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10th August 2014, 08:14 PM
#1
Old style thermo fan fitting
Hi all,
I've been thinking about replacing the engine driven fan on my Series 3 2.25 diesel to coax a couple more hp out of it and to cut down on noise. I have a 1970s thermo fan lying around - it's off a Renault 16 and has a Preslite motor (presumably to meet local content requirements at the time). It's old and probably not as efficient as a new one but it does the job on my Renault 16. Am I crazy thinking about fitting one or two of these to a 2.25 diesel?

many thanks
Phin
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10th August 2014, 08:40 PM
#2
In my opinion, if they aren't in a cowl , then yes,
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10th August 2014, 09:13 PM
#3
Thanks Gary. I forgot to mention that I'd have to mount the fan as a pusher as there's not enough space otherwise. Does this remove the need for a cowl?
cheers
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11th August 2014, 07:51 AM
#4
IMHO , 2 may work if you cover the entire radiator . By that I mean that they are staggered so that at least a good proportion of all the radiator fins/cores are covered.
Have you determined what amps the fans are? Were they the primary cooling fans of the 16 ? I cannot recall from mine as it was 40 years ago.
You cannot use a cowl for pushers but cowls increase the efficiency of pullers enormously.
It also depends on how you use your car. if only on road and traffic they may work , but this is unlikely if you do low range work in hot weather.
Regards Philip A
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12th August 2014, 07:31 AM
#5
I ran a manually switched electric fan on my series 3 diesel tray back with the result you are looking for. Much quieter and a bit more power. Heater works better/warms faster.
Usually only needed in traffic but never really tested hard in low range off road 1st gear. There is one apeture I was considering blanking off to increase the ram air push but never got around to it.
Remove the cowl on the inside ( engine) side to allow max airflow with the pusher fan.
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12th August 2014, 08:12 AM
#6
If you are trying to use it as a pusher, you have to flip over the fan on the motor shaft. It's currently set up as a puller. No good trying to push air with the fan blades curved the wrong way. You don't need a separate cowl so long as the one built into the fan assembly is close to the radiator core.
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12th August 2014, 06:53 PM
#7
Thanks all,
I'm not sure how many amps the fan draws, it was used as a single puller fan on the Renault 16 without a cowl and generally performed well. I'm still in two minds - I generally don't want to introduce more complexity but I don't want noise either. Decisions decisions.
cheers
Phin
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