[DeTomaso] Techno Question: Bung placement on headers for A/F sensor

[John Donahue]

Been following this dialog, but it guess I need a little education on what exhaust reversion is. 
Jack
4348

> On Aug 17, 2014, at 9:38 PM, Dave Londry <davel at emspace.com> wrote:
> 
> Sorry - that was unclear Chuck.
> The farther the sensor is from the exhaust outlets, the lower the low-rpm limit at which you can read A/F.
> 
> The lower the rpm, the farther the exhaust reversions travel back up the pipes.
> (More time to travel and less opposing gas velocity)
> dave
> 
>> On 17/08/2014 6:55 PM, Charles Engles wrote:
>> Dear Dave,
>> 
>> 
>>           So to rephrase what you said (which is very interesting), the
>> further down the exhaust the better the sensor reads and reads at lower
>> rpms.   Therefore, the best point is as far back as possible, i.e. just
>> before the muffler?
>> 
>>          I have read that the Innovate is supposed to be the fastest
>> sampling or testing unit.  Does that have any bearing on your recommendation
>> for a bung further down the exhaust pipe to obtain better readings?
>> 
>> 
>>                           Warmest regards,  Chuck Engles
>> 
>> 
>> 
>> -----Original Message-----
>> From: DeTomaso [mailto:detomaso-bounces at poca.com] On Behalf Of doug351c
>> Sent: Sunday, August 17, 2014 3:17 PM
>> To: Dave Londry; detomaso at poca.com
>> Subject: Re: [DeTomaso] Techno Question: Bung placement on headers for A/F
>> sensor
>> 
>> Dave,
>> 
>> By "outlet" do you mean header collector flange?
>> 
>> Doug Braun
>> blue 73L #5505
>> 
>> -----Original Message-----
>> From: DeTomaso [mailto:detomaso-bounces at poca.com]On Behalf Of Dave Londry
>> Sent: Sunday, August 17, 2014 1:05 PM
>> To: detomaso at poca.com
>> Subject: Re: [DeTomaso] Techno Question: Bung placement on headers for A/F
>> sensor
>> 
>> 
>> That is good stuff Chuck and giving all that info first priority,
>>   the farther you are from the outlet - the lower the rpm at which you'll
>> get stable A/F readings.
>> The reversions in our short exhaust systems are really fierce.
>> Below about 1700 rpm I get nothing but crap.
>> dave
>> 
>> 
>>> On 17/08/2014 12:03 PM, Charles Engles wrote:
>>>     Dear SOBill, Jerry, Asa and Mike
>>> 
>>> 
>>> 
>>>                         Great minds think alike and experience makes the
>>>     optimal location so much easier to pinpoint.   Thanks!
>>> 
>>> 
>>> 
>>>                                         Warmest regards,  Chuck Engles
>>> 
>>> 
>>>     From: SOBill at aol.com [mailto:SOBill at aol.com]
>>>     Sent: Sunday, August 17, 2014 12:02 PM
>>>     To: cengles at cox.net; detomaso at poca.com
>>>     Subject: Re: [DeTomaso] Techno Question: Bung placement on headers for
>>>     A/F sensor
>>> 
>>> 
>>>     Chuck,
>>> 
>>> 
>>>     The bung should be mounted at the 12 o'clock position so condensation
>>>     does get to the sensor on startup.
>>> 
>>> 
>>>     I welded mine on the exhaust pipe just after the collector because my
>>>     engine was in the car and I could easily remove the exhaust pipe to do
>>>     the welding.
>>> 
>>> 
>>>     SOBill
>>> 
>>> 
>>>     The main thing is to keep the main thing the main thing.
>>>     Do the best you can with what your have where you are.
>>>     Have fun today!
>>>     SOBill
>>> 
>>> 
>>>     In a message dated 8/17/2014 8:57:41 A.M. Pacific Daylight Time,
>>>     [1]cengles at cox.net writes:
>>> 
>>>       Dear Forum,
>>>                           I will soon have both engines out of both
>>>       Panteras for
>>>       work.  It dawned on me that this would be a good time to add a bung
>>>       on the
>>>       headers for use with and A/F meter sensor.    I have an email sent
>>>       to
>>>       Innovate for their recommendations, but it is the weekend.    I
>>>       assume that
>>>       the bung should be welded into the end of the header collector.
>>>                           Does anyone have knowledge of the optimal spot
>>>       to put
>>>       the bung?
>>>                                                    Warmest regards, Chuck
>>>       Engles
>>>          Dear Forum,
>>>                              I will soon have both engines out of both
>>>       Panteras
>>>          for work.  It dawned on me that this would be a good time to add
>>>       a bung
>>>          on the headers for use with and A/F meter sensor.    I have an
>>>       email
>>>          sent to Innovate for their recommendations, but it is the
>>>       weekend.    I
>>>          assume that the bung should be welded into the end of the header
>>>          collector.
>>>                              Does anyone have knowledge of the optimal
>>>       spot to
>>>          put the bung?
>>>                                                       Warmest regards,
>>>       Chuck
>>>          Engles
>>>       _______________________________________________
>>>       Detomaso Forum Managed by POCA
>>>       DeTomaso mailing list
>>>       [2]DeTomaso at poca.com
>>>       [3]http://poca.com/mailman/listinfo/detomaso_poca.com
>>> 
>>> References
>>> 
>>>     1. mailto:cengles at cox.net
>>>     2. mailto:DeTomaso at poca.com
>>>     3. http://poca.com/mailman/listinfo/detomaso_poca.com
>>> 
>>> 
>>> 
>>> _______________________________________________
>>> 
>>> Detomaso Forum Managed by POCA
>>> 
>>> DeTomaso mailing list
>>> DeTomaso at poca.com
>>> http://poca.com/mailman/listinfo/detomaso_poca.com
>> 
>> 
>> _______________________________________________
>> 
>> Detomaso Forum Managed by POCA
>> 
>> DeTomaso mailing list
>> DeTomaso at poca.com
>> http://poca.com/mailman/listinfo/detomaso_poca.com
>> 
>> 
>> 
> 
> 
> _______________________________________________
> 
> Detomaso Forum Managed by POCA
> 
> DeTomaso mailing list
> DeTomaso at poca.com
> http://poca.com/mailman/listinfo/detomaso_poca.com