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  1. #1
    Moderator beerdart's Avatar
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    EGT Probe Install

    Anyone have any pics of probes installed?

    Where is the best place to drill without hitting the water jacket?

    It looks like there is enough meat at the flange closest to the cylinder?
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  2. #2
    beachbum0286's Avatar
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    Quote Originally Posted by beerdart View Post
    Anyone have any pics of probes installed?

    Where is the best place to drill without hitting the water jacket?

    It looks like there is enough meat at the flange closest to the cylinder?
    Best place to drill and tap is shown in the pics. It is right next to the 90 degree water fitting near the J pipe coupling. I believe I used a 21/32 drill bit and I know an M18x1.5 tap. That is the tap that works for the LM-1 O2 sensor.
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  3. #3
    BLACK MAGIC HEADERS hydrojunkie's Avatar
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    Jerry should have as he has them for his conversion

  4. #4

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    1/2 in. from the block above the ports. Yes I screw it up b4

  5. #5
    For those of you who are set up to check afr's...I had a plug drilled and tapped that goes into the same bung that the O2 sensor uses. I have a probe inserted there to check exhaust gas temp's. I'm sure the temps are a bit cooler there than directly at the manifold, but I'm more concerned with the deviation in the temp's. I can spot a cooling, or possibly fueling, problem using this method. I have found that the temps are very consistent. In the Summer I run from 315 degrees C at idle to 550 C in the mid and around 750 C up top. That's close to 1400 F up top. My digital gauge reads in degrees C. I was told that around 1200 F at wot is normal. My afr's are just below 12 and the end bell on my exhaust manifold is looks like new...no deterioration. If you already have a bung for an O2 sensor, the dynotune gauge is around $160. The EGT probe and a fuel pressure gauge, for those running a rrfpr, helps you to monitor your motor better. Looking at the gauges also gives you something to do when you're on those long cruises.

    Mark

  6. #6
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    Quote Originally Posted by beachbum0286 View Post
    Best place to drill and tap is shown in the pics. It is right next to the 90 degree water fitting near the J pipe coupling. I believe I used a 21/32 drill bit and I know an M18x1.5 tap. That is the tap that works for the LM-1 O2 sensor.
    Beerdart is talking about EGT probes... one per cylinder... not a place for an 02 sensor.

    Where you have the circles will be the only place without hitting a water jacket... right in the middle of the flange

    Do your EGT's require a 1/16" NPT thread

  7. #7
    ROTAX RACING performance
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    EGT probe location
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  8. #8
    Moderator beerdart's Avatar
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    Quote Originally Posted by bigdaddyRXP View Post
    Beerdart is talking about EGT probes... one per cylinder... not a place for an 02 sensor.

    Where you have the circles will be the only place without hitting a water jacket... right in the middle of the flange

    Do your EGT's require a 1/16" NPT thread
    I can do 1/16 or 1/8 NPT the probes are 1/16 dia.

    Quote Originally Posted by mrracing View Post
    EGT probe location
    Malte hard to make out the pic is that the top or bottom of the manifold??

  9. #9
    ROTAX RACING performance
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    it at the top

  10. #10
    ROTAX RACING performance
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    better picture of the EGT location
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