As for needing a pipe in the cat for flow thru. There is absolutely no need for it. They use to put resonators on car, which is an expansion camber that helped make big cars even more quite with the muffler. The hollowed out cat is no different then the resonator. Plus the 305 makes so little HP it is just a waste of time and money. I ran a hollowed out factory cat with just the stuffing drilled out for year on a 305. It ran 10,000x better then with the unhollowed out cat. I am sure mine was clogged a bit. Yes the ceramic in the cat gets very very hot. My car never would pass emission before the hollowing, tune ups and carb adjustment never helped, but after I hollowed out the cat and fine tuned the carb to get the best air fuel mix, it passed the state emissions test way under the legal limits for 7 years. Till I stopped driving the car for a 87 CRX Si. Cat's are a myth. It is some Tree hugger feel good crap. In Japan they never ran them and have tougher regulations on emission then the USA. When they imported their cars they had to put Cats on them because of US law even though they burned better then the US cars with cats.
Hollowing out a cat converter?
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Cats do nothing?....that's strange cause my Pathfinder would not pass the emissions test but it did after I changed the cat. I have high flow spun cats on my GP that were designed for race cars and what they hold back you wouldn't notice. I'm not a tree hugger but I do like my money, it's a $385 fine if you get caught altering an emission control device in my province and they can impound your car.
pontiacgp said:
I agree with Pontiac GP my 97 XJ wouldn't pass for diddly squat til i had a magnaflow obd2 cat. I have some 60 dollar cats from Summit installed on mine with 2.5 inlet and outlets. Didn't make a whole lotta xtra HP but sure satisfied the emissions inspector, though my GP has Hooker long tube headers with air injection pipes and a true dual exhaust... :wink: as for the straight pipe its probably 2.25in pipe..Cut it off and measure it then go the parts store or the exhaust shop shouldn't cost that much and get one welded in.
OBD2 and OBD1 are 2 different animals all together. OBD2 measures back pressure before and after the catalytic converter. That eliminates the ability to hollow out a converter. We had a 99 cougar that had 3 catalytic converters. 2 up flow and 1 down flow. The up flow are also the exhaust manifolds. These cars are know for leaking intake plenum and causes an over rich system, in turn they will clog and burn out the up flow cats. It is over $800 for the manifolds with the cat material in them. The K member has to be dropped out of the car with the engine and transmission connected to change the manifolds. I only changed the 3rd [down flow] converter which was plugged with the up flow converters waste. The laws stated at the time that a car could pass emissions with engine codes as long as its gas levels where with in tolerance. The car blow just as well with 1 converter as it did with 3, almost 0 emissions. 3 years later the laws changed and no car can pass with engine codes regardless of its emissions level. So the car failed do to low back pressure code even though it was way below the legal limit in it emissions level. I have owned over 30 car in the past 20 years and own 11 right now. I just moved away from St louis missouri after 16 year. Their laws on emission are as tough as any in the country. They have vehicle inspections also. It is a physical inspections of wear items such as the suspension, brakes, tires, exhaust system, mirror, windows, and electrical, plus emission.
A 1985 Grand Prix 305 with out a converter with a well tuned engine WILL pass emissions. The car that I hollowed out was a 1984 305 Grand Prix it passed a tread mill test the last year I drove it and it passed 6 years of tailpipe test in St. Louis missiouri. All test were with a hollowed out converter. It didn't just barely pass it passed with 50% to 75% less then the legal limit of all bad emissions gases. It passed better then a 1988 fuel inject fresh tuned up reliant K car with 50,*** miles on it with a functioning converter that just passed before the 84 grand prix was test. I owned both cars and took them up with my wife for testing to get our emissions sticker on both.
If the government was really concerned they would make cars run on Ethanol, it makes Zero emissions. But that would make oil worthless and bankrupt the middle east and texas. The scientific community had no trouble setting off a Hydrogen Bomb in the atmosphere. They believe before the test that the fusion from the explosion would chain react with the hydrogen already in the atmosphere and turn the surface of the planet into the sun. killing everything on the earth. They still went a head and set it off with there finger crossed. How is that for some global warming.
A 1985 Grand Prix 305 with out a converter with a well tuned engine WILL pass emissions. The car that I hollowed out was a 1984 305 Grand Prix it passed a tread mill test the last year I drove it and it passed 6 years of tailpipe test in St. Louis missiouri. All test were with a hollowed out converter. It didn't just barely pass it passed with 50% to 75% less then the legal limit of all bad emissions gases. It passed better then a 1988 fuel inject fresh tuned up reliant K car with 50,*** miles on it with a functioning converter that just passed before the 84 grand prix was test. I owned both cars and took them up with my wife for testing to get our emissions sticker on both.
If the government was really concerned they would make cars run on Ethanol, it makes Zero emissions. But that would make oil worthless and bankrupt the middle east and texas. The scientific community had no trouble setting off a Hydrogen Bomb in the atmosphere. They believe before the test that the fusion from the explosion would chain react with the hydrogen already in the atmosphere and turn the surface of the planet into the sun. killing everything on the earth. They still went a head and set it off with there finger crossed. How is that for some global warming.
As to the hydrogen bomb, very few scientists thought it was even possible, and even they said the possibility was almost zero. Theres simply not enough hydrogen, and you need the hyrdogen to be at extreme pressures.
ethanol; where do you think we will get the billions of gallons of it per year?
ethanol; where do you think we will get the billions of gallons of it per year?
UOFLcards said:
Getting back on topic..........just measure the diameter of the existing pipe and get that size. Are you looking to weld in or bolt in a section?
http://www.cbsnews.com/stories/2006/03/ ... 4254.shtml
Ethanol is made from plant sugar. Stocks, leaves, and all vegetation bi product can be used in some form of the distillation. How much Silex do you think the midwest has. I bet 90% of it is turned over in the field. It would make trillions of gallons. How did a third world county do it. See the article on Brazil above. Cocamar plant alone makes 92,500 gallons a day. That is almost 35 million gallons a year. 1 distillation plant that was 1 distillation plant.
I know a guy who has bored out the idle circuits of quadrajets and holleys to run 100% Ethanol and E85 on 60's muscle car that run 12 to 1 compression or more. E85 will run up to 14 to 1 compression with no detonation. Cooler cylinder temperature and way less emissions. He distills his own at home from a local supermarket's produce department. He picks up their rotten stuff and takes it home. All legal.
Ethanol is made from plant sugar. Stocks, leaves, and all vegetation bi product can be used in some form of the distillation. How much Silex do you think the midwest has. I bet 90% of it is turned over in the field. It would make trillions of gallons. How did a third world county do it. See the article on Brazil above. Cocamar plant alone makes 92,500 gallons a day. That is almost 35 million gallons a year. 1 distillation plant that was 1 distillation plant.
I know a guy who has bored out the idle circuits of quadrajets and holleys to run 100% Ethanol and E85 on 60's muscle car that run 12 to 1 compression or more. E85 will run up to 14 to 1 compression with no detonation. Cooler cylinder temperature and way less emissions. He distills his own at home from a local supermarket's produce department. He picks up their rotten stuff and takes it home. All legal.
UOFLcards said:
I wish I could tell you the size, but I'm not 100% sure; I think it's 2"
You could wrap a piece of wire or string around the pipe and then measure that to get the outside diameter. Another possibility is to remove the cat and cut a small section out to take with you to the parts store. IIRC, the cat bolts on using two flanges, which will have to be cut off anyways to do what you want to do. I'm guessing for a bolt on deal you will probably need to piece together a center section, along with two adapters, then clamp together.
BTW, what's with all the threadjacking? If you guys want to discuss ethanol, obd, or other topic, start your own discussion.
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