|  | Topic : O2 Sensor Bung |  |
| | | TarkMalbot | | Set |  |  | | Reg. Date | : | 07/09/2011 | | Posts | : | 143 | | Location | : | Carlisle, Cumbria, United Kingdom |
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| | Posted : 17 Dec 2012 - 11:36 Post title : O2 Sensor Bung | | | Now I am running a PCV with the O2 sensors turned off via Tune ECU rather than fitting the resistors supplied by Dynojet, can I remove the O2 sensors and wiring all together and fit blanking plugs in thwe down pipes?
And if so does anyone know where I can buy some from or of not what size and pitch thread so I need?
I am thinking something like this:
Link
Thanks,
Mark.
| Thunderbird 1700 Big Bore
Tors, IGT, De-Cat, Seat Hack & PCV
T Bars, Dart Screen, LongHaul & Back Rest/Rear Rack
| | Post edited by TarkMalbot on 17 Dec 2012 - 11:36 |
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| | | daz | | Zeus | |  | | Reg. Date | : | 12/05/2009 | | Posts | : | 7,709 | | Location | : | United States |
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| | Posted : 17 Dec 2012 - 15:14 Post title : Re: O2 Sensor Bung (Re: TarkMalbot) | | | I'm the guy you wanna talk to on this ! I'm sure someone will tell me it was my imagination, but i will tell you what i found. But more on that part in a minute. First of all, yes, you can and in fact should remove them according to what i've read. Sensors that go unused can go bad, and the reason being is that they are heated and if not used some sensors heating is turned off. If not heated they eventually get glogged. Probably i imagine that happens when cold before the exhaust naturally heats them. I have asked ad nausium to find out if ours are turned off when disabled, but no one seems to know. So to be safe i think it's a good idea to remove them considering the pair will cost you about $350. The connectorss you need to pull are a PITH to get too, so have a flashlight at the ready and prepare to be a contortionist.
Now for that other thing i mentioned. When i removed mine i found the proper bolt then i cut them down so thier length was just long enough to plug the hole buy NOT extend into the pipe to disrupt the flow. Even tho the sensors do just that i figured this would be less restriction and therefore be good. Surprisingly, and this is where no on will believe me, but the bike lost power and it was not at all subtle. I immediately figured it must be the plugs because the sensors had been disabled a while back and all of a sudden right after fitting plugs this happens. So i got 2 more bolts and this time i cut just enough off so they would be the same length as the sensors, then ground the threads off so they'd be smooth like the sensor as to not change the way the flow is. Power came right back. So heres what i think....the lesser restriction even tho it would seem to be minor was in fact enough to change things, and i believe it's not that you can't use short bolts to maximize flow, but that if you do you must do it BEFORE you tune the bike. In other words, i believe what i experienced was the same as opening up the exhaust in any other way....you must tune for the change. So it's up to you to do what you want but i'm just telling you this so you are aware. It's possible that depending on your tune, shortening them could do just the opposite for you. In fact, if i put short ones in mine as it is now with my bike tuned and modded much differently than it was then, i might experience just the opposite. In fact, thanks for bringing this up because i still have those short bolts and i think i will try it. (if the weather ever allows me to go for a ride )
Oh, and sorry, but i don't know the thread size. Bring a sensor with you and find one that looks right then try a nut that works on it and see if that nut works on the sensor. That how i did it.
| 2010 Blue/White Thunderbird, "Brutus". 1700 kit, short tors, gutted cat, UNI filter, filter seal off, custom tune. Brutus in his native habitat: Link
| | Post edited by daz on 17 Dec 2012 - 15:18 |
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| | | TarkMalbot | | Set | | | | Reg. Date | : | 07/09/2011 | | Posts | : | 143 | | Location | : | Carlisle, Cumbria, United Kingdom |
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| | Posted : 17 Dec 2012 - 16:54 Post title : Re: O2 Sensor Bung (Re: daz) | | | Ok Thanks for that information. Looks like it will be something else I can play with on the dyno when I do the seat hack.
Just in regards to the heating aspect; when you buy a PCV you are meant to unplug the sensors and fit a connector block with resistors in it so the sensors can have no way at all of gettign any power or heating.
| Thunderbird 1700 Big Bore
Tors, IGT, De-Cat, Seat Hack & PCV
T Bars, Dart Screen, LongHaul & Back Rest/Rear Rack
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| | | davetac1 | | Thunderbird | | | Reg. Date | : | 06/09/2010 | | Posts | : | 8,379 | | Location | : | Haverhill, Ma., United States |
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| | Posted : 17 Dec 2012 - 17:35 Post title : Re: O2 Sensor Bung (Re: TarkMalbot) | | | If I'm not mistaken,I believe that the 14mm spark plug thread is the same thread as used on O2 sensors.If so,there's your plug for the exhaust.Just break off the porcelin part of an old spark plug and the electrode at the bottom of it.
As a rule of thumb,if an O2 sensor has four wires comin out of it,then it's a heated sensor.If not,it's unheated.But ya can't see the wires on our scooters cause they're shielded.So I just went out to my shop and looked at the SM, and come to find out, the O2 sensors are HEATED UNITS. Dave!!!
| | Post edited by davetac1 on 17 Dec 2012 - 17:59 |
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| | | TarkMalbot | | Set | | | | Reg. Date | : | 07/09/2011 | | Posts | : | 143 | | Location | : | Carlisle, Cumbria, United Kingdom |
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| | Posted : 17 Dec 2012 - 17:49 Post title : Re: O2 Sensor Bung (Re: davetac1) | | | davetac1 wrote:
If I'm not mistaken,I believe that the 14mm spark plug thread is the same thread used on an O2 sensor.If so,there's your plug for the exhaust.Just break off the porcelin part of the spark plug.
If the sensor has four wires comin out of it,then it's a heated sensor.If not,it's unheated.I don't think the sensors used on our bikes are heated units as I don't remember seeing four wires comin from em,nor do I remember reading anything about heated sensors in the SM when I was doin alittle reading about em.
But then again,I'm not too bright either.  Dave!!! |
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I will look into it. A 14mm Spark plug has a 14 x 1.25mm thread which is the same as A motorbike sump plug or my car wheel bolts so will see if your right.
| Thunderbird 1700 Big Bore
Tors, IGT, De-Cat, Seat Hack & PCV
T Bars, Dart Screen, LongHaul & Back Rest/Rear Rack
| | Post edited by TarkMalbot on 17 Dec 2012 - 17:55 |
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| | | davetac1 | | Thunderbird | | | Reg. Date | : | 06/09/2010 | | Posts | : | 8,379 | | Location | : | Haverhill, Ma., United States |
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| | Posted : 17 Dec 2012 - 18:00 Post title : Re: O2 Sensor Bung (Re: TarkMalbot) | | | I just corrected my above post regarding the O2 sensors as they ARE HEATED. DUH!! Dave!!!
| | Post edited by davetac1 on 17 Dec 2012 - 18:02 |
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| | | TBRider | | Chaac | |  | | Reg. Date | : | 21/10/2011 | | Posts | : | 834 | | Location | : | Foothills, The Mountains, United States |
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| | Posted : 20 Dec 2012 - 22:18 Post title : Re: O2 Sensor Bung (Re: davetac1) | | | Is that before or after you shovem in?
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| | | davetac1 | | Thunderbird | | | Reg. Date | : | 06/09/2010 | | Posts | : | 8,379 | | Location | : | Haverhill, Ma., United States |
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| | Posted : 20 Dec 2012 - 23:19 Post title : Re: O2 Sensor Bung (Re: TBRider) | | |
TBRider wrote:
Is that before or after you shovem in? |
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YES!!  Dave!!!
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