Any smog gurus out there? Please, no guessing on the following.
I need to know what really happens :-)
What is the effect on unburned hydrocarbon emissions (HC)
if the timing is retarded?
Later (68+) cars were set a 0 degrees, making for poor performance
but cleaner emissions. I had thought this dropped NOx, but some
reading I was doing this weekend implies that retarding the timing will
drop HC.
So what happens at the smog machine if I back off from 16 degrees
to say 4 degrees? Does the tailpipe clean up for the test?
(for the astute: No, CA is not back to testing our cars)
-- John
John F Sandhoff sandhoff@csus.edu Sacramento, CA
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