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Message
re: Thieves stole my catalytic converter
Posted on 9/22/18 at 10:34 pm to East Coast Band
Posted on 9/22/18 at 10:34 pm to East Coast Band
quote:
Buy it back from either Craigslist or EBay. Bound to show up on one of those 2 websites.
Negative. They sell them to the scrap metal buyer
Metal/Material Current Price
Small Foreign Cat $62-$78/each
Medium Foreign Cat $75-$95/each
Large Foreign Cat $102-$197/each
Foreign Pre-Cat $25-$37/each
Domestic Cat $40-$51/each
Pre-Domestic Cat $17-$25/each
Small GM Cat $67-$81/each
Large GM Cat $77-$95/each
Regular Breadloaf Cat $75-$88/each
Small Chrysler Cat $47-$58/each
Large Chrysler Cat $63-$77/each
Ford Cat $57-$72/each
Ford Pre-Cat $18-$25/each
Bead Cat $18-$27/each
Diesel Cat $5.00-$250/each
Small Wire $9-$12.00/each
Large Wire Cat $30-$41/each
Wire Pre-Cat $6.75-$9/each
Half Cat Varies, Ask
LINK
1
Posted on 9/22/18 at 10:36 pm to weadjust
I had a guy come buy my DPF/CAT from my F250 for $125 a while back. He said he'd get them all over, and bring them to somewhere in Ohio
Posted on 9/22/18 at 11:17 pm to Retrograde
quote:bullshite, I don't know if it happens much now but a few years ago this was a big thing.
no one is wasting their time stealing cat converters.
Posted on 9/23/18 at 8:25 am to AUFANATL
You might find one at a scrap yard or pull your part place. Why put a new item on a clunker unless you need to?
Posted on 9/23/18 at 8:44 am to gumbo2176
quote:
never had an issue when getting an inspection sticker.
You guys do know that most places don't even so they money grab known as inspection stickers. Never even heard of them until I started posting on this site.
Posted on 9/23/18 at 9:29 am to baseballmind1212
quote:
How else do you efficiently remove the exhaust gas from the combustion chamber without back pressure
You'll have to explain to me what you mean. How does increasing back pressure aid in the efficient removal of exhaust gas from the combustion chamber? Or am I missing the intent of your statement.
Posted on 9/23/18 at 11:24 am to Ponchy Tiger
quote:
bullshite, I don't know if it happens much now but a few years ago this was a big thing.
It is a police are reporting the rate is climbing again the the prices for those metals are increasing. Some states now passed laws that places(junkyards, etc.) can no longer pay cash for scrap metal over $25 and have to mail check. On average people are getting around $150 currently on the market.
It is no different then people going into really old homes that ares sitting empty and strip out all the copper wiring except this is quicker and as buck.
Posted on 9/23/18 at 11:35 am to Tempratt
quote:
back pleasure and loss of power.
Please, this is a family site.
Posted on 9/23/18 at 11:36 am to mdomingue
quote:
You'll have to explain to me what you mean. How does increasing back pressure aid in the efficient removal of exhaust gas from the combustion chamber?
Because exhaust gasses move in pulses, not a steady flow rate. Each pulse helps scavenge exhaust gas from another cylinder which also helps draw in a fresh cylinder charge as the valves overlap. Well designed exhaust systems can achieve higher VE than poorly designed systems, too little back pressure can lose horsepower and torque.
Posted on 9/23/18 at 11:44 am to AUFANATL
quote:
worthless junkie thieves come back and hit my apartment complex again?
Move
Posted on 9/23/18 at 1:06 pm to Retrograde
quote:
no one is wasting their time stealing cat converters.
wrong.
Again.
Posted on 9/23/18 at 1:28 pm to CaptainBrannigan
quote:
You guys do know that most places don't even so they money grab known as inspection stickers. Never even heard of them until I started posting on this site.
I know it's a money grab by the cities, and to emphasize that point, I live in New Orleans and they have their own version, as opposed to a state inspection sticker that almost all other municipalities can get=====and cheaper too.
Posted on 9/23/18 at 1:58 pm to Clames
quote:
exhaust gasses move in pulses, not a steady flow rate.
That is only because exhaust is dumped into the manifold in pulses, essentially like any fluid being pump.
quote:
Each pulse helps scavenge exhaust gas from another cylinder which also helps draw in a fresh cylinder charge as the valves overlap.
I think you are confusing the reflected waves on a tuned 2 stroke exhaust system that actually creates a lower exhaust back pressure at the valve. Even then, any additional "backpressure" is coincidental to creating the desired scavenging effect. This can be obtained by either adding a restriction at a nodal point or by simply lengthening/shortening the exhaust pipe to achieve a nodal point where the exhaust exits, thereby limiting the restriction. So then the "added" back pressure is the result of the wave reflected back and not a flow restriction.
quote:
Well designed exhaust systems can achieve higher VE than poorly designed systems[\quote]
I have yet to see a 4-stroke consumer engine where this is the case, but I'll give you that this probably is true in high performance racing engines. I seriously doubt the design of a consumer vehicle will be negatively impacted by the removal of the catalytic converter, though.
Designing a 4 stroke system to properly scavenge is difficult at best, particularly with the added need for some of the pollution control systems.
It is simply done on 2 stroke systems, on smaller engines often consisting of a straight piece of pipe of appropriate length.
[quote]too little back pressure can lose horsepower and torque.
That is an inaccurate statement at best. The increase in backpressure on any tuned system is a side effect rather than intentional. When engine exhausts are tune, all effort is made to minimize back pressure as much as possible, using as straight and large a path out as possible. Using discontinuities (ike the end of the pipe in smaller engines) to generate the reflection that causes the scavenging.
Here is a really good article on backpressure and scavenging. https://www.roadandtrack.com/new-cars/car-technology/a14530205/what-is-exhaust-backpressure-and-why-is-it-bad-for-horsepower/
quote:
Basically, when people claim that a certain amount of backpressure is beneficial, they're mixing up backpressure and scavenging. The latter is a phenomenon where the movement of gases through the exhaust system creates a partial vacuum that can actually suck the exhaust out of the cylinder
Posted on 9/23/18 at 2:16 pm to mdomingue
quote:
That is only because exhaust is dumped into the manifold in pulses, essentially like any fluid being pump.
Centrifugal pumps, amongst other designs, don't pump fluids in pulses. But I already stated how exhaust moves so what point you were trying to make here is anyone's guess.
quote:
I think you are confusing the reflected waves on a tuned 2 stroke exhaust system that actually creates a lower exhaust back pressure at the valve.
You would be wrong. I need to dig up my copy but there was a great book written in the 1930's that explained, in great detail, the fundamental engineering of what I am actually talking about here.
quote:
Here is a really good article on backpressure and scavenging.
That's not even close to a good article and it attempts to simplify the phenomenon I'm talking about to such a level that it greatly skips over some fundamental concepts. This is the problem with people who rely on Google searches rather than going to a library. LA Tech's library has a whole section on automotive engineering including a book that covered early Formula 1 race engines and the development of exhaust systems and what was learned. Some of those concepts from the 50's and 60's have been made into gimmicks hawked in later decades. You need to do a lot more research.
Posted on 9/23/18 at 2:24 pm to AUFANATL
how hard are those to install?
Posted on 9/23/18 at 3:14 pm to Clames
quote:
Centrifugal pumps, amongst other designs, don't pump fluids in pulses. But I already stated how exhaust moves so what point you were trying to make here is anyone's guess.
Just pointing out the reason for the pulsation, I guess I should have pointed out I was referring to positive displacement pumps, I thought that was implied by the context, but I should have been more clear. Centrifugal Pumps can also produce pulsation but that is a function of the suction head pulsating, not of the pump itself.
quote:
This is the problem with people who rely on Google searches rather than going to a library.
Most of my knowledge comes from discussions in a machine design class with a professor with a Ph.D. from LSU in Mechanical Engineering. But that was back in the 80s so maybe physics and mechanical engineering has changed since then. I have a degree in Mechanical Engineering.
The guy who wrote the info for the article and does the youtube presentation is a Graduate Mechanical Engineering Student at NC State.
You are wrong about the exhaust back pressure. But I appreciate your enthusiasm. Are you an engineering student at La Tech? Talk to one of the ME professors there about this. And good luck in your scholastic endeavors, whatever they are.
I will agree that if the guys exhaust were tuned to maximize scavenging, then removing a component haphazardly would likely reduce horsepower.
This post was edited on 9/23/18 at 4:31 pm
Posted on 9/23/18 at 3:29 pm to LNCHBOX
quote:
What makes you think a new cat costs $1250?
Depends on the vehicle. On one of my older ones had two and the front one basically disentegrated and had to get everything replaced. I sold the car because it was going to be $3k.
Posted on 9/23/18 at 4:03 pm to AUFANATL
The cores on cat converters bring some good money. They hit a dealer here in town and took several off of vans. Sorry bastards
Posted on 9/25/18 at 6:49 pm to bobbyleewilliams
Preverts
Posted on 9/25/18 at 6:54 pm to AUFANATL
quote:
Sawed it right out from under the car in the middle of the night.
man, that is a hell of a lot of work for a damn used catalytic converter...
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