Exhaust manifolds 100° difference
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Senior User
Joined: Oct 2015
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From: Bismarck, ND
Exhaust manifolds 100° difference
Has anyone ran into this issue on their FE? My passenger runs about 470° at idle operating temperature and driver side runs around 350°, from what my grandfather says is its possibly a "partially" internally collapsed manifold, he's ran into that issue before. So am I looking at another excuse for headers or another issue? All exhaust port temperatures are similar to the manifold temperature.
Note that no matter where I measured the temperature it was always a 100° difference (give or take 15°)
Note that no matter where I measured the temperature it was always a 100° difference (give or take 15°)
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
Has anyone ran into this issue on their FE? My passenger runs about 470° at idle operating temperature and driver side runs around 350°, from what my grandfather says is its possibly a "partially" internally collapsed manifold, he's ran into that issue before. So am I looking at another excuse for headers or another issue? All exhaust port temperatures are similar to the manifold temperature.
Note that no matter where I measured the temperature it was always a 100° difference (give or take 15°)
Note that no matter where I measured the temperature it was always a 100° difference (give or take 15°)
Collapsed manifold? I've got a bridge to sell him...... what about a raccoon?
Post Fiend
Joined: Jun 2003
Posts: 8,209
Likes: 12
From: Black Hills of SD
Maybe the heat flapper butterfly (EFE for you techys) is stuck shut. That would mean most of the exhaust from one side is going up under the carb through the cross over to the other side.
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
So the left bank is running a bit leaner then the right bank(at idle). I doubt the manifold has anything to do with it. Trying resetting the idle mixture screws on the carb.
Try holding the rpm up to like 1500 rpm and see if the temps balance out.
Try holding the rpm up to like 1500 rpm and see if the temps balance out.
Fleet Mechanic
Joined: May 2001
Posts: 1,396
Likes: 4
From: Cupertino
Have you checked for lean on one side? Like an intake manifold gasket sucking wind?
Do a vacuum check and compare plugs from right to left bank.
Manifolds do not collapse. Gaskets do, and mixtures from right to left change temperatures.
Another cheap diagnostic would be to have a smog shop compare hydrocarbons on each bank, if you have dual exhausts. And access to a smog shop.
Do a vacuum check and compare plugs from right to left bank.
Manifolds do not collapse. Gaskets do, and mixtures from right to left change temperatures.
Another cheap diagnostic would be to have a smog shop compare hydrocarbons on each bank, if you have dual exhausts. And access to a smog shop.
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Laughing Gas
Joined: Mar 2013
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From: Garner NC
Just to be clear, while it is true that the two barrels of the carb only service 4 cylinders each, they cross in the intake (dual plane) so each barrel services two cylinders on each side. I don't think adjusting the lean/rich of the idle mixture screws will change your heat issue. If you do have the flapper valve after one of the exhaust manifolds I would test it to see that it does in fact move freely.
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Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
Has anyone ran into this issue on their FE? My passenger runs about 470° at idle operating temperature and driver side runs around 350°, from what my grandfather says is its possibly a "partially" internally collapsed manifold, he's ran into that issue before. So am I looking at another excuse for headers or another issue? All exhaust port temperatures are similar to the manifold temperature.
Note that no matter where I measured the temperature it was always a 100° difference (give or take 15°)
Note that no matter where I measured the temperature it was always a 100° difference (give or take 15°)
Thread Starter
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Senior User
Joined: Oct 2015
Posts: 445
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From: Bismarck, ND
My carb was boiling over and pressure was really building up in the line, noticed no ( forget the term but the exhaust circulating in intake to heat the carb/fuel) so led me to think of a restriction in the exhaust/manifold
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
On the different temp exhaust manifold, my 1st reaction was plugged,smashed, or kinked R/S exhaust pipe or muffler if you have duals. Did you run over something in the road recently?
Post Fiend
Joined: Jun 2003
Posts: 8,209
Likes: 12
From: Black Hills of SD
The flapper isn't exactly part of the manifold, it's sandwiched between the manifold and header pipe.