Going to make wideband A/F sensor adapter plate for exhaust - need quick answer
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Going to make wideband A/F sensor adapter plate for exhaust - need quick answer

  1. #1
    Off Road Badass Bonzen's Avatar
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    Default Going to make wideband A/F sensor adapter plate for exhaust - need quick answer

    So I have access to a 3 axis CNC at my work and I am going to have a 1" thick aluminum spacer made so I can plug in my Innovate Motorsports wide-band O2 and get some real A/F readings to help tune my boat. It's a jet boat and runs wet logs, so obviously i have to keep the sensor dry. However my question is, when i unbolted the snail off the manifold, I noticed the gasket has water jacket slots on the snail side, but not on the manifold side. Are they blocked off on the manifold side for a reason? Because if there is no allowed water flow from the snail to the manifold, then why does the snail even need the gasket with the water jacket cutouts? Seems like they should just both run the block off gasket. Does this make sense or am i missing something here? Reason I'm asking is i need to know if I have to machine the water jacket slots in the spacer or of i can just leave it solid. See pics...thanks!
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    "I'd love to help you out wags, but there is larger issue concerning breast cup sizes on another thread that we have to work thru first. This subject suddenly became a non issue." - GN7
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  3. #2
    Senior Member DuaneHTP's Avatar
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    it would help to see a picture of your complete engine so we can see how your water and manifolds are hooked up.
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    Or Seth, either one Budweiser's Avatar
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    Could do it either way. However, I'd strongly consider machining them on the three sides that wont have the sensor. Just thinking a little more surface area for water to contact wouldn't be a bad thing. Don't think it's mandatory though. Certainly not for any plumbing/water flow concerns. I hope the sensor stays dry there. Let us know how it goes.
    Last edited by Budweiser; 04-22-2016 at 08:10 PM.
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    Senior Member kurtis500's Avatar
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    Have you run these before in the exhaust? Just an FYI, I ran the Holley MPFI system for 5 years and had nothing but trouble with the O2 sensor getting knocked out by steam/water etc. I went though about 1 sensor per summer. I moved it around even had it mounted at the very front of the manifold closest to the cylinder farthest from the water discharge. This setup is with manifolds and the snail.

    My advice is to carry a spare sensor, when my O2 sensor went down it sent the motor into a overly rich setting and I had to get towed. I eventualy took it off last year and sold the whole system and cant be happier. If you just doing it for O2 readings, Id still bring a spare.

    just my .02 after much anger and frustration
    Last edited by kurtis500; 04-23-2016 at 08:04 AM.
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    Off Road Badass Bonzen's Avatar
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    Best two pics of the motor I have. Water tee's off from the jet pump goes into the rear of the manifolds on both sides, then out the top of the manifolds onto the front of the block, then out the thermostat housing (no t-stat) and into the snails, then out the back of the snails into the exhaust pipes.

    The O2 is strictly for reading the AF rage. It will have no effect on the motor and how it runs, just how my tuner will alter the fuel tables depending on what the gauge reads. I know its running mega rich as is but want to know at what RPM's and KPA ranges we can safely lean it out.
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    "I'd love to help you out wags, but there is larger issue concerning breast cup sizes on another thread that we have to work thru first. This subject suddenly became a non issue." - GN7
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    Senior Member DuaneHTP's Avatar
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    In answer to your original question; ", then why does the snail even need the gasket with the water jacket cutouts?" In your application, it does not need the cut out.

    As far as to sensor operating efficiency and longevity, I'll leave that to the others.
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    Off Road Badass Bonzen's Avatar
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    Quote Originally Posted by DuaneHTP View Post
    In answer to your original question; ", then why does the snail even need the gasket with the water jacket cutouts?" In your application, it does not need the cut out.

    As far as to sensor operating efficiency and longevity, I'll leave that to the others.
    So basically someone just used that particular gasket but didn't need to. Ok cool thanks makes it an easier machining operation and I can just buy 4 of the non-jacketed gaskets.
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  10. #8
    Off Road Badass Bonzen's Avatar
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    Got the adapter plate machined over the weekend. Just need to drill and tap the hole for the sensor.
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    "I'd love to help you out wags, but there is larger issue concerning breast cup sizes on another thread that we have to work thru first. This subject suddenly became a non issue." - GN7
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  11. #9
    Senior Member DuaneHTP's Avatar
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    Looks Good!
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  12. #10
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    Nice
    If For Some Reason I Do Something Worthy Of Recognition. God Provided The Ability And Deserves The Credit.


    QE 439 Twin Turbo
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  13. #11
    Off Road Badass Bonzen's Avatar
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    Got the machining finished up and the spacer installed. Also got the gauge mounted in the dash and all the wiring ran and the sensor hooked up but didn't get pics. Going to hit the lake Wednesday and see what AFR readings I'm getting.
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    "I'd love to help you out wags, but there is larger issue concerning breast cup sizes on another thread that we have to work thru first. This subject suddenly became a non issue." - GN7
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  14. #12
    Or Seth, either one Budweiser's Avatar
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    Superb. Nice job.

    Keep us posted.
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  15. #13
    Off Road Badass Bonzen's Avatar
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    Sensor installed.
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    "I'd love to help you out wags, but there is larger issue concerning breast cup sizes on another thread that we have to work thru first. This subject suddenly became a non issue." - GN7
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