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Fitting Thermos And Removing Engine Fan?

hayden49

By hayden49,
in Engines & Forced Induction

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hayden49 Rising Star

hayden49

Posted
Posted

hey guys,

im thinking about going down the thermo fan path and scraping the engine fan.

im thinking of installing 2 thermos infront of the radiator and was wondering what sizes or brands will be a direct fit.

Taking off the engine fan saves a kw or two doesnt it? ive also heard that the thermos will do a much better job at cooling.

anyone got any ideas?

cheers

Craved Grand Master

Craved

Posted
Posted

have you done a search, been covered alot lately (last month or so)

depends on the fans you use and the shrouding you fabricate..

if your willing to spend the time to get it right (and the money) then go for it..

Shaun Mentor

Shaun

Posted
Posted (edited)
hey guys,

im thinking about going down the thermo fan path and scraping the engine fan.

im thinking of installing 2 thermos infront of the radiator and was wondering what sizes or brands will be a direct fit.

Taking off the engine fan saves a kw or two doesnt it? ive also heard that the thermos will do a much better job at cooling.

anyone got any ideas?

cheers

Yeah mate, i bought some EF Falcon thermos from a wreckers for $100 and placed them in front of my radiator (R32 gtst). Make sure you reverse the direction of rotation so that they push the air thru the radiator, not suck it thru it. Also, make sure you spend heaps of time fabricating (or modifying the OE one) a shroud so that when the thermos are on, no air escapes around the radiator. I found Clark Rubber to be a cold mine of sealing rubbers! Mine work much better than i expected, they push heaps of air. Ill try to find a photo for ya.

Shaun.

Oh yeah, ive got an air diversion plate that goes over the fans, so you cant even see em! I reckon they're great.

post-11456-1147772293.jpg

Edited by Shaun
hayden49 Rising Star

hayden49

Posted
  • Author
Posted

At the moment my r33 doesnt have a fan shroud even for the engine fan, dunno why just wasnt on the car when i bought it.

i heard that davies craig are good quality thermo fans?

i was reading up on the 2x14" vs 1 x 16" but didnt really get anything out of it.

how did you make a shroud so now air escaped around the radiator?

cheers

Shaun Mentor

Shaun

Posted
Posted

I just modified (extensively) the existing Falcon shroud, and made it fit to the contours of the chassis. I then put car door rubber on the edges of the plastic shroud so that no air could escape between the fans and the radiator. Its not an easy job, but the benefits are great.

Also, Original Equipment (OE) manufacturers will always make better cooling systems than aftermarket. Take note of the rake on the Davies Graig fan blades compared to the Falcon (or any other) fans. The Davies are inferior in my opinion. And its no good just bolting on a thermo with heaps of exposed radiator left around it.

Shaun.

hayden49 Rising Star

hayden49

Posted
  • Author
Posted

oh ok, i dont mind spedning abit of time and money fitting it myself and modifying it but i think ill need someone to help me with the wiring as to when the fans should switch on and off.

also was it $100 for both the fans?

Craved Grand Master

Craved

Posted
Posted

Shaun,

what temp based switch did you use to activate the thermos?

did you see any difference with the std shroud on v's off ?? as it would cause a restriction now that air is pushed through it rather than being pulled through it?

temp issues at idle in the city?

BezerkR32 Veteran

BezerkR32

Posted
Posted

Suggest you leave engine fan & find yourself a shroud, nothing will cool as good as the factory setup. It is a clutch fan so it only drags with high engine bay temp. will free spin on the highway. If you insist on going to electric fans your mate is steering you in the right direction with the Falcon fans, but take note to the importance of the shroud. Bolting Davies Craig fans directly to the core is a waste of tme.

At the moment my r33 doesnt have a fan shroud even for the engine fan, dunno why just wasnt on the car when i bought it.

i heard that davies craig are good quality thermo fans?

i was reading up on the 2x14" vs 1 x 16" but didnt really get anything out of it.

how did you make a shroud so now air escaped around the radiator?

cheers

blind_elk Grand Master

blind_elk

Posted
Posted

My own experience is that it's not worth an engine for the couple of kW you will release by removing the weight of the factory fan.

I found it difficult to get airflow through the radiator, so much so that even at fwy speed, a slight uphill would cause the fans to activate.

R33A31 Enthusiast

R33A31

Posted
Posted

Hi All, just finish my thermo fan installation. I'm using BMW e34 fan (17") . Install direct to the oe plastic shroud with rivet & aluminium bracket. The signal from relay connect to the temp. switch that locate at the bottom of the radiator. If connect from tem. switch that locate at the intake manifold ( beside the thermal transmitter) the check light will bo ON.

Once the themp raise to the working temp. the fan will be ON aorund 5 sec only.....

Is it my connection right ? Advise please

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