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posted on January 3rd, 2008 at 10:08 AM
porsche fan
hi anyone give me some advice on how fast i should spin my 12 blade fan on a type 4?
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66deluxe
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posted on January 4th, 2008 at 09:05 AM
as slow as you can, the air output of the 12 blade is too much and can actually make back pressure cause of air stagnating in the shroud as it can't
get past the heads and cylinders, this page has info on pulley sizes for 911 kits http://www.aircooledtechnology.com/cooling/index2.shtml
Have a good read, hope i helped you, Damo.
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I could not find that info, only info to use the sellers own system...
Quote:
Originally
posted by 66deluxe
as slow as you can, the air output of the 12 blade is too much and can actually make back pressure cause of air stagnating in the shroud as it can't
get past the heads and cylinders,...
According to the facts ('Jake-speak' for you), the original 12-blade flows less than all others. Key also is the drive ratio as you can see from the
list below from a french guy that collected all factory specs:
Early 911 245 mm fan with 1.3: 1 pulley ratio 1390 ltr/sec @ 6100 rpm
1976-77 five bladed fan with 1.8:1 pulley ratio 1265 ltr/sec @ 6000 rpm
1978-79 226 mm fan with 1.81:1 pulley ratio 1380 ltr/sec @ 6000 rpm
Turbo fan with 1.68:1 pulley ratio 1500 ltr/sec @ 6000 rpm
964 fan with 1.6:1 pulley ratio 1010 ltr/sec @ 6100 rpm
New twin turbo with 1.8:1 pulley ratio 1210 ltr/sec @ 6100 rpm.
Early 911 245 mm fan with 1.3: 1 pulley ratio 1390 ltr/sec @ 6100 rpm[/color]
1965-74/75...... 110 mm crank..................95 mm fan pulley
1976-77... ........130 mm crank..................83 mm fan pulley
1978-79............130 mm crank... ..............80 mm fan pulley
1980-89............120 mm crank..................83 mm fan pulley
