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cycling has-been
Join Date: Sep 2004
Location: Jersey Shore
Posts: 7,242
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spal fan - push or pull?
I'm about to order the parts I need for the fan install and have read most of the threads that deal with the upgrade.
question: why is the push fan recommended vs the pull fan? wouldn't it make sense to pull from the dead air space around where the horns were, rather trying to push air into that space? ...unless the fan is mounted on the horn side of the cooler, or is that the normal mount location? our host sells the factory install kit which includes horn relocation bracket, which leads me to believe the factory mounted it on the horn side. ...was the factory push or pull? now I'm thinking that a pull fan mounted on the tire side is the way to go. opinions.....rational? thanks Bill K
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73 911T MFI, 76 912E, 77 Turbo Carrera |
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11-08-2005, 06:12 AM
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Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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Most people say there isn't enough room between tire and cooler stone shield for a 'pull' type fan ... YMMV!
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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11-08-2005, 06:23 AM
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cycling has-been
Join Date: Sep 2004
Location: Jersey Shore
Posts: 7,242
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thanks, I'm guessing my 930 is no exception to the clearance issue, so I guess it makes sense to mount it away from the tire and all the tossed around debris anyway. a couple of rubber worms from the track would probably render it useless in no time flat.
so I'll go with a pusher on the horn side
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73 911T MFI, 76 912E, 77 Turbo Carrera |
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11-08-2005, 06:41 AM
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Registered
Join Date: Aug 2002
Location: Galivants Ferry, SC
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Factory is pusher...mounted on the front face of the cooler....that's how I mounted my 7.5" SPAL fan too.
Wil
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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11-08-2005, 07:38 AM
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Join Date: Jun 2004
Location: Sonoma County, California
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Bill, 7.5" pusher mounted on Horn side.
PM me your email address and I'll share pics with you (PM box now cleared out)
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Doug Andrews 1982 911SC Targa 2008 Silverado Duramax 3/4 ton 2004 Armada 1999 Honda XR400 |
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11-08-2005, 07:53 AM
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Join Date: Dec 2004
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Just finished my fan install on my turbo yesterday. 7.5" Spal pusher on the front(horn) side. Horn relocation was necessary but easy.
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11-08-2005, 07:25 PM
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cycling has-been
Join Date: Sep 2004
Location: Jersey Shore
Posts: 7,242
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OSI930...
did you go with the thermostat on/off,or a manual switch? thanks Bill K
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73 911T MFI, 76 912E, 77 Turbo Carrera |
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11-09-2005, 03:02 AM
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I'm just days away from switching out my trombone for a mocal unit and a fan man spal fan. I also ordered the thermostat and switch kit. I'm not sure where to install the thermal switch?
Could someone point me in the right direction--- BTW it will be on a 81 911 SC Mark
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1981 911SC Sunroof Coupe 2005 Volvo XC-90 2.5T Vans RV-8 Experimental Aircraft |
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11-09-2005, 04:51 AM
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I went with a manual switch for now but left everything set up to add a thermostat later if I choose to. I watch the oil temp gauge quite a bit so I will see how I do with a manual switch.
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11-09-2005, 05:24 AM
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cycling has-been
Join Date: Sep 2004
Location: Jersey Shore
Posts: 7,242
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OSI930;
please keep us posted as to how the manual switch works out. also interested in noise levels while idling in traffic. where did you get the 4 prong relay? thanks Bill K Grezdlitn : give dandrews64 a shout, he has been very helpful with advice & detailed photos.
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73 911T MFI, 76 912E, 77 Turbo Carrera |
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11-09-2005, 05:58 AM
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The noise level is not bad. It is not as loud as a late model car equipped with an electric fan on the radiator. I used a factory relay socket and relay and placed it in the opening where the cruise control would be if equipped.
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11-09-2005, 06:54 AM
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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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Re: spal fan - push or pull?
Quote:
(usually) A push will stir the air (better) causing more tumbling of air over the surfaces needing cooling.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong. Disclaimer: the above was 2¢ worth. More information is available as my professional opinion, which is provided for an exorbitant fee. 
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11-09-2005, 07:10 AM
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cycling has-been
Join Date: Sep 2004
Location: Jersey Shore
Posts: 7,242
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if mixing is the case would you recommend on the the "twisted" fans now offered by SPAL?
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73 911T MFI, 76 912E, 77 Turbo Carrera |
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11-09-2005, 07:21 AM
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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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I'm not familiar with the performance (fan curves) of the SPAL. They do seem to make a rugged package. Whether the blades are curved-back (twisted) or not, I doubt will make much diff' in over-all performance.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong. Disclaimer: the above was 2¢ worth. More information is available as my professional opinion, which is provided for an exorbitant fee.
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11-09-2005, 07:38 AM
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Push- most definitely! Why? How would the electric fan motor fare with 250-280 degree heat being blasted on it whenever the car started getting hot ? Won't last long and the plastic construction will get brittle a lot faster
Move the horns around to make space for the fan up front- it will be more efficient and reliable
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1970 914-6 street"evil cockaroach" 1970 911 Targa "ST" Jade Green IROC Tribute (ready to race) |
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11-09-2005, 08:36 AM
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Join Date: Aug 2002
Location: Galivants Ferry, SC
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The curved fan blades simply are for quiter operation....just like the 964/993 fan blades compared to originals.....may even flow less....
Wil
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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11-10-2005, 10:38 AM
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