Sourced: Probe style exhaust gas analyzer, Need it for AFM tuning |
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Sourced: Probe style exhaust gas analyzer, Need it for AFM tuning |
Van B |
Mar 8 2022, 09:48 AM
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#1
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Senior Member Group: Members Posts: 1,583 Joined: 20-October 21 From: Maryland Member No.: 26,011 Region Association: None |
Does anyone have an exhaust gas analyzer they would be willing to rent me for a reasonable fee?
I need to do some AFM checks and tuning and don't think installing a wideband sensor is feasible given the age and rustiness of my original exhaust. I'm afraid that things will get out of hand if I start grinding and cutting on the muffler to install a sensor bung. Bought and waiting to be used thanks to troth. |
troth |
Mar 8 2022, 01:00 PM
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#2
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Member Group: Members Posts: 151 Joined: 17-August 16 From: CT/WA Member No.: 20,305 Region Association: None |
I have a CO meter that I got for free. It’s a real POS piece of plastic junk. Doesn’t seem to like to hold calibration. I tried it on my car and it helped to get the tune close, but there was always doubt if I was spot on or not. If nobody steps up with a better deal you can have it for $10 to cover the cost of shipping.
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Van B |
Mar 8 2022, 01:10 PM
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#3
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Senior Member Group: Members Posts: 1,583 Joined: 20-October 21 From: Maryland Member No.: 26,011 Region Association: None |
Is it an old school style with the swing needle? I'm pretty sure those have to be calibrated before every use typically.
I was originally looking to buy a Heathkit CI-1080 but those have become expensive an rare novelty items it seems. As long as it works and its reasonably accurate, I'll gladly accept. The manual says CO should be between 2 and 3% lol... that's a pretty wide range compared to modern vehicles. Maybe someone else will respond with a different device and I'll have the luxury of doing a back to back comparison! Van |
StarBear |
Mar 8 2022, 02:22 PM
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#4
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Senior Member Group: Members Posts: 1,884 Joined: 2-September 09 From: NJ Member No.: 10,753 Region Association: North East States |
@Van B. How could one calibrate it? Wouldn’t some standard (bottle?) gas be needed? If it works I’d be interested in borrowing it. We could exchange at the July NE Gathering.
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infraredcalvin |
Mar 8 2022, 03:50 PM
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#5
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Distracted Member Group: Members Posts: 1,515 Joined: 25-August 08 From: Ladera Ranch, CA Member No.: 9,463 Region Association: Southern California |
You may want to try one of these, it allows you to use a wideband afr sensor without installing a bung.
https://www.innovatemotorsports.com/xcart/e...p-p-n-3728.html |
BillC |
Mar 8 2022, 04:15 PM
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#6
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Senior Member Group: Members Posts: 536 Joined: 24-April 15 From: Silver Spring, MD Member No.: 18,667 Region Association: MidAtlantic Region |
If you already have a wideband O2 sensor, you can "simulate" a probe-style sensor by taking a foot or so of 1" - 1.5" steel tubing, welding a bung onto it in the middle and then clamping the pipe to your exhaust outlet (stick as much inside the exhaust as you can).
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troth |
Mar 8 2022, 04:45 PM
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#7
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Member Group: Members Posts: 151 Joined: 17-August 16 From: CT/WA Member No.: 20,305 Region Association: None |
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Van B |
Mar 8 2022, 04:53 PM
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#8
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Senior Member Group: Members Posts: 1,583 Joined: 20-October 21 From: Maryland Member No.: 26,011 Region Association: None |
@Van B. How could one calibrate it? Wouldn’t some standard (bottle?) gas be needed? If it works I’d be interested in borrowing it. We could exchange at the July NE Gathering. After the elements warm up completely, you're supposed to balance the needle while both sides are exposed to air. Then the difference in cooling between the air side and exhaust side is shown as your CO level. These devices went out of fashion because this method really needs time to get a reading and for the engine to hold a static setting. |
Van B |
Mar 8 2022, 04:55 PM
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#9
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Senior Member Group: Members Posts: 1,583 Joined: 20-October 21 From: Maryland Member No.: 26,011 Region Association: None |
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Van B |
Mar 8 2022, 04:59 PM
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#10
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Senior Member Group: Members Posts: 1,583 Joined: 20-October 21 From: Maryland Member No.: 26,011 Region Association: None |
If you already have a wideband O2 sensor, you can "simulate" a probe-style sensor by taking a foot or so of 1" - 1.5" steel tubing, welding a bung onto it in the middle and then clamping the pipe to your exhaust outlet (stick as much inside the exhaust as you can). @infraredcalvin @BillC Thank you for the idea! I don't have an O2 sensor and the OE tail pipe is pretty small diameter. Too small for the depth of a Bosch sensor. But it's definitely an idea worth exploring in the long term. I'd rather have a new exhaust with a bunch installed though. Hopefully, I can get this car running to my satisfaction soon and then have time to spend on enhancements. |
BK911 |
Mar 8 2022, 05:00 PM
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#11
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Senior Member Group: Members Posts: 672 Joined: 19-February 04 From: Rocky Top, TN Member No.: 1,674 Region Association: None |
I have used a gunson on dozens of cars with repeatable results.
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StarBear |
Mar 8 2022, 07:46 PM
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#12
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Senior Member Group: Members Posts: 1,884 Joined: 2-September 09 From: NJ Member No.: 10,753 Region Association: North East States |
@Van B. How could one calibrate it? Wouldn’t some standard (bottle?) gas be needed? If it works I’d be interested in borrowing it. We could exchange at the July NE Gathering. After the elements warm up completely, you're supposed to balance the needle while both sides are exposed to air. Then the difference in cooling between the air side and exhaust side is shown as your CO level. These devices went out of fashion because this method really needs time to get a reading and for the engine to hold a static setting. Neat. We gots the time. |
Van B |
Mar 8 2022, 08:09 PM
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#13
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Senior Member Group: Members Posts: 1,583 Joined: 20-October 21 From: Maryland Member No.: 26,011 Region Association: None |
@Van B. How could one calibrate it? Wouldn’t some standard (bottle?) gas be needed? If it works I’d be interested in borrowing it. We could exchange at the July NE Gathering. After the elements warm up completely, you're supposed to balance the needle while both sides are exposed to air. Then the difference in cooling between the air side and exhaust side is shown as your CO level. These devices went out of fashion because this method really needs time to get a reading and for the engine to hold a static setting. Neat. We gots the time. This one operates nearly the same way as the Heathkit swing needle style but has a basic digital display and has air flowing over the reference element to help speed the analysis… still has to be calibrated every time it’s powered on, but I think it will be so cool to go through the same tuning process as folks did when these cars were new! |
targa72e |
Mar 8 2022, 11:10 PM
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#14
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Member Group: Members Posts: 262 Joined: 11-September 16 From: colorado Member No.: 20,392 Region Association: None |
My .02cents.
Get a good wide band 02 sensor and tune with that. Who cares what idle mixture is if wide open or part throttle is way lean or rich. Use wide band and drive around and tune for best compromise. john |
mgp4591 |
Mar 9 2022, 01:13 AM
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#15
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914 Guru Group: Members Posts: 5,372 Joined: 1-August 12 From: Salt Lake City Ut Member No.: 14,748 Region Association: Intermountain Region |
@Van B. How could one calibrate it? Wouldn’t some standard (bottle?) gas be needed? If it works I’d be interested in borrowing it. We could exchange at the July NE Gathering. We used a propane enrichment calibration for ours. The propane has a relatively constant level of HC so we'd dial into that, then stick it up the tailpipe and find out what the variable was. Pretty sure most of the early swing needle models were about the same. |
StarBear |
Mar 9 2022, 08:49 AM
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#16
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Senior Member Group: Members Posts: 1,884 Joined: 2-September 09 From: NJ Member No.: 10,753 Region Association: North East States |
My other option is to take it to my local garage with state emissions testing and a screwdriver for the CO adjustment screw. Not as much fun or learning, though. (IMG:style_emoticons/default/sad.gif)
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