How Important Are Thermo Fans?

[Matthew Squarepants]

Hey guys,

Changing my radiator this week and was wondering how important are thermo fans? Do you need to get them, or could I just change the radiator without them?

Car is a R34 GTT 220kw daily driven for now although I plan to take it to the track in the future sometime.

Any help will be appreciated.

[niZmO_Man]

The fan between the engine and radiator? Very.

[GTRPSI]

You mean electric fans, instead of clutch fans.

Many here will tell you the clutch fan works better, flows more air than the electric thermo fans.

There was a thread about it a while back....

[mistermeena]

you need something to draw air through the rad when the car is stationary, and you also need the shroud that's on there. I just retained the clutch fan and factory shroud but you can make it work with electric thermos if that's what you want to do.

[Matthew Squarepants]

So it'll be alright just to change the radiator to an aftermarket one while keeping the factory fan with shrouds and everything else, yes?

Just have a bunch of car guys at work saying I need to buy thermos when changing to aftermarket radiator... Then have other guys telling me I don't

[Trex]

Measure everything and that should tell you. Have a friend with an alloy rad and clutch fan with shroud. I'm unsure of type and measurements though.

Why are you upgrading if it's just a daily?

[Ben C34]

Clutch fan no worries.

There's certainly not a rule of have to go to thermos when changing radiator.

[75coupe]

Is you existing radiator stuffed?

Is your car overheating from radiator problems?

Has the radiator got a leak?

If the answer is no why change it?

Im still running the original radiator with no issues and have modified pretty much everything except motor internals...

But yeah from others experiences std clutch fan works best

[Dan_J]

no clutch fan, running thermos works fine

if your new rad is too thick and you can't run the clutch fan, get 'S' bladed fans as they work heaps better then straight ones

[Matthew Squarepants]

Yes radiator is stuffed! Was going to source out a cheap oem radiator until I found a good deal on a brand new Koyo rad I couldn't pass up. He's also selling thermos for an extra $50 and insists on me buying them. So I was asking around for advice and decided I'm going to stick with the clutch fan.

Thanks for the help guys.

[jjman]

no clutch fan, running thermos works fine

if your new rad is too thick and you can't run the clutch fan, get 'S' bladed fans as they work heaps better then straight ones

when I was doing my research on thermofans it was said that straight blades are better, just noisier. (sblades have less surface area at the tips where the most velocity is and air moving potential).

Can you clarify this?

[mic087]

Yes radiator is stuffed! Was going to source out a cheap oem radiator until I found a good deal on a brand new Koyo rad I couldn't pass up. He's also selling thermos for an extra $50 and insists on me buying them. So I was asking around for advice and decided I'm going to stick with the clutch fan.

Thanks for the help guys.

Be sure to measure and make sure it will fit in with your standard clutch fan...

If not I would grab the offer now @ $50 extra for thermo fans... most thermos fan kits with an aluminimum shroud for an R33 go for about $100 on ebay

[89CAL]

when I was doing my research on thermofans it was said that straight blades are better, just noisier. (sblades have less surface area at the tips where the most velocity is and air moving potential).

Can you clarify this?

Sounds about right, this is worth a read

[Dan_J]

s blade fans should create a 'whirlwind' effect where as straight fans just more the air all about

[mad082]

The majority of cars with thermo fans factory just have straight fins, so they can't be that bad.

[jjman]

s blade fans should create a 'whirlwind' effect where as straight fans just more the air all about

got any research to back this up? iv never heard of this factor...