Exhaust Temperature

[Alex Birtwisle]

I was looking at the engine of my car today at work with a thermal

imaging camera - I noticed that the pipe carrying the exhaust gas from

cylinder #2 was about 2 degrees C cooler than the other three (will post

the images when if I get chance) Does anyone have any ideas why this may

be? Perhaps there is a lack of compression in that cylinder - or

the spark plug is dicky - or maybe the manifold is dissipating heat in a

non uniform way ....

 

 

Cheers

Alex

[Blatman]

2 degrees different at what tempquestion.gif

At 200C it would be a 1% deviation. I doubt that is anything to worry about.

[John Reay]

Got a thermal imaging camera in my tool box as well, everyone should have one tongue.gif

 

I wouldn't worry, exhaust gas temps can reach 600C, so if the exhaust isn't glowing you ain't driving it hard enough biggrin.gif

 

JOhn

[Tony Martyr]

Alex,

You are just seeing the manifestation of vaiable combustion that is an inherent part of any engine system. The fuel mass or combustion process can never be within a very close limit.

The standard method of adjusting tuning of large diesels is to use the individual cylinder exhaust temperature - while the theory is the same for automotive engines it is difficult to do.

[Bob Corb]

Most NA car engine are mapped to about 850°C exhaust temp at max power. A range of 20°C or so is acceptable. The differences are due to air flow mal-distribution usually due to the geometry of the inlet system.

 

Bob

[Nigel Riches]

To much technology, to much to worry about, just drive the thing.