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Registered
Join Date: Aug 2002
Location: Galivants Ferry, SC
Posts: 10,550
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I *believe* ( it's in my notes somewhere but they are not in front of me as I write), that Porsche used 80, 83, and 95 mm fan pulleys....and something like 120 and 130 mm crank pulleys ( 110 -120 ?) throughout the aircooled years. Fastest fan speed is with smallest fan pulley combined with largest crank pulley. I think for the 78-83 model run, that different pulley combo's were used...so I think there is more than one answer for "3.0" cars. The 84-89 Carrera's used the same crank pulley ( again...from memory) as the latest 3.0's...but there is a speed up option when using a Turbo piece,....so therefore a larger crank pulley from a Turbo might be still be available as an upgrade.
I'm sure someone with a spec book handy could corroborate this...but it seems incredible that Porsche threw in the 80-83 variation on the fan pulley, which I always thought was too small of a difference to notice... yet only causes parts mix-up problems.
--Wil Ferch
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Wil Ferch
85 Carrera ( gone, but not forgotten )
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