silrossi46
New Member
- Apr 4, 2003
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forced88lx: I had O2 sensors connected when the motor was only n/a and I still had the glowing issue. The smog pump does not cool the converters. It's purpose is to help aid in the full oxidization process. BTW, when I had Larocca introduce the smog pump to blow air to the converters, they glowed much hotter and much quicker. The exhaust fumes are unbearable and that is why I can't run with an offroad hpipe. Eyes and nose burn like crazy. Fumes are way too abundant. Larocca has tried two different cams that have better emissions qualities with no resolve.
forced88lx said:Actually blowing 1-2 pounds of air into the exhaust before the Catalytic Converter COOLS THEM. When you add outside air to the exhaust which is 300-400 degrees COOLER, its going to drop your exhaust temperatures down to a level where it doesn't melt your converters.
forced88lx said:Actually blowing 1-2 pounds of air into the exhaust before the Catalytic Converter COOLS THEM. When you add outside air to the exhaust which is 300-400 degrees COOLER, its going to drop your exhaust temperatures down to a level where it doesn't melt your converters.
If you run without a smog pump with cats, you run a great risk of melting the converters. As a result, they will get plugged, not flow and have tons of back pressure.
If your converters have already begun to Melt (Which I suspect they have) then added the extra air to the backpressure that you are experiencing will even further make your converters a blow torch.
Got any idea how a blast furnace works? If not try this next time you fire up the grill: once the charcoal gets going real good, grab an electric fan and blow it on the coals. Even though you're blowing air that is WAY cooler than the coals, it sure as hell doesn't cool them off, does it? Air is 21% oxygen. Force it into a fire, or hot cats, the fire gets hotter. You have to remove the fuel before forced air can cool.
4.6s have eliminated the smog pump and the converters on these cars have no provision for any secondary air injection. Are these cats subject to overheating right from the factory because of this?
forced88lx said:No they are designed differently. The Emissions system of the 4.6L Cars are Different than the 5.0L cars.
bmo37 said:don't the 4.6 cars have 2 preheaters and 4 cats as opposed to the 5.0's 2 preheaters and 2 cats, stock speaking of coarse. Also whats the point of the mil elminators on the 4.6's when u remove the smog equipment
forced88lx said:Yes I do actually. A blast Furnace has no back pressure above the fuel source. The heat generated is due to the focus of the fuel and the ignition point. That is the hottest part of the blast furnace.
forced88lx said:Now lets take the combustion engine. The hotest place of the internal combustion engine is in the cylinders or 2-3 inches outside the exhaust ports. Once the exhaust gases travel 18" they lose a incrediable amount of heat. Now if you mix cooler air into the stream at this point, the exhaust temperatures cool even futher. You know sort of the same thing as Military Aircraft (Which is apparent that you dont know of this technology). If you mix cooler air into the exhaust stream of a fighter jet, (Just like the smog pump does on a automobile), it cools the exhaust a lot.
forced88lx said:Your reference of a blast furnace doesn't apply in this case, because as the exhaust (Spent fuel) travels down, it doesn't heat up any futher.
forced88lx said:The only way your exhaust can heat up is if you have a obstruction. Like catalytic converters which are melting on the inside. THis backpressure will cause more friction and more heat due to the fact that you are COMPRESSING the gas.
Having a smog pump on a automobiles exhaust COOLS it and also helps the catalytic converters work. If a car's Exhaust gases are too hot, then it will FAIL emission standards. Today some car manufacturers put their catalytic converters so far down the exhaust track that there is no need for a smog pump to cool the exhaust before it enters the primiary catalytic converters. However on the 5.0L Mustang the Smog pump actually cools the exhaust so that you do not melt the converters and adding air helps maintain the emissions standards.
yeah i think when u swap to an offroad pipe right? the mil kills the check engine lightslvr302 said:MIL eliminators is so you dont throw the check engine light I thought. If I remember correctly, my buddy's 99 cobra has an aftermarket Bassani catted x-pipe with no provisions for secondary air injection. I am not sure how the exhaust setup comes from factory. I am almost positive they don't have a smog pump.
89MustangGX said:I skimmed throuhg all the posts in here, and I don't think I saw this mentioned, so I'll throw it out here:
If you got the cats really hot, you might have just melted them. If the car is at a point now where it runs fine without the cats and when you put them on it doesn't -- try a different set.
Catalytic converters are designed to run hot enough to burn any unburned fuel in the exhaust gasses. They can't do that if they're cool. Hot exhaust gasses are generally cleaner, because of the abscence of raw fuel.
forced88lx said:Actually Catalytic converters are NOT designed to burn ANY unburned fuel. They are designed to force a chemical reaction to change certain gases in the exhaust into water by a forced reaction, there by reducing the hydrocarbons in the exhaust. However there is a narrow temperature range that this can occure in. If you exceed that temperature range, then you will MELT your converters.
FACT Raw fuel that enters a catalytic converters will DESTROY THEM. Catalytic converters are NOT Designed to have raw fuel going through them.
forced88lx said:Sarge Just got
Wknd_Warrior said:Forced88lx... check this out. http://auto.howstuffworks.com/catalytic-converter2.htm You are not quite right about all that... Sarge is actually more accurate in what he is saying. You are wrong about there not being "raw" fuel in the exhaust... whatever raw means... It is unburned... I consider that raw.
Anyway... I would say try another Cat H-pipe... eventhough the stocker you tried also got hot. Doesn't mean anything. Parts go bad, and new parts too.
Why is it you are not running O2 sensors, but you are running cats?
Catalytic converters are designed to run hot enough to burn any unburned fuel in the exhaust gasses.