posted: Wed Nov 19, 2008 10:08 pm Post subject: Porsche Pulley |
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I was interested in buying a Porsche Pully, but I have a few questions before a do:
1. How well would they work on a 40hp.
2. Where would you buy one original or repro?
3. Also do you have to buy a porsche crank or can you just bolt it on the stock crank. |
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gimmesomeshelter Samba Member
Joined: May 08, 2004 Posts: 1466 Location: San Carlos, CA
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Posted: Wed Nov 19, 2008 11:08 pm Post subject: |
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Hello-
1) The upside is that they look cool, and they lower the amount of HP consumed by the fan. The downside is that your fan won't blow as much air over your engine, so it will run warmer.
I believe Porsche was able to use them because they're engine ran at speeds much closer to the limit of the fan.
2) You can find used ones on eBay, or you can buy repros NLA Parts.
3) They'll fit onto a VW crank, but only the early ones will have the oil grooves. Most will require that you install a sand seal.
Paul _________________ "I would rather have questions that can't be answered than answers that can't be questioned."
Richard Feynman |
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oval56 Samba Member
Joined: July 21, 2003 Posts: 1309 Location: oktoberfest maintown
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Posted: Thu Nov 20, 2008 11:48 pm Post subject: |
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gimmesomeshelter wrote: |
Hello-
1) The upside is that they look cool, and they lower the amount of HP consumed by the fan. The downside is that your fan won't blow as much air over your engine, so it will run warmer.
I believe Porsche was able to use them because they're engine ran at speeds much closer to the limit of the fan.
2) You can find used ones on eBay, or you can buy repros NLA Parts.
3) They'll fit onto a VW crank, but only the early ones will have the oil grooves. Most will require that you install a sand seal.
Paul |
or machine a busching with oilgrooves (early pulley's are not easy to get)
_________________ www.oval56.com
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1957 Oval Ragtop 1584ccm singel port modified
1950 Hebmüller, 1584ccm okrasa modified
DBK Germany!!!!!!!!!!
www.dbkvw.com |
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the.fordhams Samba Member
Joined: February 11, 2004 Posts: 471 Location: Charlotte, NC
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Posted: Thu Nov 27, 2008 10:10 am Post subject: |
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It would appear there are also Porsche crank pulley's that are full width at 170mm - I have one - its a 4 hole OT - was this Okrasa VW? However, on measuring the diameter of the scroll seal it would appear to be 49.7mm - hence mine would probably leak unless I go sand seal with it. Oh well.
Now if you go for a smaller Porsche top pulley - 356's 96mm vs vw's 110mm - then you may be able to use those smaller OT Porsche crank pulleys and still turn the same speed? Maybe thats how Porsche got away with it?
I would have thought with our small width 40hp fans you'll need all the fan speed to keep a higher output / heat making engine cooled enough? On my 40hp big bore I went for an oversize bottom pulley like AC net sells with a stock 110mm top pulley. _________________ 63 OG Turkis Bug project
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53 0val Samba Professor
Joined: July 03, 2003 Posts: 11396 Location: Irvine, CA
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Posted: Sat Nov 29, 2008 4:36 pm Post subject: |
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oval56 wrote: |
gimmesomeshelter wrote: |
Hello-
1) The upside is that they look cool, and they lower the amount of HP consumed by the fan. The downside is that your fan won't blow as much air over your engine, so it will run warmer.
I believe Porsche was able to use them because they're engine ran at speeds much closer to the limit of the fan.
2) You can find used ones on eBay, or you can buy repros NLA Parts.
3) They'll fit onto a VW crank, but only the early ones will have the oil grooves. Most will require that you install a sand seal.
Paul |
or machine a busching with oilgrooves (early pulley's are not easy to get)
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Those are "easy" compared to a Pre-A pulley. _________________ "What a fool believes he sees, no wise man has the power to reason away." Dobee, Dobee, Do |
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