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Thread: Davies-Craig EWP issues

  1. #1
    Join Date
    Dec 2014
    Location
    Los Angeles
    Posts
    229

    Talking Davies-Craig EWP issues

    Looking for others familiar with the Davies-Craig EWP controller (the earlier style, Model 8020). Mine has been acting strangely the last few months. It self-tests normally and follows the programmed profile until I accelerate. At that point, all of the indicator lights illuminate and both the water pump and fan activate. This lasts until I drop the revs below 3000, then all is back to normal.

    The specifications state that the voltage supply range is 11.5 -15vdc. My little alternator (40 amp, internally regulated) produces 14.5v when at speed (>2000 rpm). I have verified this with an external tester. It sure seems like a voltage related problem but it would have to reside in the mother board, I presume. I have traced and tested every wire and connection in the system with no luck so far. The coolant temp probe is a new Ford unit.

    This leads to the basic problem, an inability to get the engine up to normal operating temp, even after an extended drive. Yesterday it was in the 60s and all I could get was 130 on the oil and 140-150 on the coolant after a 30 minute spirited drive.

    Any productive suggestions would be greatly appreciated.

  2. #2
    Join Date
    Oct 2006
    Location
    South Lyon Michigan
    Posts
    206

    Default Engine temp

    Replace or pull the thermostat and check the temp which it opens at with a pot off hot water on the stove. I had the same problem even after installing a 92C thermostat, but I'm dealing with lower temps. I have a large rad and at the time I did not have a thermal by-pass for the oil cooler. After adding a block off plate in front of the oil cooler, warm up time was cut to the 10-15 minute range. I now have a Mocal thermo by-pass on the oil cooler, which works great. Dave W
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  3. #3
    Join Date
    Dec 2014
    Location
    Los Angeles
    Posts
    229

    Default Davies-Craig EWP issues

    As you can see in the attached photo, I have modified the cooling system by removing the internal water pump and eliminating the thermostat (as per the D-C instructions). By utilizing the D-C EWP controller, the thermostat value is set in the controller and it cycles the electric water pump and cooling fan (according to an internal program) as necessary to maintain the selected temperature. It originally worked quite well but more recently, it has become extremely sensitive to acceleration it seems. Aaaarrgh! I never presumed that I would need an oil cooler but I could certainly add one if necessary.






    Click image for larger version. 

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