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1983 rx7 with racing beat exhaust no catalyst runs fine but smells like its running too rich and it gets terrible mileage?
Wiki User
∙ 16y ago
i believe the smell and low mileage are directly related to you removing the cat. heres why.... 1) Cats are primarily designed to remove harmful NOx gasses from the exhaust stream by heating them up to around 600+ degrees. imaging lighting a match, theres never any smoke until the flame goes out therefore the hotter something is the more complete the combustion is. Cats work on the same principle. so you will have a lot more toxic gases coming out of your exhaust with out a cat which will alter the way the exhaust smells hence it will smell similar to a car wich is over fuelling. 2) due to the above process backpressure is created as a side effect of the NOx scrubbing process which in its most basic form will restrict the flow of gasses out of the exhaust stream. as the engine is having to fight this resistance power and therefore mileage will drop. when removing the cat you are taking away this restriction which will decrease your mileage but increase the power output of the block. given the nature of the RX7, which as standard produces more exhaust gases and get less mileage than the average piston engine the removal of the catylizer is only ever going to aggravate the situation. the only option really without reverting back to the original catalytic converter is to go with a racing Cat -these will scrub the NOx more to reduce the smell but will do next to nothing to increase mileage. i believe bonez make a very good racing cat. hope this helps.
Wiki User
∙ 16y ago
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What do catalytic converter's do?
Combustion engines produce, in their exhaust, a number of nasty chemicals. The purpose of a catalytic converter fitted to the engine's exhaust system is to convert these nasty chemicals into harmless ones to provent environmental pollution. ------------------------------------------------------------------------------------------------------------------------------------------- Reduces the toxicity of internal combustion engine exhaust. It uses a catalyst and a chemical reaction to convert toxic combustion by products into a less toxic substance. A catalytic converter takes the exhaust gas stream from the engine and breaks the noxious components of the exhaust down to less noxious or harmless components. To reduce auto emissions. The catalyst in a catalytic converter causes unburned hydrocarbons to oxidize. To do so, oxygen must be present in the exhaust mixture. If an engine is running well, there isn't really much for the catalytic converter to do. If the engine is in need of a tune-up, the catalytic converter may get quite a workout and in the process it can get very hot. Also, deposits can build up on a catalytic converter, making it useless. If the engine is running poorly, and a lot of unburned fuel is going out the exhaust, deposits from the fuel can build up on the catalyst. If the engine is burning oil, oil deposits can also build up. It converts carbon monoxide, which is very deadly to all animals into carbon dioxide, which is not near as bad for the environment and it also helps prevent greenhouse gases because of this.
What does a catalytic converter do?
Combustion engines produce, in their exhaust, a number of nasty chemicals. The purpose of a catalytic converter fitted to the engine's exhaust system is to convert these nasty chemicals into harmless ones to provent environmental pollution. ------------------------------------------------------------------------------------------------------------------------------------------- Reduces the toxicity of internal combustion engine exhaust. It uses a catalyst and a chemical reaction to convert toxic combustion by products into a less toxic substance. A catalytic converter takes the exhaust gas stream from the engine and breaks the noxious components of the exhaust down to less noxious or harmless components. To reduce auto emissions. The catalyst in a catalytic converter causes unburned hydrocarbons to oxidize. To do so, oxygen must be present in the exhaust mixture. If an engine is running well, there isn't really much for the catalytic converter to do. If the engine is in need of a tune-up, the catalytic converter may get quite a workout and in the process it can get very hot. Also, deposits can build up on a catalytic converter, making it useless. If the engine is running poorly, and a lot of unburned fuel is going out the exhaust, deposits from the fuel can build up on the catalyst. If the engine is burning oil, oil deposits can also build up. It converts carbon monoxide, which is very deadly to all animals into carbon dioxide, which is not near as bad for the environment and it also helps prevent greenhouse gases because of this.
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A catalytic converter overheats due to an excess of unburned hydrocarbons reaching it through the exhaust stream for an extended period of time. This overworks the catalyst bed inside the converter, which then starts to become plugged, generating even more heat as it does. In short order, the converter will become a significant exhaust obstruction, causing the engine to overheat and lose power. Eventually, this will prevent the engine from running, due to the inability of the exhaust to escape, denying the engine the opportunity to "breathe"...
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