fired up a fresh engine with tube headers last week and the
headers went to glowing red hot and 1000 deg F in about
2 minutes at 1500 rpm. shut it down. unfortunately, did not
have an air/fuel meter. last time i did a tractor motor with
cast iron ex manifold, we only got to about 650 and held there.
couple days later ran across an article saying that such a condition
is caused not by a lean mixture, but more likely cam timing or
rich mixture allowing the fire to still be going hard in the header,
don't recall ever getting a TR header that hot.
any comments from the engine guys in our group about the cause of
the glowing headers and hazards to continuous operation.
art de armond
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