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Old 08 Mar 2009, 09:46 pm
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Default What is a "head" in a car engine?

What is a "head" in a car engine? What does porting and polishing a head mean?
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Old 08 Mar 2009, 10:01 pm
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The part that contains valve trains,spark plugs and combustion chambers.Those mean to clean it up thoroughly.
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Old 08 Mar 2009, 10:16 pm
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To put it in as simple form as possible it is: You have and engine block which houses your pistons. It is the pistons that actually drive the engine crank that transfers energy to your transmission. The "heads" as you put it sit on top of the block. The heads consist of at a minimum of 2 ports per piston. One for the fuel air mixture and one for the exhaust. Timining in an engine is set such that on every other stroke of the piston the engine is exhausting or combusting. When the piston 1 is beginnning at the top of the stroke a port(or valve) is opened(this is in the head) which allows the fuel air mixture into the piston chamber. When timing is correct the spark from the spark plug ignites the mixture which drives the piston down. The port is then closed. When the piston comes up again the the other port opens which allows the combusted materials(exhaust) to exit the chamber. The idea behind porting and polishing had to do with having the area in the head that gases enter and exit the chamber are clean and smooth. Typically, porting is done if your increasing the size of the valve seat area. After a lot of mileage the flow of gases tends to wear out the seats(They don't stop the gases, they seep through....very inefficient) of the valves and in order to be efficient larger valves are installed. Or in the case of racing/high performance you may want greater fuel/air delivery and exhausting capability. This would in effect raise the rpm of the engine. Polish is what it sounds like. Make the metal smooth. This allows the gases to pass quicker(less friction) which allows for a more efficient engine.
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Old 08 Mar 2009, 10:31 pm
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The head holds the valves and some times a cam shaft if it is a overhead cam. the air fuel mixture enters the head from the intake manifold and at the right time the intake valve opens in the head to allow the air fuel mixture into the cylinder. then the exhaust valve opens on the exhaust stroke to allow exhaust to be moved out to the exhaust manifold. porting the head is when you grind down any rough castings in the intake and exhaust ports from when the head was made. polishing the ports allows the air fuel mixture to move more quickly in and out of the cylinder and it also allows the fuel to atomize more before it reaches the cylinder
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Old 08 Mar 2009, 10:46 pm
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short for a cylinder head.
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Old 08 Mar 2009, 11:01 pm
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All of the above are correct. Simplified the head tops the block the way your head tops your body
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