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I purchased two clamp type EGT sensors for my Rotax 912ULS. I read in another post that it was suggested to put them on the back cylinders if using two. I have attached two pictures showing the approximate install locations with my configuration, and I was curious what your opinions were about the possible placement in the back. It appears that the front would be easier, but if its better to have them in the back that is where I will place them.

Please let me know if you have any input. It looks a little challenging to place them in the spots. I measured 100mm back per the Installation Manual and that is the approximate locations. The red dots in the pictures shows where that would be.

Thanks in advance,

Jim

 

9277_1_egt_Placement2.jpg (You do not have access to download this file.)
9277_1_EGT_Placement1.jpg (You do not have access to download this file.)
  • Re: Installation of EGT sensors on 912ULS

    by » 3 weeks ago


    Wow! That's one very tight set up

    I would think that having the EGT probe's between the exhaust springs, will make them vulnerable to damage when you/your mechanic have to do work on the exhaust /muffler. So I would be putting them in the front exhaust pipes.

    Be very careful with the final location/think ahead - Due to cowling restrictions/ pipe shape, I made oil filter replacement unnecessarily difficult.


  • Re: Installation of EGT sensors on 912ULS

    by » 3 weeks ago


    Here are images of the front exhaust pipes. As you can see.. lots of room.

    Another question - the diameter of the sensor is 5mm. What drill bit do I use? I can't seem to find a 5mm drill bit locally which is odd

    32900_2_IMG_20220617_192104595.jpg (You do not have access to download this file.)
    32900_2_IMG_20220617_192115211.jpg (You do not have access to download this file.)

  • Re: Installation of EGT sensors on 912ULS

    by » 3 weeks ago


    In Australia it is getting increasingly difficult to find imperial drill bits.

    I don't work well in imperial, the direct conversion from 5mm is  13/64 - should do the trick.

    When I did this job some years back, I very slightly countersunk the 5mm hole and used a smear of anti size on the probe to assist in good seating. I also used the anti size on the hose clamp worm drive, to facilitate later removal (the oil burns off but the nickle or copper remains)


  • Re: Installation of EGT sensors on 912ULS

    by » 3 weeks ago


    Actually, 8mm = (8*25.4) = 0.31496"
    13/64 = 0.203125
    5/16 = 0.3125
    21/64 = 0.328125

    So, 5/16 or 21/64 would work or be very close
    Wow that bachelors in Mathematics is really paying off now lol

     


  • Re: Installation of EGT sensors on 912ULS

    by » 3 weeks ago


    My apologies. Google (or my entry data) has lead me astray - As I said imperial (the Devil system) is almost a foreign language to me.


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