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Thread: Electric Fan

  1. #1
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    Electric Fan

    Hi all

    can anyone tell me the best solutions for adding an electric fan to the rad
    if I remove the standard fan off the fan pulley, I have around 50mm clearance between the pulley bolts and the rear face of the radiator core
    does anyone know if there is an electric fan available that will slot into that gap

    Alternatively, has anyone put a fan in front of the rad in the gap between the rad and front panel
    Would the centre support for the slam panel need to be removed

    What are the best options for adding a fan

    Thanks in advance

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    Racer

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    Re: Electric Fan

    Most aftermarket electric fans are fairly slim 30 - 40mm would be fat one from memory and using the zip tie fixings through the core means no lost space. Or front mount - My Zetec converted RS2000 has a front fan that works fine but as std. the RS rad is set back compared to a normal Escort but in that case there is more room for a rear fan!

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    Spanner Monkey

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    Re: Electric Fan

    My fan is a pusher, mounted on the front with the brackets from Retroford with no problems. If I'm not mistaken Mk1 RS2000's had them mounted on the front.

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    Re: Electric Fan

    The fan needs to cover as much of the core as possible, ideally with a cowling,

    Puller fans are more efficient than pusher.

    And most fans will be at least 50mm thick at the motor section, and a little less elsewhere. Spal make a wide range and some of the best.

    Lots of others are a lot thicker.
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    Re: Electric Fan

    There's a PDF with all the Spal fan dimensions and data at this link...

    https://indd.adobe.com/view/dd4d901e...1-2fcb4ff0b3ba


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    Re: Electric Fan

    Quote Originally Posted by waverunner View Post
    If I'm not mistaken Mk1 RS2000's had them mounted on the front.
    They did but they were large Kenlowe items on a big steel frame and IIRC, the centre support for the slam panel had to removed.

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    Re: Electric Fan

    Fitted one to my Mk2 Mexico.

    Its in front of the rad, Its a Spal 14 Inch. Its tight but no cutting of support brace.

    On the subject of Fans lots of people put the sensor in the top hose which I think is wrong as it detects the water before the rad. A better option is after the fan, so bottom hose.
    I drilled a hole in the rad and soldered in a dry Pocket. If fitted in the bottom it will shut-off once the fan/rad has done its job and reduced the temperature.

    I use an Electronic ON/OFF device which can be set at any temperature and the best bit is the differential (Difference between on/off) can be set. Also has a handy LED read-out giving current temp.

    https://www.carbuilder.com/uk/digita...ler-thermostat

    Dont forget to put the fan through a relay.

  9. #8
    Racer

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    Re: Electric Fan

    Whether the sensor is in top or bottom hoses is immaterial as long as the trip temp is re-set lower in the bottom hose. The reason for using the top is that it is the hottest temp and once anything over 'normal', the fan should react and if you wire the fan to 'run-on' after ignition is turned off it will sense the hot water as although there is no pumped circulation, hot water will still flow up through the thermo-syphon effect and the fan can continue cooling.

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    Spanner Monkey

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    Re: Electric Fan

    I've also fitted a manual override switch too, just for piece of mind. We use to always fit these to our TVR's.

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    Re: Electric Fan

    Hear what your saying there Katana but surely if the radiator is doing its job and reducing water temperature without the fan running then the bottom outlet will be significantly cooler than the top. in other words the rad can do a perfectly good job of cooling the engine without the fan running. If the sensor is in the top surely fan would run even when rad is coping?

    My fan never runs unless car is stationary and ticking over for 10-15 mins. I can easily see the rad outlet temp increasing steadily via the LED readout, fan kicks-in at set temp then outlet temp reduces until fan stops. 10-15 mins later the whole thing repeats.
    I do admit though Im a H&V Engineeer by trade sop could be 'over thinking' all this a bit.

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    Re: Electric Fan

    A top hose sensor'd fan is set to operate only above 'normal' temps ie. if the system thermostat is a 75 deg one, then running normal temp could be 85 deg and the fan would be switched at 100 deg. As long as the delta across the radiator is taken into account when setting the trigger temp its almost immaterial where the sensor goes, subject to my 'run-on' comment previously

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    Re: Electric Fan

    Thanks all for your input. Some good advice
    What temp range switch should I be looking for when running the 1600 crossflow
    Thanks

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    Re: Electric Fan

    what temp thermostat is fitted? if you have an 82 degree stat then switch the fan on at say 88-90 degrees and off at about 80-84

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