Happens all the time. You might be a little lean, but oddly enough too rich
and even just right will do it too. It's just tube headers--thin wall, hot
gas. You don't see it usually because you have lots of light, or you're
driving. Even cast headers glow on a dyno unless you've got big fans on
them. No big deal.
-----Original Message-----
From: owner-fot@autox.team.net [mailto:owner-fot@autox.team.net] On Behalf
Of Don Marshall
Sent: Monday, April 11, 2005 8:43 AM
To: 'riverside'; 'fot'
Subject: RE: red hot headers
Please respond to the whole list on this one. I had the same thing happen
the other day and figured it was too lean a mixture at low revs.
Now I'm curious.
Thx, Don TR4A
-----Original Message-----
From: owner-fot@autox.team.net [mailto:owner-fot@autox.team.net] On Behalf
Of riverside
Sent: Monday, April 11, 2005 1:19 PM
To: fot
Subject: red hot headers
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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