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Catalytic Converter Removal |
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Fahques
AMC Apprentice Joined: Jan/06/2016 Location: philadelphia Status: Offline Points: 49 |
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Posted: Jul/15/2017 at 10:40am |
I have a 1982 Concord wagon, 258, V6, auto trans. The muffler recently cracked & needs to be replaced. The muffler is welded to the connecting pipes. Since I would have to cut the pipes to replace the muffler, I was thinking about replacing everything from the header pipe to the end and removing the CC and putting in a glass pack with as much straight pipe as possible.
This is my first AMC and what I'm not sure about is if by doing so I am going to mess up the way the car runs by messing with all the 'innovative' emissions stuff or vacuum lines or oxygen sensors or anything else. I guess my question is, can I just remove the exhaust and beef it up with new pipes and a loud muffler ? |
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73Gremlin401
Supporter of TheAMCForum Joined: Mar/02/2013 Location: Stmbt Sprgs CO Status: Offline Points: 941 |
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IMHO, AMC 6cyls with the pulse-air system need the catalyst to operate properly. Question is, does your car have pulse air. It's easy to spot on the catalyst - there will be a roughly 5/8" diameter pipe running from it back up to the engine. If your engine is stock, and everything else emissions wise is in place and operating properly, I'd recommend replacing the catalyst when you do the rest of the exhaust system. If however, you don't have pulse-air, or do but a lot of the system is missing/butchered up, whatever, and you don't have emissions testing in your area, then by all means get rid of it, and finish cleaning up the remnants that may exist under the hood. Note that some of the stuff, EGR, PCV, and TAC are all good things, and if in proper condition with no vacuum leaks and good valves, really do make your stock 6 run a lot smoother, and I'd recommend leaving them in place, or repairing as needed. In general, AMC did a better job with emission controls than the big 3 did on the 6 in the late 70s and 80s, with regard to general driveability. Sometimes stock is better, and if your motor is as delivered from the factory, keeping the emissions stuff as close to OEM as possible is actually a good thing. Again, just my opinion, I'm sure there will be plenty others!! |
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73 Gremlin 401/5-spd.
77 Matador Wagon 360/727. 81 Jeep J10 LWB 360/4-spd 83 Concord DL 4-dr 258/auto |
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FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4741 |
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You won't notice any performance increase by using a straight-through glasspack muffler instead of the stock type chambered (also called turbo) muffler. With the correct size pipe (2" is plenty) just about any muffler will flow more than you need. All you'll do with the glasspack is make your early 80s luxury car sound like a rice burner, but without the performance to show for all the noise. Converters also help make the car quieter, and if they are properly sized and in good condition they have essentially zero impact on performance. That being said, a clogged old converter will murder your performance, and old carbureted engines are dirty enough that they tend to clog up their converter pretty quickly. 2" exhaust pipe, Thrush or Walker turbo muffler, downturned tip. It makes for quiet exhaust, but you get a nice low rumble at idle. It sounds respectable.
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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scott
AMC Addicted Joined: Jul/10/2007 Location: Wildwood Pa. Status: Offline Points: 3498 |
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You'll need the catalytic convertor in place to get your Concord to pass the state inspection in Pennsylvania. Unless you have it registered as an antique car.
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pacerman
Supporter of TheAMCForum Joined: Jul/03/2007 Location: United States Status: Offline Points: 9048 |
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Those old pellet converters lose their pellets over time so if you tap on your converter it may sound hollow, meaning that it is empty. If you are subject to a visual inspection (only) to pass the "emissions" test, I would leave it in place. Joe
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Happiness is making something out of nothing.
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FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4741 |
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^ Yep. If I had a car with a pellet cat, I'd pull the drain plug and let all the pellets out, then sell them for platinum. People do the same with monolith cats, though there isn't much reason to. A good monolith cat doesn't restrict unless the engine is out of tune and plugs it up...which a lot are. |
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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tomslik
AMC Addicted Joined: Mar/07/2008 Location: Colorado Status: Offline Points: 680 |
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67 american 290/4speed |
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amcfool1
AMC Addicted Joined: Jun/18/2011 Location: roanoke va Status: Offline Points: 1071 |
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hi, in 82 there was no "pulse air" system, that didn't come 'till 84. 82 should have an "air injection" cat, ie, still using an air injection (smog) pump. those tubes tend to rust out, and are no longer available, so, unless you fab your own, best to go with a NON injection cat. new cats are not very restrictive, (or that expensive) and will keep you legal. i HIGHLY recommend you keep a cat. converter. Unless you have a working air injection system, replace the cat. converter, without it's air injection, it can overheat (or not, but why take a chance) and roast your carpet and may even start a fire, the newer ones are much better, good luck, gz
ps, love to see that 258 V6!:)
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george z
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16591 |
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On certain cars, the EGR needs backpressure to open. (some GM cars did) AMC used Delco EGR valves, (althrough I have a AMC 360 with the Chrysler EGR valve).... and usually if you keep everything working and hooked up correctly, it will run good.
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FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4741 |
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I wouldn't worry about throwing off the EGR with an exhaust change. I have two engines with positive backpressure EGR: one is a 1977 AMC 232 I6 and another is a 1977 Buick 231 V6. I drove both of them with their stock exhaust systems (both 2" systems with converters) then I drove them again with improved, higher flow exhaust systems (2" or 2.25" with no cat) and noticed zero change in performance or how the EGR operated. I've even driven them with no EGR what so ever and they didn't ping or have any ill effects. Some engines will ping without their EGR unless the timing and fuel mixture are changed, but mine never have.
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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