AeroElectric-List Digest Archive

Thu 09/20/18


Total Messages Posted: 1



Today's Message Index:
----------------------
 
     1. 05:04 PM - Re: Thermocouple Wire Connections (FLYaDIVE)
 
 
 


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    Time: 05:04:25 PM PST US
    From: FLYaDIVE <flyadive@gmail.com>
    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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