Post by Deleted on Mar 6, 2017 12:46:30 GMT 10
Cylinder head/intake/exhaust porting refers to the process of modifying the intake/combustion/exhaust ports of an engine to improve the quantity and efficiency of combustion and removal of the air and exhaust gas flow.
Cylinder heads are usually sub-optimal due to design (SMOG) and manufacturing constraints. Porting the heads provides/intake/combustion chamber and exhaust are finite details required to bring engines to the highest level of efficiency. If an engine (like a mammal/human) cant breath in clean oxygen rich air and breath out the toxic gasses it will not perform at its peak.
The porting process can be applied to all engine types to optimize power output, enhancing its power for daily use or to specifically alter its power output to suit a particular racing or performance application. This is a factor in why 2 stroke engines utilize power valves, which are really just movable exhaust port gates which close at low rpm and open at high RPM to allow power pulses and exhaust to escape.
The air we breath and pay little attention to as mammals/humans is a vital element in all engines attempting to generate power. In an engine, the intake, combustion and exhaust cycle, the air can behave in several ways (thick, thin, sticky, elastic and turbulent).
Cold air is denser, oxygen rich and helps maintain even combustion temperatures. All engine perform noticeably better on cool or cold days. The other side of the spectrum is high altitude where air is thin (less oxygen) therefore inefficient in combustion without alteration to allow more air. Hot days, the air is thinner (less oxygen) and is inefficient.
Porting is vital as an engine is really nothing more than a pump. It must be able to pump in as much air and fuel as possible that can be burned efficiently. Pumping air it is a problem for engines running at speed due to restrictive porting, turbulence, altitude so head, intake, fuel and exhaust porting are vital in order to allow greater volume to move in and out of the engine.
For an analogy, a 3/4" pipe 6 feet long can hold X volume of air. In order to fill it with more air, increased pressure is needed (supercharger, turbo - expensive and generates heat). An easier and more efficient method is to toss the 3/4" pipe and upgrade to a 1" pipe which can hold XY more air without the need to pressurize it and the additional heat of the pressurization system is no longer a factor.
Just some basics.........food for thought.
Best as always,
DG
Cylinder heads are usually sub-optimal due to design (SMOG) and manufacturing constraints. Porting the heads provides/intake/combustion chamber and exhaust are finite details required to bring engines to the highest level of efficiency. If an engine (like a mammal/human) cant breath in clean oxygen rich air and breath out the toxic gasses it will not perform at its peak.
The porting process can be applied to all engine types to optimize power output, enhancing its power for daily use or to specifically alter its power output to suit a particular racing or performance application. This is a factor in why 2 stroke engines utilize power valves, which are really just movable exhaust port gates which close at low rpm and open at high RPM to allow power pulses and exhaust to escape.
The air we breath and pay little attention to as mammals/humans is a vital element in all engines attempting to generate power. In an engine, the intake, combustion and exhaust cycle, the air can behave in several ways (thick, thin, sticky, elastic and turbulent).
Cold air is denser, oxygen rich and helps maintain even combustion temperatures. All engine perform noticeably better on cool or cold days. The other side of the spectrum is high altitude where air is thin (less oxygen) therefore inefficient in combustion without alteration to allow more air. Hot days, the air is thinner (less oxygen) and is inefficient.
Porting is vital as an engine is really nothing more than a pump. It must be able to pump in as much air and fuel as possible that can be burned efficiently. Pumping air it is a problem for engines running at speed due to restrictive porting, turbulence, altitude so head, intake, fuel and exhaust porting are vital in order to allow greater volume to move in and out of the engine.
For an analogy, a 3/4" pipe 6 feet long can hold X volume of air. In order to fill it with more air, increased pressure is needed (supercharger, turbo - expensive and generates heat). An easier and more efficient method is to toss the 3/4" pipe and upgrade to a 1" pipe which can hold XY more air without the need to pressurize it and the additional heat of the pressurization system is no longer a factor.
Just some basics.........food for thought.
Best as always,
DG
