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M20 running over 200°F

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    #1

    M20 running over 200°F

    Recently boosted my m20b25 and switched mechanical fan to electric. I am thinking my fan isn't providing enough airflow. I will run the motor at 205 degrees. Not running it really hard though. Should I just get a better fan. Any info would be great thanks!

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    #2
    I did the same thing with a thin SPAL eBay fan. 200F isn't uncommon. Stock is 192F and that had a clutch fan in it. Going to an electric isn't going to keep consistent temperatures so you have to keep that in mind.
    1989 325i - 2.7i, Holset H1C, 60lb injectors, whodwho MS-PNP.
    2012 Passat TDI - DD Duty
    2008 GMC Yukon XL Denali - Kiddie hauler/grocery getter

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      #3
      How large is the electric fan?

      Did you remove the fan shroud when the mechanical fan was removed?
      101

      The E30 collection:
      1987 325es M52 - Schwarz / Taurus Red Sport (son #2's)
      1987 325is - Delphin / Black Sport (son #3's)
      1987 325i Convertible - Triple Black
      1989 325iX Coupe - Diamondschwarz / Black Comfort
      1990 325iX Coupe - Sterling Silver / Grey Sport

      1981 Fiat 124 Spider 2000 - Green / Tan
      1998 Volvo V70 GLT - White / Tan
      1998 Volvo S70 T5 manual - White / Taupe
      2001 Ford Windstar - Silver / Grey (parts hauler)
      2006 Lexus GX470 - White / Tan (tow rig)

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        #4
        Never had the shroud. 12" fan ebay special lol. New thermostat and water pump. 12" fan must be the obvious reason because it is tiny. Wasn't sure if it is bad to run the motor that hot daily. Guessing a little cooler would be better for it. And also better performance

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          #5
          yup - the 12" fan is too small.

          I think 16" is the recommended size - but I've never converted one myself so search around in the forums for confirmation.
          101

          The E30 collection:
          1987 325es M52 - Schwarz / Taurus Red Sport (son #2's)
          1987 325is - Delphin / Black Sport (son #3's)
          1987 325i Convertible - Triple Black
          1989 325iX Coupe - Diamondschwarz / Black Comfort
          1990 325iX Coupe - Sterling Silver / Grey Sport

          1981 Fiat 124 Spider 2000 - Green / Tan
          1998 Volvo V70 GLT - White / Tan
          1998 Volvo S70 T5 manual - White / Taupe
          2001 Ford Windstar - Silver / Grey (parts hauler)
          2006 Lexus GX470 - White / Tan (tow rig)

          Comment

            #6
            Originally posted by redsubdivisions View Post
            I did the same thing with a thin SPAL eBay fan. 200F isn't uncommon. Stock is 192F and that had a clutch fan in it. Going to an electric isn't going to keep consistent temperatures so you have to keep that in mind.
            I have an electric fan and my temperatures are pretty consistent, only vary by like 5-10 degrees. I have it wired up to be turned on by a switch so I can have it consistently on, or turn it on when I'm stuck in traffic. My car runs at or below the quarter mark on the temp gauge when driving with the fan off, and when stuck in traffic with the fan on, it's on the quarter mark.

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              #7
              If you have high temps when you're stopped, you can blame the fan.

              If it stays up at cruise, (35+) it's probably the thermostat.

              If it CLIMBS at cruise or under hard throttle, blame the radiator.

              Over about 25 mph, natural airflow is more than any fan can manage
              t
              now, sometimes I just mess with people. It's more entertaining that way. george graves

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                #8
                Okay thank you everyone!

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