Unburned fuel in the exhaust will cause the exhaust to glow even without
AIR. Retarded timing or crossed plug wires will leave unburned fuel in
the exhaust. jeffcoslacker and his pyrometer are also accurate as far
as combustion temp and fuel ratio. What you have is a fire inside the
exhaust. AIR will make the exhaust even hotter becuase of fresh O2
supplied to the unburned fuel in the exhaust. After all, that is
exactly what AIR is designed to accomplish.


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JustSayGo
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