recently I saw a lot of advertising for radiator fans.

either upgrading the size, proclaim highly rpm etc.

is there a need actually?
Does it really works?

by changing to such 'high speed fan', will it really make your car temp lower?
air con colder?

lower might not the best result bcause your engine need certain optimum temperature. but colder air cond might help.

if its really a large enough high speed fan, sure, how significant, who knows....

my car comes with 2 radiator fan.

just wondering if this is a good modification or just an old man myth..

Yes, it will make air cond cooler especially to some car known to be not cold during idling

Engine wise, colder too... but not necessarily better as engine need to hit certain temp to run at optimum


Next question is... is these high RPM fan gonna last for years? If it's not, its gonna give u alot trouble when it broke down

some car really comes with 2 fans. some only 1 for both aircond and radiator.

plus drain more battery power..yes,no?

well long as it really is able to transfer a larger volume of air, its not a myth.

I'm actually very curious to know..

as I know, my car when low speed, the air con is cold.
When the car goes fast, the air con is minimum..

was told the power actually goes to the other fan to facilitate the acceleration.

how true was that, I really don't know....

now this however i cannot brain......

im no mechanic but.... this sound like absolute nonsense

I wonder how high speed is high speed , the electrical system is only 12v , what you can achieve with that is limited , so really it might just sales tactic

yeah, the proclaimed speed is 12000 rpm while supplying power is the same.

I don't study electrical but if I recall correctly, in order to achieve higher rpm.
more power/voltage need to be supplied.

anyway I did a search online was found that the proclaim high speed fan doesn't really works at all.
even it does, its minimum.

the one that is proven is changing the radiator.
changing to a bigger or double layer, really helps to bring down the heat of the engine.

No point to treat a symptom without fixing the root cause

Original fans are more than enough unless driving under extreme condition like high load low speed towing

Ask aircon guy to reduce abit presure inside your colling system, at high rpm compressor will offen cut off to maintain pressure.

Voltage is still 12v but the current draw probably higher......12Amps instead of 8 Amps

Higher rpm, louder it gets but so e says if the wind is too strong then maybe the heat transfer wont be maximised vs slower speed fan.

Better put a fan shroud instead. Will channel all the air into a single location.

I think aftermarket high speed fan only helps if your radiator is not in good condition (partially plugged) and the thermostat is always full open to achieve maximum cooling. Else, it might cause engine to run below optimum temperature if the thermostat is stuck (it cannot close in to reduce cooling from radiator). Oh, and the noise from high speed fan is irritating.

I highly doubt it can achieve anything close to 12000rpm. That's 200 revolutions a second. Electric motors only those rotary tools, dentist drill and high end blenders reach that kinda speeds. All those have small, metal blades/tips. Your fan blade so long and made of plastic, sure will shatter. Also, the motor required to drive such a thing would be huge, cannot fit between your engine and radiator.

At this speed it will produce alot of sound at a high pitch. Quite scary.

This post has been edited by djtong: Dec 21 2016, 09:59 PM

i thought radiator fan uses cfm unit to measure the airflow volume instead of rpm, correct me if i'm wrong... saw some 800cfm, 1200cfm radiator fan before...

Correct, two measures for fans are CFM (volume of air moved) and static pressure (how strong it can pull air through the radiator). A fan with high cfm in the air might not have high cfm behind your radiator. RPM just tells you how fast the fan spins, without anymore info it's impossible to tell if it's a good fan or not.

Car companies spend millions daily to research cooling efficiency, if there is a better solution, it's them who'll introduce it, not some small fan company. Your high cfm fan at low speed can even restrict flow through the radiators at high speed.

while I have free time at Ipoh, I actually wrap the piping.

somehow or other, I actually felt the air con is much cooler.

could it be a placebo effect or really a fact