picknose lets end it

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On Sun, 20 Mar 2005 19:27:28 -0500, "pick one" <try again!> wrote:


Not coming to Hurc's defence, BUT a partially plugged exhaust CAN cause engine temp to go up. The reason the exhaust has lost 1000 degrees is because the water jackets and other engine parts have absorbed all the heat. However, once it gets plugged a bit worse, the engine does not get enough air-fuel mixture to produce enough heat (or power) to do much harm.
A previous responder mentioned something about 1996 and newer vehicles having temp sensors at both ends of the cat. This is not correct. The have O2 sensors at inlet and outlet - and if both sensors read the same the computer knows the cat is not functioning.
Also, someone mentioned the switching from rich to lean - and intimated that was required to allow the cat to work, because one part of the cat (oxidizing bed) required a rich mixture, and the other (reducing) required a lean mixture. This is also wrong.
The catalyst DOES require a relatively rich mixture to function - but the switching back and forth from rich to lean is due to the non-linear nature of the O2 sensor. It can NOT determine the actual oxygen content, but knows if it is too rich or too lean. It switches between rich and lean to get the proper average mixture. There are a few vehicles that use a linear O2 sensor, and the mixture on these vehicles does not fluctuate. The Civic VX was one good example.
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On Sun, 20 Mar 2005 23:14:28 GMT, 3 dog snipped-for-privacy@swatch.com wrote:

Well It might come across that way, seeing as I'm trying to talk down to your level.
Perhaps you can explain to me how an oxygen lean mixture (egr cycling) results in higher combustion temperatures. That could be the only thing that could explain your "interesting" perspective.
Call me a bit cynical but I'd be interested in any real citations from actual publications you could find to support your assertion
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wrote:

please tell me where i said that perhaps you can tell me what happens to hot exhaust gas that is restricted and stand a chance of beiing sucked up backwards lmfao a little is ok is a egr pintle the same size as 8 ehaust valves ??
tard
hurc ast

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wrote:

Better yet explain how that hot exhaust is being "sucked up backwards" it is the exhaust side of the pump remember? Better yet explain how that hot exhaust now well cooler than normal combustion temperatures will cause any damage being that normal combustion temperatures are at least in the 2000 + degree range. Better yet explain how a oxygen deprived gas fuel mixture will ignite with enough efficiency to make even half the normal combustion temperature?

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On Tue, 22 Mar 2005 00:19:34 GMT, 3 dog snipped-for-privacy@swatch.com wrote:

How would it be "sucked up backwards"? I know that there's valve overlap and all but....
WRT the hot exhaust gasses, they only needs not move forward to have an impact. is that simple enough for you?

nope
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