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Old 03-16-2017, 09:44 AM   #11
Bitchin'57
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Originally Posted by roger1 View Post
Spal fans are brushless and can be run with a PWM setup. Spal sells their own PWM controller.
And btw, PWM does not reduce the voltage to the motors. It is basically a high speed switching system and uses timing to determine the speed the motors run.

I have seen some debate as to whether it is harmful to DC motors to run the fans with a 2-speed series/parallel system when 2 identical fans are used. However, GM used this design for years in their cars from the factory.
I'll go with GM on this one. I'm running 2-speed series/parallel systems in 2 of my cars. One with Spal fans and the other with Maradyne.
Thanks, Roger!
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Old 03-16-2017, 09:57 AM   #12
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I'm running 2-speed series/parallel systems in 2 of my cars. One with Spal fans and the other with Maradyne.
Roger, are you running a Dakota Digital PAC controller on both vehicles? What temp do you have them set at? Do you see temp swings on the gauge oscillating up to the "turn on" setting and back down to the thermostat temp in slow speed driving?
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Old 03-16-2017, 12:03 PM   #13
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Roger, are you running a Dakota Digital PAC controller on both vehicles? What temp do you have them set at? Do you see temp swings on the gauge oscillating up to the "turn on" setting and back down to the thermostat temp in slow speed driving?
Hi Don.
Yes, I'm using the DD controllers in both my Belair and '57 truck.
In the Belair, I set low speed on at 195 and off at 190 and high speed on at 210 and off at 200. The truck is the same except for high on is set for 205. In both, the A/C trinary switch will turn the fans on high when it closes. Both vehicles are running 180 thermostats.

At first I tried low on at 190 and off at 185 but I think it was fighting the thermostat a little so I changed it to 195/190.

My temperature gauge shows just what you would expect with these settings. So the answer to your question is yes. My Belair will never switch to high speed without the A/C running no matter how hot it is outside. Even with the A/C on and the car moving at anything more than a slow speed, it will never go to high. However, on a fresh start on a hot day the A/C will turn them on high before I get out of the driveway.

With the big radiator I have in the Belair, I could easily make it run cooler by switching the thermostat to a 160 and lowering the fan settings but I prefer to run the thermostat that is recommended for the Ramjet.
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