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1. 05:04 PM - Re: Thermocouple Wire Connections (FLYaDIVE)
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Subject: | Re: Thermocouple Wire Connections |
B. Borger:
Thank you for the explanation.
And sorry it took so long to respond. Your email was sent to the Spam
Folder.
Barry
On Fri, Sep 14, 2018 at 9:11 AM Robert Borger <rlborger@mac.com> wrote:
>
> Barry,
>
> The Rotax 9xx series of engines have liquid cooled heads and air cooled
> cylinders. The CHT sensors are placed on what should be the extremes of
> CHT. #1 should be the coolest CHT and #4 should be the warmest CHT. #2
&
> #3 should be somewhere in between. Rotax also has a separate coolant
> temperature sensor on the output of the manifold where the 4 returns from
> the cylinder head combine.
>
> I don=99t think that CHT is used as a diagnostic in trouble shootin
g. It is
> a warning of serious problems in the cylinder like detonation or
> preignition. If one sees a rapidly increasing, out of limit, CHT, it
=99s
> time to reduce the throttle and find a place to land.
>
> Blue skies & tailwinds,
> Bob Borger
> Europa XS Tri, Rotax 914, Airmaster C/S Prop (130 hrs).
> Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP, Hercules
> Prop.
> 3705 Lynchburg Dr.
> Corinth, TX 76208-5331
> Cel: 817-992-1117
> rlborger@mac.com
>
> On Sep 14, 2018, at 7:32 AM, FLYaDIVE <flyadive@gmail.com> wrote:
>
> Bob Borger & Werner,
>
> I=99m theorizing once again. Since ROTAX has only two bosses for C
HT
> sensors and they are diagonally opposit each other and the engine is wate
r
> cooled the sensors must be averaging or at least =98mellowing
=99 the readings.
> It is more like a car which has only one temperature gauge.
>
> Question: Has anyone used a CHT reading to diagnose and pin point a
> particular cylinder problem? Of course since there are only two cylinder
s
> with probes the problem would have to be on those cylinders. Unless...
> There is such an increase in temperature that, it defines a problem.
>
> Barry
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