Quote:
Originally Posted by euro911sc
Does an earlier fan actually provide better cooling?
|
According to what I've read, yes! One variable which I need to check into though is pulley sizes between the 3.2 and 3.6 setup.
From Bill V:
I don't have the pulley sizes, but here are the ratios and resulting air flows
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.
More info:
http://forums.pelicanparts.com/porsche-911-technical-forum/157478-3-6-fan-blade-911sc.html