Explain to Me a cam
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03-28-2004, 10:29 PM
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03-28-2004, 10:31 PM
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#4
03-28-2004, 10:41 PM
#5
03-28-2004, 10:54 PM
Explain to Me a cam
Alright Ecej, bear with me.......Ok, the efficiency, HP, and Torque of an engine all has to do with how much air gets in and how much air gets out of an engine. Ok, remember that.
An aftermarket cam has higher "Lift", which is how much the valve opens. More "Lift" means the valves open more, letting in more air and fuel.
They also have longer "Duration", which is the amount of time the valve stays open (in degrees for rotation-like a 270 degree cam will keep the valve open at a said lift for 270 degrees of cam rotation), which will let in more air and fuel.
And you have overlap (also in degrees), which is when both intake and exhaust valves are open at the same time. That allows a "sucking" effect when the exhaust goes out to help draw more intake air into the cylinder.
Too much lift and overlap will give great high RPM power, but a weak low-end and a crappy idle. So, a cam with slightly more lift than stock would be good for trails, etc.
Does this help at all? I can try to explain things clearer if you would like.
An aftermarket cam has higher "Lift", which is how much the valve opens. More "Lift" means the valves open more, letting in more air and fuel.
They also have longer "Duration", which is the amount of time the valve stays open (in degrees for rotation-like a 270 degree cam will keep the valve open at a said lift for 270 degrees of cam rotation), which will let in more air and fuel.
And you have overlap (also in degrees), which is when both intake and exhaust valves are open at the same time. That allows a "sucking" effect when the exhaust goes out to help draw more intake air into the cylinder.
Too much lift and overlap will give great high RPM power, but a weak low-end and a crappy idle. So, a cam with slightly more lift than stock would be good for trails, etc.
Does this help at all? I can try to explain things clearer if you would like.
#6
03-28-2004, 11:11 PM
#7
03-28-2004, 11:27 PM
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#8
03-29-2004, 12:41 AM
Explain to Me a cam
Originally posted by: fasternu
Alright Ecej, bear with me.......Ok, the efficiency, HP, and Torque of an engine all has to do with how much air gets in and how much air gets out of an engine. Ok, remember that.
An aftermarket cam has higher "Lift", which is how much the valve opens. More "Lift" means the valves open more, letting in more air and fuel.
They also have longer "Duration", which is the amount of time the valve stays open (in degrees for rotation-like a 270 degree cam will keep the valve open at a said lift for 270 degrees of cam rotation), which will let in more air and fuel.
And you have overlap (also in degrees), which is when both intake and exhaust valves are open at the same time. That allows a "sucking" effect when the exhaust goes out to help draw more intake air into the cylinder.
Too much lift and overlap will give great high RPM power, but a weak low-end and a crappy idle. So, a cam with slightly more lift than stock would be good for trails, etc.
Does this help at all? I can try to explain things clearer if you would like.
Alright Ecej, bear with me.......Ok, the efficiency, HP, and Torque of an engine all has to do with how much air gets in and how much air gets out of an engine. Ok, remember that.
An aftermarket cam has higher "Lift", which is how much the valve opens. More "Lift" means the valves open more, letting in more air and fuel.
They also have longer "Duration", which is the amount of time the valve stays open (in degrees for rotation-like a 270 degree cam will keep the valve open at a said lift for 270 degrees of cam rotation), which will let in more air and fuel.
And you have overlap (also in degrees), which is when both intake and exhaust valves are open at the same time. That allows a "sucking" effect when the exhaust goes out to help draw more intake air into the cylinder.
Too much lift and overlap will give great high RPM power, but a weak low-end and a crappy idle. So, a cam with slightly more lift than stock would be good for trails, etc.
Does this help at all? I can try to explain things clearer if you would like.
#9
03-29-2004, 12:42 AM
#10
03-29-2004, 08:13 AM
Explain to Me a cam
be ware, the larger the cam, the higher octain you'll have to run, to an extent