Low speed on electric fan

[StagJonno]

Agree with your concerns on the grounding issue, Terry. Think a single relay shorting out the pot is worth trying. I have a further concern as to how well the PWM would handle the fan becoming a generator with the airflow causing an increased fan speed over the set speed, though unsure how likely that would be (I recall having issues in this area with variable power supplies in the past, though this was with power electronics of at least a couple of generations ago). A series diode (or even a bridge rectifier) between the PWM and fan might sort this.

I too am planning to fit a Davies Craig EWP in the near future so would be interested to hear how you get on. From the operating chart, the fan is at least a straight on/ off rather than proportional control. Chart for Davies Craig EEWP.jpg

Short of modifying the radiator mountings to move it closer to the front of the car, I can't see there being space for a puller fan.

Jonno

[trunt]

Ok Jonno,

Yes a wire is taken to ground to turn the fan on.

I’m not totally sure on exactly where I will mount the Davis Craig yet, their info shows it front left, most people seem to put it on the right after moving the alternator but I don’t want to move the alternator as I want to keep the possibility of air conditioning open. I suspect there may even be more space on that side without the battery box.

Another reason I had for considering removing the mechanical fan was that it may make the piping across to that side a little easier - no fan to negotiate. I’ll only really be able to make these decisions once I get the engine in, and that will be a few months yet, I’m still on the mend.

I just worked out there was only 2 inches or less there so yes the puller is out without major mods.

Terry