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 Post subject: O2 Sensor Bungs?
 Post Posted: Mon Dec 12, 2011 10:19 am 
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I'm going to have O2 bungs put in all 8 header tubes so I can swap sensors around to see what's going on. I have a friend that made some for me that are longer than normal to keep the tip out of the exhaust flow but I'm wondering how much of that sensor, if any, needs to be out in the stream?

Having said that, I had thought about making the bung just long enough to put the tip of the sensor just barely into the tube. Question is, how much of it actually needs to be exposed to exhaust flow? I had even considered leaving the tip recessed some and just allowing exhaust flow to enter and exit from a 3/8" hole centered on the bung?

Any ideas or suggestions on this as for obvious reasons, I don't want too much of the sensor out in the exhaust stream? :-k

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 Post subject: Re: O2 Sensor Bungs?
 Post Posted: Mon Dec 12, 2011 12:51 pm 
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I'm currently running 8 probes with the bung made to exact length to place the tip exactly on the wall of the pipe. Its a open bung. The readings are fast with no ill effects.


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 Post subject: Re: O2 Sensor Bungs?
 Post Posted: Mon Dec 12, 2011 1:42 pm 
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How large is the hole in the pipe Bruce? :-k

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 Post subject: Re: O2 Sensor Bungs?
 Post Posted: Mon Dec 12, 2011 3:02 pm 
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Its a straight through socket nothing fancy. I have made sockets with a small hole in the end before and what they do is they slow down the reaction and sensitivity of the sensor. You get a nice smooth AFR line even though you dont use any filtering or smoothing as logworks calls it. It no good to tune by that.


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 Post subject: Re: O2 Sensor Bungs?
 Post Posted: Mon Dec 12, 2011 3:35 pm 
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shrinker wrote:
Its a straight through socket nothing fancy.


So that hole in the pipe needs to be the same as the tap drill for that 18 x 1.5 threaded bung then. Just make sure that the sensor isn't sticking in any further than the inner pipe wall? :-k

Contacted Greg Kelly today for a price on plugs for these. He sells the plug/bung kits but I only need the plugs so I'm hoping that I'll hear something from him soon. I've found out that I can use an oil drain plug from a Dodge but they're kinda expensive @ $9 each. The plug that Greg sells has a 10mm allen head to install it, which would make for a cleaner look.

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 Post subject: Re: O2 Sensor Bungs?
 Post Posted: Tue Dec 13, 2011 7:35 am 
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We machined a small spigot on the end of the bung so that it located correctly in the pipe. Yes its set so the end of the sensor is flush with the inner wall of the primary pipe. Ive just finished dynoing with the setup and its perfect.


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 Post subject: Re: O2 Sensor Bungs?
 Post Posted: Tue Dec 13, 2011 10:37 am 
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Ken0069 wrote:
The plug that Greg sells has a 10mm allen head to install it, which would make for a cleaner look.

I have some of those that use a 5/16 allen (same as 8mm). Let me know if you want these.

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 Post subject: Re: O2 Sensor Bungs?
 Post Posted: Wed Dec 14, 2011 8:18 pm 
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Ken

Spacing the O2 sensor out so that it's out of the air stream will improve the air flow, but will delay the response time of most O2 sensor a little bit. When I did back to back testing (Using RacePak stuff) changing the bung length changed the response about 30 milliseconds.

Doug

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