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  1. #1
    skigolfnut's Avatar
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    Older exhaust manifold drilled and tapped the new way picture

    I tried the new way to drill an older exhaust manifold based on the pictures of the one one cut in half,
    I first went down with a 1/4" pilot hole all the way
    Then went down with the 15mm drill bit all the way
    Then I went with a 5/8" bit only about 3/4" of an inch,
    Ran the 18mm tap only down 3/4" of an inch,
    The oxy sensor fits perfect down past the threaded part and there is plenty of threads for the sensor to seat air tight,
    and a thicker wall on the bottom means less chance to hit the water jacket
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  2. #2
    Jonnan's Avatar
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    Nice work Do you think it would be possible to mill down the 'high' to get the sensor further in?

  3. #3
    Madzooki's Avatar
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    I wouldn't think that the sensor would read well there, since it isn't actually into the exhaust stream. For the sensor to do its job properly it really needs to have a good sample to read from.

    Paul

  4. #4
    A smart admits!A wicked excuses!An idiot insists! mitsakosgt's Avatar
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    Thats a good work done there dude. I still preffer the newer manifolds for AFR tap and also mill down will give better readings.
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  5. #5
    Jonnan's Avatar
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    Quote Originally Posted by mitsakosgt View Post
    Thats a good work done there dude. I still preffer the newer manifolds for AFR tap and also mill down will give better readings.
    Now that one I like. What radius mill did you use for that?

    Theres more room for error on the newer ones right? Other diffs?

  6. #6
    skigolfnut's Avatar
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    when I was using the 06 one that is cut in half now, the readings were always spot on, never an issue,
    The 08 and up manifolds are supposed to have a lot more room for error, I have not seen one cut in half yet to be sure were the water jacket is,
    They are so many older manifolds out there for cheap, that is why I was experimenting with my old one,
    Mainly so members could feel comfortable drilling and tapping there older style manifolds and not worry about hitting the water jacket,

  7. #7
    Matatan tocullo's Avatar
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    Quote Originally Posted by skigolfnut View Post
    when I was using the 06 one that is cut in half now, the readings were always spot on, never an issue,
    The 08 and up manifolds are supposed to have a lot more room for error, I have not seen one cut in half yet to be sure were the water jacket is,
    They are so many older manifolds out there for cheap, that is why I was experimenting with my old one,
    Mainly so members could feel comfortable drilling and tapping there older style manifolds and not worry about hitting the water jacket,
    Great job!

  8. #8
    Mod less, ride more! troyheb's Avatar
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    Quote Originally Posted by Madzooki View Post
    I wouldn't think that the sensor would read well there, since it isn't actually into the exhaust stream. For the sensor to do its job properly it really needs to have a good sample to read from.

    Paul
    It will read just fine like it is. You dont want them to extend down into the exhaust stream.


  9. #9
    Jonnan's Avatar
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    Quote Originally Posted by troyheb View Post
    Quote Originally Posted by Madzooki View Post
    I wouldn't think that the sensor would read well there, since it isn't actually into the exhaust stream. For the sensor to do its job properly it really needs to have a good sample to read from.

    Paul
    It will read just fine like it is. You dont want them to extend down into the exhaust stream.
    Ok. Less machining...
    Was planning on drilling it while still in the ski.

  10. #10
    Madzooki's Avatar
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    Quote Originally Posted by troyheb View Post
    Quote Originally Posted by Madzooki View Post
    I wouldn't think that the sensor would read well there, since it isn't actually into the exhaust stream. For the sensor to do its job properly it really needs to have a good sample to read from.

    Paul
    It will read just fine like it is. You dont want them to extend down into the exhaust stream.
    Why wouldn't you want it in the exhaust stream? With the sensor that far up into the hole it would seem that you would be getting a stagnated sample to read from, because the turnover rate inside that cavity will be longer than if it were exposed. We're talking micrseconds, but still I would think it would skew reading to some extent. Not trying to argue, just trying to gain a little perspective here. Every automotive O2 or A/F sensor extends into the exhaust stream. I see no reason why it shouldn't do the same in a PWC as well. There should not be any water that far into the exhaust and if there was you would have bigger problems then your A/F gauge not reading correctly.

    Paul

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