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Why don't we monitor crankcase temperature?

in 912 / 914 Technical Questions 7 years ago

  • Re: Why don't we monitor crankcase temperature?

    by » 7 years ago

    Thanks Bill for the idea of using the second port ,as opposed to making an adapter in the return line of the active port.
      
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  • Re: Why don't we monitor crankcase temperature?

    by » 7 years ago

    Thanks Glenn for the explanation.
    I'm quite surprised that there is so lttle difference between in & out.
    Could the readings have been affected by the tolerance of the sensors used? These sensors are known to have very low precision.
    If the coolers had such a low efficiency, why would we bother with installing them anyway?
    Eliminating the oil cooler would reduce the restriction in the oil circuit, thereby augmenting the pressure, which is a good thing.
      
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  • Re: Why don't we monitor crankcase temperature?

    by » 7 years ago

    Hi Guy,
    the coolers do NOT have low efficiency, in fact they are very good. When we contracted a Professor of Chemical engineering process control to set up a cooling and radiator rig he explained that the results were normal, you see a very small drop in temp. There is a multi-factorial equation that I cannot remember which involves airflow, temp rise in the airflow through the heat exchanger, fluid flow and temp drop in the fluid. The "take home answer" is that with high fluid flow you only see 1-2 degrees drop.

    IF you see 5 degrees drop then your fluid flow is too low and you need a far larger heat exchanger, therefore the right decision is to Increase the fluid flow. The actual "heat dumped" equation pushes you to a small temp drop but a very high fluid flow rate.

    I do not know what results you will get with a Rotax, but they are clever engineers and I am sure worked this stuff out 20+ years ago. Will be interested in your results.
      
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  • Re: Why don't we monitor crankcase temperature?

    by » 7 years ago

    Thanks Glenn, now that makes a lot of sense. I was a bit dense at first.
    It will be educative to see the result once I've made the mod.
    Now I won't be alarmed if I don't see a large drop in temp.
      
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  • Re: Why don't we monitor crankcase temperature?

    by » 7 years ago

    That is exactly what I like about this forum, guys!
    Thank you, good stuff.
    Peter
      
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