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Re: Yup. Posted by Justin VanAbrahams [Email] (#32) [Profile/Gallery] (more from Justin VanAbrahams) on Mon, 10 Sep 2012 15:43:10 In Reply to: Re: Yup., ryan [Profile/Gallery] , Mon, 10 Sep 2012 15:14:35 Members do not see ads below this line. - Help Keep This Site Online - Signup |
At proper operating efficiency, there should be about a hundred degree difference in temperature between the inlet and the outlet, where the inlet is cooler than the outlet. The cat has a working temperature of about 800 degrees to 1400 degrees, so as long as it's in there somewhere it's okay - the actual temperature will depend on what it's doing, which of course is a byproduct of getting the right mixture in one side so all the appropriate reactions can happen. If the wrong stuff goes in, cat efficiency drops off and the wrong stuff comes out, too. Modern cars have an oxygen sensor on the outlet of the cat so that engine management can make small tweaks to operations to help ensure cat efficiency is always at maximum, but c900s only have the one before.
I can't count the number of times I was sure my brand new catalytic converter wasn't doing it's job on an LH 2.2 car, and *invariably* it's something else. Usually the AMM, because that is really the singular component we can't check to be sure it's behaving properly. You can check for vacuum leaks, watch the O2 sensor with a DMM, check spark, check combustion chambers, etc., but you essentially need to take it on faith that the AMM - the thing that runs the whole damn show - is doing its job properly. *And you'll never know*. :)
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