Glowing Manifolds and Turbos
13-02-2007, 03:29 PM
#41
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Originally Posted by Chip-3Door
Originally Posted by BatFink
Originally Posted by Chip-3Door
Could have been an interesting debate this on what circumstances you actually see excessive temps, like when people go for too high a compression ratio and end up with too much retard, or when you end up with a glowing turbo whilst at part throttle low boost if it runs too lean.
He might be young, but im sure he was aware there was heat involved, wouldnt it be more useful to tell him WHY there is so much heat there?
(and no answers of, cause you just burnt petrol and things get hot when they burn
)
He might be young, but im sure he was aware there was heat involved, wouldnt it be more useful to tell him WHY there is so much heat there?
(and no answers of, cause you just burnt petrol and things get hot when they burn
)
I was more asking why a turbo engine produces more heat in that area.
Plus what to do to cool it and what sorta heat you'd expect on modded cars.
The reason that you get this more with a turbo car, is there is a bigger mass of exhaust gas present in the exhaust manifold at any point in time than in a N/A car with an identical diameter of pipework, so essentially more exhaust gas hangs around at once, and hence gives up more heat
Ie, its not always the case that the gas itself is actually hotter, merely that 800 degrees in both cases would result in a greater rise in temp in the turbo manifold, due to the restriction of the turbo leading to a lot more exhaust gas present in there at once (if you put a map sensor in both manifolds, you would see a far greater pressure in the turbo one)
I thought as much but wasn't 100%. 
14-02-2007, 12:04 PM
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Originally Posted by Porkie
Originally Posted by BatFink
Half asleep atm
she soon woke up...
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