What does porting a cylinder head do?
Cylinder head porting refers to the process of modifying the intake and exhaust ports of an internal combustion engine to improve their air flow. Cylinder heads, as manufactured, are usually suboptimal for racing applications due to being designed for maximum durability.
What is the highest point of piston travel?
When the piston is at its highest position in the cylinder, it’s said to be at top dead center (TDC). Inside the cylinder, the space above the piston is called the combustion chamber. In the combustion chamber, a mixture of air and fuel is burned to produce power.
What is a gas port in a rifle for?
Definition of gas port : a small hole in the barrel of a gas-operated rifle for allowing sufficient controlled escape of gas to insure proper functioning.
How much does it cost to port cylinder heads?
That could be a $1,000 question, if you go the fully ported route. On the low-end, you’re looking at around $200 for a professional three-angle valve job with the existing 1.94/1.50 valves. Add bowl-porting and a set of big valves and you move up into the $500-$700 range.
How much does it cost to get cylinder heads ported?
Why are gas ported Pistons not allowed?
Gas ported pistons requires extra machining, which equates to more expense. One of the weakest areas of a piston is the valve relief area and adding ports to the top of the piston can weaken the area along with ring land itself. There are also a number of race classes that do not allow gas porting of the pistons.
What are gas-ported piston rings used for?
Gas-ported piston rings are the answer for racers when a gas-ported piston isn’t legal for the class they compete in. These types of rings can have a positive effect on blow-by inside the cylinder and create an opportunity for more efficient horsepower to be generated.
What is the most efficient gas port on a piston?
Vertical gas ports offer the most efficient approach since the holes are drilled directly from the piston top into the back side of the top ring land.
What is a lateral gas port on a piston?
Lateral gas ports are often found on pistons intended for circle track racing. An easy way to identify a JE piston that offers lateral gas ports, for example, is to look for the GP initials in the piston description. Examples include the big-block Chevy, open chamber lightweight FSR GP piston.