Red hot manifold

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Model T Ford Forum: Forum 2012: Red hot manifold
Top of pagePrevious messageNext messageBottom of page Link to this message  By John Markham on Wednesday, August 08, 2012 - 08:38 pm:

Just got home from a show with the T, getting dusk and when I pulled into the garage it was dark, I lifted the hood and the exhaust manifold was red, the moto meter did not show that is was overheating at all, is this normal?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dan Treace, North FL on Wednesday, August 08, 2012 - 08:58 pm:

Yep. Must have been running at good speed prior to pulling into the garage. Typical reason why so many manifolds are warped over time.

Really red hot all over, not just at the rear exhaust port, means perhaps the ignition was retarded a bit too much, or perhaps the carb was really leaned out too much, that will heat up the exhaust manifold too.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Royce in Dallas TX on Wednesday, August 08, 2012 - 09:13 pm:

If you put the spark lever all the way up and run the car at idle for a minute or two it will cause the exhaust manifold to turn red from the unburned fuel that is re - ignited in the hot manifold. You won't see it in daylight.

Best bet, if the T is done for the day turn it off. Don't run it for long at idle, especially with the spark retarded to the start position.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Matthew David Maiers on Thursday, August 09, 2012 - 12:37 am:

i was always told by an old time model Ter that when you had it running just right the manifold would glow dark cherry red at night.

it always makes me smile when at night pulling a hill i can just see the manifold glow through the firewall.


Top of pagePrevious messageNext messageBottom of page Link to this message  By A. J. "Art" Bell on Thursday, August 09, 2012 - 01:37 pm:

Red hot manifold means red hot valves as well. I was always under the
impression that engines should be idled for a minute or two before you
shut them off to keep any exhaust valve that stopped clear of the valve
seat from warping as it cooled. Higher compression engines would often
‘run on’ or ‘diesel’ if this was not done, and idle kickers or solenoids were
used to close the throttle valve completely to prevent this when the ignition
was turned off. I still idle any of my engines before shutting down after a
hard run, even though fuel injection and/or computer engine management
keeps them from any ‘after run’.
Have I been misled or wrong all this time???


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dennis Halpin on Thursday, August 09, 2012 - 01:56 pm:

Could be running a little lean too.


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