Jim
Overall what it means is that your car is running pretty clean. Maybe even too
clean and too lean at idle. If those numbers are right you might want to make
your fuel mixture a tad richer because a too lean mixture can cause a burned
valve. There should be a CO% number on a plate on the left wheel arch. It's
the one with the static timing, etc. It should say something like 2% to 2 !/2%
CO at 950 RPM or some such info.
That means for optimum performance, economy, and emissions you want your exhaust
gas to test at 2-2 1/2 % carbon monoxide levels when the engine is idling at 95O
RPM. From what I could tell from your numbers (they get out of alignment by the
time they've gone through Cyberspace and might even be messed up, so take all of
this with a grain of salt) your car is putting out 0.47% CO at 950 RPMs which is
low which means it's running lean, which you don't want. The HC (hydrocarbon)
number for your car is 299 ppm (parts per million) which is low, but not too
low. I have a 69 engine also and my last emsisions test showed it putting out
about 400 ppm of HC (and that was after I leaned it up for the test). I run my
CO level at about 7.00 % CO in summer and 8-9 % CO in the winter but remember
I'm in Denver (5280 ft.and home of the World Champion Denver Broncos...sorry I
couldn't help it since Jim is both a Falcons and long suffering Vikings fan) and
the air is thinner so I generate more CO and HC than you do at sea level (Jim's
in Atlanta) because the combustion process is not as efficient as those of you
with that thick heavy air.
It seems strange looking at the numbers (and I'm wondering if they got turned
around) that at a higher RPM (2500) the HC went down and the CO went up....they
usually track together....both pollutants higher at lower RPMs (idling usually
produces higher emissions for all pollutants) and both pollutants lower at
higher RPMS.
The last thing...the CO + CO2 must be some sort of local or state standard...I
don't recognize it.
Hope this helps. If those numbers somehow got truncated then don't sweat the
too lean business cause 2.44% CO at 950 RPM is right on the mark in (runner-up)
Atlanta.
Bud
71TR6 CC57365
71TR6 CC65446
66TR4A CTC57806
____________________Reply Separator____________________
Subject: TR6 Emissions Test
Author: jaltman@altlaw.com
Date: 04/09/1999 4:02 PM
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My 69 is exempt from emissions testing, but I was curious about the
readings, so I paid the guy $10.00 to do it in training mode. No reports to
the state (BTW Georgia). It seems that had I been required to be tested I
would have passed, but I am not sure what some of the numbers mean. I
browsed through Bentley's looking for the CO numbers, but all its says is to
make them normal without ever telling what normal is. Anyway, here are the
results, comments desired.
2500 RPM 950 RPM
Reading Allowed Reading Allowed
HC-ppm 75 600 299 600
CO% 2.44 6.00 .47 6.00
CO+CO2% 15.7 6.00(min) 14.1 6.00(min)
Of other interest was that the database did not have TR6 as a 6 cylinder, it
insisted it was a 4 cyl.
So what should CO be and what do the others mean?
Jim Altman jaltman@altlaw.com Illigitimi non Carborundum
http://www.altlaw.com/metro/jaltman.html 69-TR6#CC28754L W4UCK
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