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 Glowing red exhaust manifold

 Created by: webucile
Orig. Posting Date User Name Edit Date
Dec 2, 2020 07:16PM h_lankford  
Dec 2, 2020 05:47AM kenatminimania  
Dec 2, 2020 04:44AM Dan Moffet  
Dec 1, 2020 10:10PM webucile Edited: May 23, 2021 09:32PM 
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 Posted: Dec 2, 2020 07:16PM
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plugged up cat?

 Posted: Dec 2, 2020 05:47AM
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Quote:
Originally Posted by webucile
Hi all.
Got a r53 mini in.
It has got kav 20% pulley on it.
Whilst running up to get heater hot holding the revs at 3500 the exhaust manifold was glowing red.
My question is being new to minis is.
Is this normal ?
 

 

 

No, this is not normal. We experienced this when the engine was running way too lean.

There might be an intake leak - extra air going into the intake. Or the ECU software needs to be modified to correct the air/fuel mapping.

20% is a mighty small supercharger pulley...

 Posted: Dec 2, 2020 04:44AM
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CA
I doubt it is "normal" for the exhaust to get that hot under those conditions, but it may be operator-induced.

Holding an engine at 3500rpm to warm the heater with no load on the engine might have screwed up the computer analysis of what the engine was doing - with the engine spinning free and no work for it to do, the computer may have run it excessively lean or rich or gave it un-natural spark advance, which would generate the hot exhaust manifold.

The "proper" way to warm an engine is to let it idle until it comes up to temperature. Assuming the thermostat is functioning, it should stay closed until the engine reaches operating temperature, at which there would be hot fluid to warm the heater. The other way is to drive it gently or moderately  (as it would say in the owner's manual) until the engine reaches operating temperature. The thermostat modulates engine temperature and will actually close partially or fully to keep the engine at its optimum operating temperature.

.

"Hang on a minute lads....I've got a great idea."

 Posted: Dec 1, 2020 10:10PM
 Edited:  May 23, 2021 09:32PM
Total posts: 1
Last post: Dec 1, 2020
Member since:Dec 1, 2020
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Hi all.
Got a r53 mini in.
It has got kav 20% pulley on it.
Whilst running up to get heater hot holding the revs at 3500 the exhaust manifold was glowing red.
My question is being new to minis is.
Is this normal ?

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