What are headers and what is its' purpose?

Question

OK I KNOW IT REPLACES EXHAUST MANIFOLD TO PRODUCE CLEANER AND MORE AIRFLOW. BUT ULTIMATELY LEADING TO WHAT??? HOW DOES THIS PROCESS EFFECT THE VELOCITY (SPEED) OF THE CAR?? WHAT IS THE SCIENTIFIC ANALOGY OF WHAT IS HAPPENING HERE?

EVERYONE TALKS ABOUT GETTING HEADERS AND I ASK WHY? AND THEY'RE LEFT WITH NO COMMENT...

Answer 1

Picture a sideways tornado. You watch the air circulate around and around. As you watch the funnel of air move, you will see air streams within it. If you can get all airstreams to move together in unison, and with no waffling effects, you have a better flow rate.

Headers are engineered and tested to get all the exhaust air from your heads (engine) out in the same flow rate, and same flow pattern, to meet up with the same pressure or force, as they leave the header and go to your exhaust pipe.

Why? Take a V-8 engine. each side of the engine has 4 cylinders. They all run the same amount of air and force. Now, as the burnt gasses are leaving the engine, they run through tubes into the exhaust pipe. These tubes, are the headers. Now, if the air meeting at the end of the header is not equal to each amount being put through the other tubes, you get turbulance. Pressure will rise higher on on cylinder than on the others. Since not al lthe exhaust or air can escape at the same rate, you wont get new air/fuel into one of those cylinders to match the other cylinders. This is what we call "backpressure". Becase you arent getting as much fresh new air and fuel into that one cylinder as you possibly could, you get hesitation, and power drop.

Also, the more air and fuel you can push into your engine creates more power. The more you put in, the more you put out. In order to match whats going in, you need to match what is leaving your engine. Say you have 1200 Cubic centimeters of air and fuel going in on a factory engine, but you increase you air/fuel by 500 more centimeters. Your factory exhaust is set up for 1200 Cubic centimeters o exhaust to flow out. But with the increase of fuel and air, it can not allow as much going out. Headers wil allow the additoanl amounts to go out faster, and with equal pressure!

Answer 2

They don't "Replace" the exhaust manifold, they attach to them... How does this process effect velocity and more airflow? Think of it as your thumb partially covering the end of a garden hose. If the header is too small, it'll create a back pressure and the cylinder won't be able to effectively discharge the gases having been burned in your power stroke. If the cylinder hasn't been evacuated, then less fuel/air mixture will be allowed in the chamber. Get the picture? As things progress (or digress depending upon one's perspective) all of these flows are regualted by various sensors and computer chips. These include things such as the Mass Ariflow Sensor, the Crankshaft sensor, etc., etc., etc... It relly becomes an ugly picture when it comes to diagnosing and trouble shooting. Even if you've been trained and have the proper equipment.

Answer 3

The better an internal combustion engine can "breath" the better it can perform. There is no direct relationship between the replacement of headers and "Speed" per say, but fuel efficiency and horsepower, etc. (possibly leading to more "speed"). The same goes for any sort of intake, becuase then you're feeding the engine more fresh air, and getting rid of the exhuast more efficiently with the headers. You want an analogy? Try breathing for a few minutes through one of those "Fun Straws" with all of the twists and turns, then try exhaling through straight straw with a wider diameter, less bends, etc.

Answer 4

Headers do replace the exhaust manifolds to increase the exhaust flow out of the engine. The faster the spent gases get out of the engine the faster more fuel can burn in the engine. This increases horsepower.. Most header manufactures estimate that by installing headers you increase overall horsepower by up to 28%..

Answer 5

i own a repair shop,and i,ll try and explain it,,headers as you know do take the place of the factory exhaust,,but there tubed as to where a factory exhaust isn't,so each cylinder has a clear path to let off its exhaust fumes and back pressure,also there large in diameter,and this make it easier for the exhaust leave the engine quicker,which allows greater air flow,and creates more horse power,and helps generate more torque,,when you combine all of this it usually give a typical engine20-30 more horse power,because it doesn't have anything restricting the air flow,and that's pretty much how they work,the car can simply breath better,,good luck i Hope this help,s,,and have a good thanksgiving.

Answer 6

It relieves the back pressure at the cylender head and allows the exhaust gasses to be pushed out of the engine easier. Take a deep breath and hold your hand over your mouth and nose and try to exhale. Remove your hand and exhale. This is how a headder works. It will allow a few more horsepower from the engine which may increase your speed or pulling power by allowing your engine to exhale easier.

Answer 7

New after market headers are usually polished and have bigger exit ports than regular headers. This usually translates to more horse power by creating less back pressure, And also can change the exhaust tone when grouped with a different muffler or glass pack muffler.

Answer 8

particular this is the 1st area of the exhaust...we call it the exhaust manifold...it collects the exhaust gasses from the top and brings them jointly and routes them into the main significant exhaust device. a stable Header works effectively and might advance overall performance.