List,
I was helping a friend tune-up his TR6 today and we got dry compression
readings of 120, 122, 120, 118, 115, 130 for cylinders 1-6. It ran fine
(decent pull through all gears) but we couldn't get the CO to come close to
passing emissions (need < 4%). It was reading over 19% on the CO monitor. No
amount of adjusting the fuel mixture and/or timing would get it any lower.
The head, intake manifold, and carbs were put on this engine from a parts car
engine that was getting 2.2 % on the very same CO monitor. The reason for
the switcheroo was the "new" car was a better candidate for fixing up than the
"old" car that could pass emissions.
Do the compression readings and the high CO readings indicate the rings are
shot? Could blow-by be causing the emissions to be so high that any fuel
mixture/timing adjustments are just lost in the noise?
We didn't have time to do a wet compression test or read the plugs again...got
too cold and dark. How much of an increase in compression with a wet
compression test would indicate that it's the rings? Readings around 145-155?
If not rings then what else might it be?
Thanks in advance for any suggestions/opinions/wags.
Bud Rolofson
71TR6 CC57365 (Good 6)
66TR4A CTC57806 (The Wreck-Almost Parts)
66TR4A CTC57529 (The Project)
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