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The Meziere pump is noisy. And I wanted to have the HE fans (Afco
prefabbed shroud) come on as need so that they
weren't wailing away all the time. So I designed a voltage
dropping system for the Mezeire and a used a SPAL PWM radiator fan controller
for the heat exchanger fans. The
SPAL controller has low (50% power) and high (100%) set points for the fans to come on. The SPAL can read an aftermarket sender output, but I did not have good results using this method tapping into a Nordskog sender. So I ordered the self-powered SPAL temp sender, and added another boss to the outlet side end tank (not shown in the early mockup photo below).
The senders shown go to an digital temp gauge. One measures the fluid going in, the other the fluid going out. This allows for optimizing the drop across the heat exchanger.
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For the dropping resistor, figuring 6.5 amps for the pump (Mezeire states that "under normal use the pump will draw 6-7 amps"), to drop the voltage 5 volts, I needed a .77 ohm resistor, with at least a 25 watt power rating (a nifty dropping resistor calculator is here). So I used an MSD Ignition ballast resistor, a beefy .8 ohm ceramic part rated at 200 watts. it works perfectly. The pump is reasonably quiet now, and still flows way more than the stock pump. I used the stock pump output to turn on both the pump and the SPAL controller. For the pump, I added a relay and a fuse. The stock wiring may be beefy enough, but with the Mezeire flowing four times more than stock, it made sense to use a relay. |
The
harness also does not show the wire for the SPAL sender. I
runs in the same branch as the gauge senders. Note also that I
had to change the mounting location of the SPAL after I decided to
retain the hood latch (I was originally planning to use hood pins
only).