When California was trying to reduce NOx emissions back in the 70's, the
approved kit contained a vacuum cap to disable the distributor vacuum
advance, idle timing of about 6 degrees ATDC, and a warning decal for the
speedometer that read something like "Prolonged speeds above 50 MPH may
result in engine overheating and severe engine damage". Also, the factory
setting for a 78/79 1500 Midget engine is 2 degrees ATDC, and a common
complaint is engine overheating. In these two examples, is the additional
heat a result of more complete combustion although occurring at a time in
the cycle when the heat is wasted? Or is it the unburned fuel burning in
the exhaust system? Not that it matters, just curious of course.
David Riker
74 Midget
63 Falcon
70 Torino
http://personalweb.sunset.net/~davidr
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