heads and cams
11-08-2006, 09:09 PM
#2
CSMG Moderator
Join Date: Mar 2006
Location: New Jersey
Posts: 3,503
RE: heads and cams
Air gets split evenly into each of your 8 cylinders by the runners in your intake manifold. That air, as well as atomized fuel from your injector, goes through your cylinder heads and into the combustion chamber by way of an intake valve. The camshaft (on your car) sits on top of cylinder heads and has gears at the end spun by a chain (timing chain). As they spin, the cam lobes open and close the intake and exhaust valves... Now that I read this over, I see ii's hard to explain. I think you can find something at www.howstuffworks.com.
11-08-2006, 11:14 PM
#6
3rd Gear Member
Join Date: Nov 2006
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Posts: 676
RE: heads and cams
in the heads, there are little valves, look like itybity pistons/plungers, and they rest in what is basically a tube, with 2 openings, one opening at the top, in which air goes in, from the intake manifold, and one at the bottom which air goes into the combustion chamber, there are also valves going from combust. to exhaust. your cams, as they rotate, open and close these valves.
the heads also supply a place in which the fuel can combust to force the piston back down and the next one up.
the numbers on the cam such as .560/.550 means that the cam moves the intake valves a total of .56 inches, and the exhaust valves .55 inches, the duration such as 232/232 is how long the valves are open, the longer they are open, the more air that can get into the system, if the lift is like .590 on one cam, and the other cam has .560, and both have a 232 duration, the .590 will let more air into the heads/combustion chamber.
i believe that's correct.
also, an NA cam will have a big *** lift, and really long durations, so as to get as much air as the motor can naturally pull, with forced induction however, if you keep the same cams, you need a smaller lift and shorter duration, as you are forcing air into the motor, it doesnt take as long for it to get into the chamber, so if you keep your NA cam, you are likley going to be putting way too much air into your motor if you just slap on a blower and call it a day.
the heads also supply a place in which the fuel can combust to force the piston back down and the next one up.
the numbers on the cam such as .560/.550 means that the cam moves the intake valves a total of .56 inches, and the exhaust valves .55 inches, the duration such as 232/232 is how long the valves are open, the longer they are open, the more air that can get into the system, if the lift is like .590 on one cam, and the other cam has .560, and both have a 232 duration, the .590 will let more air into the heads/combustion chamber.
i believe that's correct.
also, an NA cam will have a big *** lift, and really long durations, so as to get as much air as the motor can naturally pull, with forced induction however, if you keep the same cams, you need a smaller lift and shorter duration, as you are forcing air into the motor, it doesnt take as long for it to get into the chamber, so if you keep your NA cam, you are likley going to be putting way too much air into your motor if you just slap on a blower and call it a day.
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