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Go Back\Cancel=BUTTON_B
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[TEXT]
CAMSHAFT

Camshafts control the opening and closing of the valves. The camshaft is driven directly or indirectly (such as a belt or chain) off the crankshaft. The cams are connected either directly or through a mechanical connection (such as a pushrod) to the valve "lifter". The lifter can be set in a variety of ways. The shape of the cam is what determines when and how much a valve opens. The shape of the cam is determined by the following settings:

IVO-	The Intake Valve Opening event signals the beginning of the air flow into the cylinder. The value is in degrees before top dead center (BTDC) and has a range of 0 to 80 degrees.

IVC-	The Intake Valve Closing event is considered the most important cam timing and signals the end of the airflow into the cylinder. Earlier IVC helps low-end power. Late IVC increases high-speed performance. The value is in degrees after bottom dead center (ABDC) and has a range of 0 to 110 degrees.

EVO-	The Exhaust Valve Opening event signals the beginning of the exhaust flow out of the cylinder and is considered the second most important timing event. The value is in degrees before bottom dead center (BBDC) and has a range of 0 to 110 degrees.

EVC-	The Exhaust Valve Closing event signals the end of the exhaust flow out of the cylinder. The value is in degrees after top dead center (ATDC) and has a range of 0 to 80 degrees
Intake Lift-	This is a measure of the distance the cam "lifts" the intake valve. The range is .20 to 1.35. A higher lift opens the valves further, often improving engine performance.

Exhaust Lift-	This is a measure of the distance the cam "lifts" the exhaust valve. The range is .20 to 1.35. A higher lift opens the valves further, often improving engine performance.

Advance/retard-	This refers to the amount of advance or retard of the installed camshaft. The focus is on intake timing. Advancing the cam typically increases low-end performance. A retarded cam tends to help the top end. Advance/retard is measured in degrees and has a range of -15 to 15 degrees.

The player can set any of these settings or select a preset cam. This type of cam spec is called the seat-to-seat method. There is another method called the .050 lifter-rise spec that can be used by using a "calculator" built into the program.
