Muffler Exhaust

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Muffler Exhaust
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The modern car gasoline powered engine is often described as some incredibly complex piece of machinery. It is not. Every engine has a basic four stroke power cycle. You can do a lot to make this process efficient and produce a ton of power, but it is still the same process when you strip away the fluff. Let's take a closer look.

Most modern engines run on a piston system. Yes, there are rotary and electric engines, but the internal combustion engine is still basically a four stroke piston process. Each piston is attached to the same crankshaft. This makes all 4, 6, 8, or 12 pistons in your car part of a synchronized system.

What exactly are we talking about when we say a "stroke"? A stroke is simply a movement of the piston. When a fuel and air mixture is fired by a spark club, the resulting pressure created pushes the piston down. This is a single stroke. The movement of a piston down, up, down and up completes one cycle needed to deliver power to the wheels in a car and thus gives us the "four stroke" power cycle.

The "intake stroke" is the first step. In this stroke, the piston is moving down because the crankshaft is being turned by another piston. This downward movement creates suction. The intake valves for gas and air at the top of the chamber then open to let in the fuel/air mixture called for by the electronic computer unit controlling the engine.

The "compression stroke" comes next. The turning crankshaft moves the piston back up in the chamber. This creates massive pressure. The difference between the total space and the size of this "compressed chamber" is known as the compression ration in an engine. Most modern cars have a compression ration of 8 to 1. This means the piston moves up until it is taking up 7/8ths of the chamber.

The "power stroke" is our third stroke. When the compression is maxed, the spark plug sends an electric charge across the gap at its end, known as the electrodes. This ignites the fuel and air in the chamber. Pressure is created and the piston is forced down. This delivers power to the crankshaft and causes it to turn. The turn action moves the other pistons through their non-power strokes and delivers power through the drive train to the wheels.

The "exhaust stroke" is the fourth and last step. As the name suggests, the exhaust is removed form the piston chamber. This happens when the piston starts moving up again. As it proceeds, the valves leading to the exhaust manifold open allowing the exhaust to move out and down to the catalytic convert. From there, the exhaust is passed down the car, through the muffler and out the tailpipe.

The four stroke engine is the dominant power plant we find in the world today. This may change as hybrids and electric vehicles become more popular, but the four stroke engine in one form or another will be with us for a very long time.

Dirk Gibson is with DCJAutoParts.com - where you can find the lowest prices on high performance auto parts and accessories.

How to Install a Magnaflow Muffler on a Mini Cooper S

1. Your Magnaflow exhaust package comes with three pieces—a resonator, center pipe, and muffler section. The front resonator comes with a mounting flange that bolts right onto your stock catalytic converter. This part connects to a center pipe that is secured with exhaust clamps, which are supplied. And the rear muffler section joins together, exiting the car in the center of the rear bumper. Also, all the parts are stainless steel, which don’t rust or stain—nice job Magnaflow.

2. Now to the installation. You will only need a few common tools to remove your stock exhaust; no exhaust cutters are needed. Make sure you have help installing the system, it is very heavy and you will not want to drop it.

3. First, you will remove the factory skid plate/ heat shield from the chassis, which can be down with a socket wrench. Important—Do Not lose this piece as it will be re-installed after you install your new exhaust system.

4. Now follow the factory exhaust up towards the catalytic converter. You will now need to remove the mid exhaust mounting bracket from the chassis as well using a socket. Make sure you slip the exhaust hangers out of the rubber mounting brushings. Set this piece aside with your head shield as you will be reusing it also.

5. Now find the flange on the catalytic converter. It will have two bolts that you will need to remove. Be careful in this process because your whole exhaust system is only supported by two rear hangers on the muffler. This is where it will be handy to have a helping hand. Have your buddy hold up the front section of the system, otherwise it will crash to the ground.

6. You can now go to the back of the car and free the factory exhaust by removing the hangers from the rubber bushings. Congratulations, your factory exhaust has now been removed. You are one step closer to hearing your car’s new growl.

7. If you have gotten the factory exhaust off, you are pretty much in the clear. You will install your Magnaflow system in the reverse order of taking the old one off. You can start by matching up the resonator section with the flange to the flange on the catalytic converter and bolting them together. They slip the connecting pipe into the resonator pipe and clamp it down with the supplied clamp. This piece also connects to the factory chassis mount you removed earlier. Be sure to secure the hangers into the rubber bushings.

8. One more step. Connect the muffler section to the connecting pipe. The best way to do this is to slip the exhaust hangers on the muffler into the hanging rubber bushing first, then swing the rear section up and fit it into the connecting pipe. Then all that’s left to do is tighten down the supplied clamp. I would recommend making sure all your connections are tight and you muffler tips exit your bumper straight. Oh yea, and don’t forget to re-install that skid plate/heat shield.

9. You have just installed your Magnaflow exhaust system. Turn the car and make sure you don’t have any exhaust leaks. If everything is good, then you’re golden. Enjoy your Mini’s new throaty growl and boost in horsepower. Keep working on your Mini folks!

About the Author

Upgrading your Muffler to a Magnaflow exhaust is just one modification that can increase your car’s performance. There exists a plethora of parts that will pick up your car’s pace. Just remember, avoid those speeding tickets. –Mike Rosania

How can I hear how a new muffler or exhaust system will sound?

Before I decide to purchase and have work done on my car, is there a way I can listen to how the new muffler or exhaust will sound like when it is done?

Does it depend on my car at all or is the sound all about the muffler/exhaust?

I have 2003 PT Cruiser, if it matters.

exhaustsoundclips.com
Exhaust companies now has sound filesof thier mufflers on line.. Check the sites of the brands your thinking about

You tube and other vid. hosting sites..

Yes you need to listen to cars with same engine as you have.. The engine type, size and mods done to it will change how the muffler will sound

Police: New Milford man charged with DWI after being stopped for having a noisy muffler
NEW MILFORD -- Police arrested a New Milford man on a DWI charge Sunday after stopping him for having a noisy muffler on his vehicle. According to police, Joshua Zibell , 26, of Wellsville Avenue, was observed driving his vehicle on Railroad Street "with a defective exhaust system."

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