- 10,081
- WFG9
V6 Back Pressure, What about it?:
Subject : About Back Pressure
By : bob During the exhaust stroke, a good way for an engine to lose power is through back pressure. The exhaust valve(s) open at the beginning of the exhaust stroke, and then the piston pushes the exhaust gases out of the cylinder. If there is any amount of resistance that the piston has to push against to force the exhaust gases out, power is wasted. Using two exhaust valves rather than one improves the flow by making the hole that the exhaust gases travel through larger.
In a normal engine, once the exhaust gases exit the cylinder they end up in the exhaust manifold. In a 4-cylinder or 8-cylinder engine there are 4 cylinders using the same manifold. From the manifold the exhaust gases flow into one pipe toward the catalytic converter and the muffler. It turns out that the manifold can be an important source of back pressure because exhaust gases from one cylinder build up pressure in the manifold that affects the next cylinder that uses the manifold.
The idea behind an exhaust header is to eliminate the manifold's back pressure. Instead of a common manifold that all of the cylinders share, each cylinder gets its own exhaust pipe. These pipes come together in a larger pipe called the collector. The individual pipes are cut and bent so that each one is the same length as the others. By making them the same length, it guarantees that each cylinder's exhaust gases arrive in the collector spaced out equally so there is no back pressure generated by the cylinders sharing the collector.
Stating all of this, the v6 Camaro does need some back pressure as it helps with torque. Think of it as a water hose that you have bent in half, the pressure builds and creates a propulsion when it escapes, its sort of the same with torque but not really. The less back pressure the easier it is for the engine however less back pressure may also affect your low end slightly but it only changes the curve just as most performance products do.
About Bob:
I am a computer security/telephony security/network engineer
yes I am a knowledge freak and do a lot of reading on things I have interest in. Glad the posts helped
What is Torque?:
Subject : torque
By : bob
A car engine creates torque, and uses it to spin the crankshaft. This torque is created exactly the same way; a force is applied at a distance.
The combustion of gas in the cylinder creates pressure against the piston. That pressure creates a force on the piston that pushes it down. The force is transmitted from the piston to the connecting rod, and from the connecting rod into the crankshaft. the point where the connecting rod attaches to the crank shaft is some distance from the center of the shaft. The horizontal distance changes as the crankshaft spins, so the torque also changes, since torque equals force multiplied by distance.
You might be wondering why only the horizontal distance is important in determining the torque in this engine.
when the piston is at the top of its stroke, the connecting rod points straight down at the center of the crankshaft. No torque is generated in this position, because only the force that acts on the lever in a direction perpendicular to the lever generates a torque.
If you have ever tried to loosen really tight lug nuts on your car, you know a good way to make a lot of torque is to position the wrench so that it is horizontal, and then stand on the end of the wrench -- this way you are applying all of your weight at a distance equal to the length of the wrench. If you were to position the wrench with the handle pointing straight up, and then stand on the top of the handle (assuming you could keep your balance), you would have no chance of loosening the lug nut. You might as well stand directly on the lug nut.
Dr. F-Body Explains - RTV Sealants:
Sealants:
RTV sealant is one of the most widely used gasket compounds made from silicone, RTV is air curing, it seals, bonds, waterproofs, fills surface irregularities, remains flexible, doesn't shrink, is relatively easy to remove, and is used as a supplementary sealer with almost all low and medium temperature gaskets. It is available in RTV Blue up to 600*F and RTV Black up to 1000*F.
Subject : About Back Pressure
By : bob During the exhaust stroke, a good way for an engine to lose power is through back pressure. The exhaust valve(s) open at the beginning of the exhaust stroke, and then the piston pushes the exhaust gases out of the cylinder. If there is any amount of resistance that the piston has to push against to force the exhaust gases out, power is wasted. Using two exhaust valves rather than one improves the flow by making the hole that the exhaust gases travel through larger.
In a normal engine, once the exhaust gases exit the cylinder they end up in the exhaust manifold. In a 4-cylinder or 8-cylinder engine there are 4 cylinders using the same manifold. From the manifold the exhaust gases flow into one pipe toward the catalytic converter and the muffler. It turns out that the manifold can be an important source of back pressure because exhaust gases from one cylinder build up pressure in the manifold that affects the next cylinder that uses the manifold.
The idea behind an exhaust header is to eliminate the manifold's back pressure. Instead of a common manifold that all of the cylinders share, each cylinder gets its own exhaust pipe. These pipes come together in a larger pipe called the collector. The individual pipes are cut and bent so that each one is the same length as the others. By making them the same length, it guarantees that each cylinder's exhaust gases arrive in the collector spaced out equally so there is no back pressure generated by the cylinders sharing the collector.
Stating all of this, the v6 Camaro does need some back pressure as it helps with torque. Think of it as a water hose that you have bent in half, the pressure builds and creates a propulsion when it escapes, its sort of the same with torque but not really. The less back pressure the easier it is for the engine however less back pressure may also affect your low end slightly but it only changes the curve just as most performance products do.
About Bob:
I am a computer security/telephony security/network engineer
yes I am a knowledge freak and do a lot of reading on things I have interest in. Glad the posts helped
What is Torque?:
Subject : torque
By : bob
A car engine creates torque, and uses it to spin the crankshaft. This torque is created exactly the same way; a force is applied at a distance.
The combustion of gas in the cylinder creates pressure against the piston. That pressure creates a force on the piston that pushes it down. The force is transmitted from the piston to the connecting rod, and from the connecting rod into the crankshaft. the point where the connecting rod attaches to the crank shaft is some distance from the center of the shaft. The horizontal distance changes as the crankshaft spins, so the torque also changes, since torque equals force multiplied by distance.
You might be wondering why only the horizontal distance is important in determining the torque in this engine.
when the piston is at the top of its stroke, the connecting rod points straight down at the center of the crankshaft. No torque is generated in this position, because only the force that acts on the lever in a direction perpendicular to the lever generates a torque.
If you have ever tried to loosen really tight lug nuts on your car, you know a good way to make a lot of torque is to position the wrench so that it is horizontal, and then stand on the end of the wrench -- this way you are applying all of your weight at a distance equal to the length of the wrench. If you were to position the wrench with the handle pointing straight up, and then stand on the top of the handle (assuming you could keep your balance), you would have no chance of loosening the lug nut. You might as well stand directly on the lug nut.
Dr. F-Body Explains - RTV Sealants:
Sealants:
RTV sealant is one of the most widely used gasket compounds made from silicone, RTV is air curing, it seals, bonds, waterproofs, fills surface irregularities, remains flexible, doesn't shrink, is relatively easy to remove, and is used as a supplementary sealer with almost all low and medium temperature gaskets. It is available in RTV Blue up to 600*F and RTV Black up to 1000*F.
