Home Forums Rotax Max Large temperature deviations

This topic contains 4 replies, has 3 voices, and was last updated by  Eric Alexander 1 year, 1 month ago.

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  • #4733

    Eric Alexander
    Participant

    I’ve been running alot lately trying to get my two karts very close in overall performance and feel – so collecting alot data basically.  One engine (both are Rotax Sr) has a very smooth temperature plot in AiM Race Studio.  This engine never deviates more than 3 or 4 degrees over a lap once warmed up.  The other fluctuates – sometimes drastically - over the course of a lap and the plot is alway up and down.  Now it does somewhat track the RPM plot, but the swing in temperature over a lap can be 15 degrees!  And as the engine warms up, the greater the deviation becomes.

    So  has anyone else experienced this?  What could be the cause?  My first thought is thermostat or water pump.  But honestly there’s so many other things it that could be, I’d like to hear from others before I start digging around.

    #4770

    tony zambos
    Participant

    Eric,

    Before you start digging around, swap the water sensors and leads to the gauges to see if the problem moves with the swap. Make note of the path the leads take to the gauge.  Next, swap gauges between karts.

    #4787

    Eric Alexander
    Participant

    Thanks Tony.  On the list of things to do.

    And here’s a screenshot showing the temp.  Red is one engine and yellow is the other engine with the temp issue.  Its also dangerously close to too hot – 186 degrees.

    AiM Temp Data

    #4908

    Mike Maurini
    Participant

    I agree with Tony, first step is to change the sensor and lead. Secondly, make sure that the RPM wire and the water temp lead are not wound around one another or zip tied together. I have seen this happen before and it seems to be a result of the frequency. Sometimes it works fine, sometimes it is mind boggling. Since it changes with RPM, I will bet that is your problem.

    Thanks,

    MM

    #4914

    Eric Alexander
    Participant

    Great tip.  I’ll check that out.

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