Porsche 911 cooling fans

[drgouk]

What model porsche 911 cooling fan assembly is the most efficent? the 245mm 911 turbo or are the 964/993 cooling fans just as good? Also how do the fans from BAS, GWD and CSP, compare to the genuine porsche part?
Looking for one to cool my Pauter engine. Please let me know. Thanks

[WCB Hitler's Hot Rod]

Mine's CSP but they don't make them anymore. FYI, I was looking at the Autocraft website and they list them there.

[JIMP]

Hello

why don't you ask Pauter as he has a Porsche shroud on his Ghia's engine, and If I remember correctly he even sells this shroud (don't know thow if he sells a complete kit or the shroud seperately)

Friendly

Dimitrios

[vwcab]

Mine's CSP but they don't make them anymore. FYI, I was looking at the Autocraft website and they list them there.

Hi Steve,I just looked in the CSP-catalog and on their website:and it's still available(porsche style cooling system for T1 &T4).

Peter   

[Udo]

Hi David

The best cooling systems that are avaliable are our grman Type 4 . They will fit to the pauter heads but i do not know about the Pauter case ...
CSP's must be avaliable
Udo

[Airspeed]

I had a list somewhere about all cu.ft/min of air all the several types of porsche fans moved, complete with drive ratios.

For the best cooling efficiency, you 'may' want to look at other aspects of the cooling than just cu.ft/min  The type of shroud used is very critical too and pls don't ask me what 'the best shroud' is 

[Lee.C]

Here's my friends porsche fan on his type1 1915cc with GWD airbox:)

[drgouk]

Thanks for the replies, good info. I have another Question, What are the 993 cooling fans like? better than the earlier 11 blades?

[j-f]

Here's my friends porsche fan on his type1 1915cc with GWD airbox:)

That's a really clean looking set up!
Who did the front engine tin? Looks really well done.

About the efficiency of the Porsche cooling, a friend runs a Weytal shroud which was especially design to cool a 4 cylinders.

[Airspeed]

Thanks for the replies, good info. I have another Question, What are the 993 cooling fans like? better than the earlier 11 blades?

The original 12-blade delivers less cu.ft/min air then an original 11-blade.
Less air does not always mean its a lesser fan...
Sometimes too much air only stalls the fan and if the fan can't get all that air pushed through the fins, it only costs more power and cools less. Proper air direction, read: less turbulence inside the shroud is where its at 

[bugnut68]

I'm under the impression that the stock doghouse or DTM shrouds are more efficient in cooling than the Porsche set ups?  At least stateside, I don't know much about the European systems available...

[Airspeed]

As promised:

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][/b]


..................diameter (mm).........rpm.........pulley ratio....speed (ft/sec)

early 911................245..............6100............1.3 ..............334

76-77 5 blade..........245..............6100............1.8...............462

SC.......... ...............226..............6100............1.8...............426
.
930..........................245.............6100...........1.68...............431

964/993................... 279.............6100............1.6...............468

993tt.........................279.............6100............1.8...............526


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

fan sizes / blades / air flow:

1965-74/75........245 mm / 11 pales.........1.3:1 ratio..1390 liters air/sec
1975/76- 77......245 / 5 pales..................1.8:1 ratio....1265 l/sec
1978-79............226 / 11 pales ...............1.8:1 ratio...1380 l /sec
1980-89............245 mm / 11 blade.........1.67:1 ratio...1500 l/ sec
964...............279mm / 12 blade......... 1.6:1 ratio..1010 l /sec (!)

The 12-blade only uses 8,1 hp at 6100 rpm 

[drgouk]

Thank you Airspeed for taking the time to post that valuable info.