Exhaust??

[_92_SPORT_]

So my tail pipe on my explorer has fallen off...it has rusted right off after the muffler. I look up the cost to get a new tail pipe and to just put a new on on the muffler, that would be about 35 bucks...but i wouldnt mind having a louder exhaust system if i was to just take the tail pipe and and leave everything else alone and leave the muffler on or should i cut the muffler off. If i cut the muffler off should i be putting a tail pipe in still?....Or i was even thinking of just putting a glass pack in place of the muffler with no more piping after the glass pack??or continue a tail pipe off the glass pack???

 

[wood1]

Your exhaust system has to expel the exhaust gas so that it does not collect under the truck. This prevents you and your passengers from being poisoned by carbon monoxide gas. The law no doubt requires you to have a muffler in Manitoba as well as a tailpipe. Pickup trucks can often have the exhaust terminate under the box but the Ex is all one piece like a car. You could dump your exhaust in front of the tire if you are looking for a custom look...

How's the flooding? Receding yet?

 

[_92_SPORT_]

haha funny you mention the flood...uh yeah i think it is slowly going down. But we still have stores and streets closed.

As for the exhuast.. so if i was to put say a cherry bomb in place of the muffler would that work then just run the tail pipe...and would having bends affect sound..should i find a way to straight pipe it? I dont have much money right now and just want somthing cheap and to sound decent.

 

[wood1]

Yup, the cherry bomb and tailpipe will get it done. Those things are pretty loud I find... legal though. I wouldn't worry about messing with the straight pipe, you will have problems getting it past the rear axle and spare tire without the bend tailpipe I would think. Maybe a shop with a pipe bender could do it cheaper?

 

[_92_SPORT_]

ok thanks man...if i was to go straigh i think only the axle would be the problem my spare tire isnt there anyway...i might even be able to salvage the old tail pipe and just throw the cherry bomb in depends how long a cherry bomb can get to be

 

[wood1]

Cool, glad to help.

 

[94Gexplorer]

to make it easier you could just put a 90 or 45 degree pipe on the end of the cherry bomb mines like that and its just fine for me

 

[Anime]

You could get a DynoMax Super Turbo catback system for cheap, they are offering a $75 rebate through the summer, making the system (front pipe, muffler, rear pipe, and clamps) cost less than just a cherry bomb muffler would.

 

[Nedwreck]

Dymomax: http://www.summitracing.com/parts/WLK-17415/

 

[Naasau]

Besides, your engine is designed to work with back-pressure, so having a good muffler (even a loud one) will be better for your engine than a cherry bomb. And you won't sound like a wannabe rice burner. Which is always a plus. Also, if you have rust there, then Anime's suggestion to do a full cat-back replacement is probably a good one, that way you don't have to spend ridiculous amounts of time/money hunting leaks. Especially if you don't own a welder.

 

[FIND]

Besides, your engine is designed to work with back-pressure, so having a good muffler (even a loud one) will be better for your engine than a cherry bomb. And you won't sound like a wannabe rice burner. Which is always a plus. Also, if you have rust there, then Anime's suggestion to do a full cat-back replacement is probably a good one, that way you don't have to spend ridiculous amounts of time/money hunting leaks. Especially if you don't own a welder.

No. Never say back-pressure and engine in the same sentence again, while associating the two in a positive manner. NO engine is made to work with back-pressure. Back-pressure is an old wives tale invented by shadetree mechanics who don't understand fluid dynamics and couldn't figure out why they lose power when they put gigantic exhaust pipe on to replace their stock pipe.

A proper size and length exhaust system creates a scavenging effect that will pull the exhaust through at a higher velocity than if it were flowing naturally. Improper size causes turbulent exhaust flow, which makes exhaust flow slower causing, (insert suspense music) back-pressure, which makes you lose power.

All of that said, don't expect much out of a catback. The OEM exhaust system is not THAT restrictive, and a catback alone won't make that much improvement in the pumping efficiency of your engine. But, given the current price of the dynomax system, it is MORE than worth it, and it will still give you a small gain, while at the same time guaranteeing that most of your exhaust system will last at least another 5-10 years.

 

[tweakedlogic]

No. Never say back-pressure and engine in the same sentence again, while associating the two in a positive manner. NO engine is made to work with back-pressure. Back-pressure is an old wives tale invented by shadetree mechanics who don't understand fluid dynamics and couldn't figure out why they lose power when they put gigantic exhaust pipe on to replace their stock pipe.

You contradicted yourself there. the huge pipe had no back pressure. It also cost velocity. Which is why it didn't work. Some backpressure is needed. The scavenging effect takes place due to reflected waves, both pressure waves and acoustic.

Go for the 2.5" cat back. While you are at it, get a new catalytic converter for $65 from Summit. Knock it all out at once and forget it for another 10 years.

 

[FIND]

You contradicted yourself there. the huge pipe had no back pressure. It also cost velocity. Which is why it didn't work. Some backpressure is needed. The scavenging effect takes place due to reflected waves, both pressure waves and acoustic.

Go for the 2.5" cat back. While you are at it, get a new catalytic converter for $65 from Summit. Knock it all out at once and forget it for another 10 years.

No, back-pressure is not needed and I did not contradict myself. When the exhaust hits a larger pipe, it is no longer moving in just one direction, since it is free to expand to fill the larger volume, which creates turbulence. Turbulence causes back-pressure. When exhaust is flowing through a pipe that is properly sized, it will only move in one direction and the pulses from the exhaust will cause a vacuum in its wake, which pulls more spent gasses through during valve overlap. That is the effect of scavenging, not some idiotic idea about back-pressure. When there is a larger volume of exhaust, then you need a larger diameter of pipe, which is why exhaust isn't a one size fits all game, and you are either sacrificing some on the low end or some on the high end.

Perhaps it is my fault for not explaining it thoroughly in the paragraph that followed the one you quoted, but as many times as I have tried to explain it to some people on here, and as long of explanation as I have provided..... well, it gets old.... I would think that people would be smart enough not to come on half-****ed and start arguing based on things they don't know. Go learn about fluid dynamics or even the basics about automotive engineering and I guarantee you won't be arguing with me on this subject.

BUT, just to back me up on this, let's see how many other rants I can come up with in 30 seconds supporting my statement

http://www.uucmotorwerks.com/html_product/sue462/backpressuretorquemyth.htm
http://forums.focaljet.com/team-tech/417204-back-pressure-myth-fact-theory.html
http://www.gomog.com/allmorgan/exhaustbackpressure.html
http://www.thumpertalk.com/forum/showthread.php?t=659727
http://pineboxonline.com/backpressure.html

 

[tweakedlogic]

You realize three of those links originated from the same text.
And, none of them talked about the scavenging effect of the two different reflected pulses.
But this isn't the place to argue about exhaust design. the guy just wanted an answer about his tail pipe.

 

[FIND]

You realize three of those links originated from the same text.
And, none of them talked about the scavenging effect of the two different reflected pulses.
But this isn't the place to argue about exhaust design. the guy just wanted an answer about his tail pipe.

You didn't even bother reading them did you?

You don't know what you are talking about so don't try and contradict me. Heck, it is pretty obvious you don't even know what scavenging is beyond a light shadetree knowledge. BUT, if you do think you do know, you are welcome to try your hand at some actual physics to back up your statement.

 

[tweakedlogic]

You didn't even bother reading them did you?

You don't know what you are talking about so don't try and contradict me. Heck, it is pretty obvious you don't even know what scavenging is beyond a light shadetree knowledge. BUT, if you do think you do know, you are welcome to try your hand at some actual physics to back up your statement.

No thank you. I've considered discussing this with you, but it seems you don't want to discuss, only flame. There was no venom in my posts, but your posts seemed to be dripping with it.

I never contradicted you, until just now. I never even said you were wrong. A little narrow sited maybe. _92_Sport doesn't need to squeeze every drop of power from his exhaust. I would hazard to guess no one on this forum does. Exhaust systems are forgiving for the average driver. As long as they don't go overboard. 92 Sport just wanted some suggestions for his tailpipe. I offered mine with a little elbow nudge to you.

What's do you have against shade tree mechanics. They don't have to design a car from scratch, just get it to do what they want. Usually with out formal training in the area. BTW, I get paid very well for my wrenching. But I started as a shade tree wrench.

It doesn't take physics to back up a statement that the web articles quoted each other. just a bit of time to read. Start with the last link and work up.

I didn't mean to upset you. I have actually enjoyed reading some of your threads. But you have annoyed my with your belligerence.
Smile more.

 

[FIND]

I have nothing wrong with shadetrees. I only said that people tend to fill in guesses for actual knowledge. I don't have any problem with you personally or anything else like that. I just don't want anyone spreading false information just because they feel it is the truth. Backpressure is never beneficial to an engine. Turbulence from oversized pipe causes backpressure, undersized pipe causes backpressure and rough bends or restrictions cause backpressure.

Reflected waves do not in any way help your exhaust function, sound or otherwise. The engineering sounds really pretty when they use those words in a flowmaster commercial, but a reflected wave is a force pushing back. This would result in a restriction in flow.

Scavenging is what is happening when an exhaust pulse creates an area of low pressure in its wake which results in it pulling additional gases along with it. A restriction or turbulence disrupts this effect. Scavenging is basically additional pumping efficiency in your engine during valve overlap. This is why the best exhaust designs frequently feature equal length runners, tuned length and curves, H or X pipes in many cases. These are all designed to maximize the effects of scavenging and exhaust flow by reducing reflected waves from collisions of pulses and by allowing for the maximum velocity for the exiting gasses.

I was paid good money for a good number of years to be a mechanic as well, and yeah, I started out doing it in my driveway, but then I went to school. After I was done turning wrenches for a living, I went back to school again and learned enough math and physics to make my head spin. I'm not interested in having a pissing contest with you or arguing about who turned wrenches. I am no, and have been trying to tell you that you are wrong, it is a common misconception, and I gave you the first 5 links I came across that demonstrate this point. Sure I could have searched more and sure, I could have made sure that none of them were quoting others for information, but I had hoped that seeing this type of stuff would inspire you to do some research of your own instead of just relying on your faith that you are right. I don't argue anything with anyone without first checking to be sure I am right, and then checking to be sure that the sources that agree with me are right.