Home » Public Forums » GMCnet » [GMCnet] Re: Only one O2 sensor is required
| [GMCnet] Re: Only one O2 sensor is required [message #363908] |
Sun, 09 May 2021 13:56  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Then, the possibility exists that "bad stuff" might happen.
The ideal setup would be egt sensors in each and every exhaust port
connected to a computer that will record actual exhaust gas temperatures,
and do something like shut the engine down if a dangerous condition occurs.
It would have to be quicker than human reaction times to be effective.
By the time humans notice something wrong and take action, damage is
already occurring. When "sh## happens" it is on the timeline of
nanoseconds and seconds, not minutes.
Jim Hupy
Salem, Oregon
On Sun, May 9, 2021, 11:42 AM Jim Kanomata wrote:
> So Bob,
> the O2 reads one side, assuming the injectors on the other side is
> functioning correctly..
> What if it is not??
>
> On Sun, May 9, 2021 at 8:01 AM Bob Dunahugh wrote:
>
>> Remember. The left side of the carb or TB. Feed cylinder's 2, and 8 on
> the
>> right-side, and cylinders 1, and 7 on the left. The right side of the
> carb
>> or TB. Feed cylinders 4, and 6 on the right side, and 3,and 5 on the left
>> side. Thus. Only one O2 sensor is required.
>> Sorry. See what happens if I get started on engines, or Royales. GRIN.
>> Bob Dunahugh
>> 78 Royale since 2003
>> 4 Real COPO Yenkos
>>
>> GMC Motorhome Forum
>>
>> Visit GMC Motorhome Forum
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>
> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk@appliedairfilters.com
> http://www.gmcrvparts.com
> 1-800-752-7502
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| [GMCnet] Re: Only one O2 sensor is required [message #363912 is a reply to message #363908] |
Sun, 09 May 2021 14:23  |
stu@97381.com, Emery
Messages: 232
Registered: June 2020
Karma: 2
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Due to the crossover design of the intake manifold each injector feeds 2 cylinders on the left side and 2 cylinders on the right side. So the mixture reading by a sensor on the left side would be the same as the reading by a sensor on the right side. So, only one sensor would be needed as readings on both sides would be the same.
Emery Stora
77 Kingsley
Frederick CO
Emery
> On May 9, 2021, at 12:56 PM, James Hupy wrote:
>
> Then, the possibility exists that "bad stuff" might happen.
> The ideal setup would be egt sensors in each and every exhaust port
> connected to a computer that will record actual exhaust gas temperatures,
> and do something like shut the engine down if a dangerous condition occurs.
> It would have to be quicker than human reaction times to be effective.
> By the time humans notice something wrong and take action, damage is
> already occurring. When "sh## happens" it is on the timeline of
> nanoseconds and seconds, not minutes.
> Jim Hupy
> Salem, Oregon
>
>> On Sun, May 9, 2021, 11:42 AM Jim Kanomata wrote:
>>
>> So Bob,
>> the O2 reads one side, assuming the injectors on the other side is
>> functioning correctly..
>> What if it is not??
>>
>>> On Sun, May 9, 2021 at 8:01 AM Bob Dunahugh wrote:
>>>
>>> Remember. The left side of the carb or TB. Feed cylinder's 2, and 8 on
>> the
>>> right-side, and cylinders 1, and 7 on the left. The right side of the
>> carb
>>> or TB. Feed cylinders 4, and 6 on the right side, and 3,and 5 on the left
>>> side. Thus. Only one O2 sensor is required.
>>> Sorry. See what happens if I get started on engines, or Royales. GRIN.
>>> Bob Dunahugh
>>> 78 Royale since 2003
>>> 4 Real COPO Yenkos
>>>
>>> GMC Motorhome Forum
>>>
>>> Visit GMC Motorhome Forum
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>>
>>
>>
>> --
>> Jim Kanomata
>> Applied/GMC, Newark,CA
>> jimk@appliedairfilters.com
>> http://www.gmcrvparts.com
>> 1-800-752-7502
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| Re: [GMCnet] Re: Only one O2 sensor is required [message #363913 is a reply to message #363908] |
Sun, 09 May 2021 15:49 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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I have an EGT probe in the exhaust of each cylinder in my airplane so I can see and adjust the mixture under various conditions. The interesting thing is the leanest cylinder varies depending on power demand. Cylinder 3 is always the leanest under a full power climb. While at 70 tO 75% power cruise, cylinder 2 and 4 vary at being the leanest / hottest cylinder.
This gives more information that we really need.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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