#16
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My 911 kit came with a 1.6-1 crank pulley, I bought a smaller pulley from Fat Performacne that is 1-1.
ken |
#17
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For your info:
Latest dyno test showed that the fan took 6hp on Zen's engine. If you get a pulley with a 1:1 ratio the Porsche shroud will NOT work that well. Please wait a week or two.....I have some really good infos for my article. Alex |
#18
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Just picked up 11 blade fan kit, all for $320. Not bad hey?? Dry sump here we come, just gotta get the cash to finish the 2332 and it can all be installed
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1969 VW aka Suicyde www.geocities.com/suicyde_vw Tony__Z@hotmail.com |
#19
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....
For sure you have to interchange pulley-diameters, just to get the correct ratio.
A safe thing, to be warned, that the diameter is too small is, if the generator light comes on! LOL 5 blades for president! 12 blades are good, but...! 11 blades provide best airflow, besides it's less noisy than the 5 blades! Problematic is, that you can't get the 11 blades new.
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Click here to mail me! |
#20
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So there is no real problem running a 5-blade fan? I am having a hard time locating an 11-blade fan. Would it cause any problems or should I keep looking for an 11-blade?
Thanks, fast70 |
#21
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Think about it this way, the 5, 11 or 12 blade was designed to cool a lot more power, cylinders, boost and heat than we will ever need.
The only problem with running a 5 blade fan that I can think of is as follows. I dont like the look. Yes, if nothing else was available, I would run a 5 blade (almost did too), in all honesty, I REALLY REALLY REALLY REALLY like the 12 blade, but those cant be found in SA, so I opted with the 11 blade. It all boils down to looks!!! They each have their specific design application, which is much more than we need anyway.
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1969 VW aka Suicyde www.geocities.com/suicyde_vw Tony__Z@hotmail.com |
#22
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Yeah,
I don't know what I was thinking! As if the fan for a 6-cyl would'nt be good enough for a 4-cyl. Thanks for showing me the logic! Thanks, fast70 |
#23
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The 5 blade fan was introduced to the 2.7 911 in the mid 70's to make the engine run hotter in order to reduce exhaust emissions.
How do I know? I have a mid 70's 911 and every thing I have read about it tells me to upgrade to the 11 blade fan before the engine overheats and pulls the head studs out of the case. So the 5 blade fan cools less. To confuse things even more there were 2 sizes of pulley too. Tim |
#24
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Yeah,
I think I read that in a Porsche manual once. They did it in order to reduce emissions by making it run hotter. fast70 |
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