Thoughts on aftermarket fans.
08-01-2010, 12:40 PM
#1
Rainman
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Thoughts on aftermarket fans.
Friends, Rennlisters, Countrymen,
I live in quite a warm area and as such have a desire to keep my car running as cool as possible. After installing the low-temp fan switch, the low-temp thermostat, an external oil cooler the size of the moon and a low-temp oil thermostat, the next thing to look for is maximum airflow.
In some searches I have not come across any definitive answers of CFM flow for the stock 6-blade fans. They work well, yes, but if an aftermarket fan or fans can flow more air it should be better.
An example of what is available is here, http://cgi.ebay.com/ebaymotors/ws/eB...d=260635519247.
These fans are extremely cheap (I can buy 9 for less than one new 944 fan motor), can be mounted as pushers or pullers, and even the smallest one they sell (10") can flow almost 1600cfm at under 12 amps draw. I went out and measured yesterday and two of the 10" fans would fit in place of the stock 944 fans.
Another nice thing is that these fans are 2.5" deep, whereas the 944 fans are 4" deep from the radiator to the motor, another half inch or so if you count the plugs too. So if you put these on, you'd have an extra 2" of hand room in front of the engine, and could potentially flow over 3000CFM across your radiator while drawing under 24 amps.
Thoughts?
I live in quite a warm area and as such have a desire to keep my car running as cool as possible. After installing the low-temp fan switch, the low-temp thermostat, an external oil cooler the size of the moon and a low-temp oil thermostat, the next thing to look for is maximum airflow.
In some searches I have not come across any definitive answers of CFM flow for the stock 6-blade fans. They work well, yes, but if an aftermarket fan or fans can flow more air it should be better.
An example of what is available is here, http://cgi.ebay.com/ebaymotors/ws/eB...d=260635519247.
These fans are extremely cheap (I can buy 9 for less than one new 944 fan motor), can be mounted as pushers or pullers, and even the smallest one they sell (10") can flow almost 1600cfm at under 12 amps draw. I went out and measured yesterday and two of the 10" fans would fit in place of the stock 944 fans.
Another nice thing is that these fans are 2.5" deep, whereas the 944 fans are 4" deep from the radiator to the motor, another half inch or so if you count the plugs too. So if you put these on, you'd have an extra 2" of hand room in front of the engine, and could potentially flow over 3000CFM across your radiator while drawing under 24 amps.
Thoughts?
08-01-2010, 01:25 PM
#2
Race Director
I live in a warmer area than you. I think stock is fine if everything is good shape. If you are overheating it is due to some problem in the system. Fix that rather than change fans.
08-01-2010, 01:30 PM
#3
Rainman
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It seems one of my fan motors may be on its way out as it sounds like a bearing is going bad, so I am looking for a replacement. These fans seemed like a good possibility being thinner, lower power draw and huge airflow.
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08-01-2010, 07:58 PM
#9
But does anyone know how much air the stock 6 blade fan moves (on high speed)? If these aftermarket fans do draw significantly more air it sounds like a good idea to me.
08-02-2010, 02:39 AM
#10
Rainman
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3,000 cfm of cooling air is a nice thing to consider though...ill look into these some more.
expect an update after my upcoming thread about my new ac condenser.....
08-02-2010, 10:02 AM
#11
Three Wheelin'
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In the world of electric fans you get what you pay for. Problem with most cheap ones is that they have poorly made sleeve bearings and as they quickly wear the amp draw aka spike to start them becomes larger over a very short amount of time.
If you want to add some cooling benifit to your car add a fan to your oil cooler.
If you want to add some cooling benifit to your car add a fan to your oil cooler.
08-02-2010, 10:47 AM
#12
Burning Brakes
Look at the mounting system of the fan offered by 928 motorsports,simple and eficient.http://www.928motorsports.com/parts/auxfan.php
08-02-2010, 11:58 AM
#13
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Unless there is a good reason you need to go aftermarket (e.g., the 928 motorsports replacement fan to give enough clearance to fit their supercharger kit), keep in mind that when people look at the car to buy later on, some will think "wtf is that? what other el-cheapo non-stock weirdness has the previous owner bolted into this car?"
If you intend to be the car's last owner, not an issue, obviously. Otherwise, whenever you go non-stock, it is worth considering at least in passing what you would think if you found the same item on a car _you_ were considering buying...
If you intend to be the car's last owner, not an issue, obviously. Otherwise, whenever you go non-stock, it is worth considering at least in passing what you would think if you found the same item on a car _you_ were considering buying...
08-02-2010, 12:19 PM
#14
Race Director
I run a SPAL puller on my M Coupe on its own relay - its rated at 2070cfm, works great. I replaced both the aux fan and engine clutch fan...never seen a problem with the stock 944 fans though? Also the SPAL fan is pretty loud, doesnt bother me, but its worth mentioning.
08-08-2010, 02:38 PM
#15
Rainman
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In the world of electric fans you get what you pay for. Problem with most cheap ones is that they have poorly made sleeve bearings and as they quickly wear the amp draw aka spike to start them becomes larger over a very short amount of time.
If you want to add some cooling benifit to your car add a fan to your oil cooler.
If you want to add some cooling benifit to your car add a fan to your oil cooler.