How do you calculate maximum valve lift?

Tip: Maximum valve lift can be calculated by multiplying the maximum lobe lift times the rocker ratio. For example, a 0.310″ lobe lift cam yields 0.496″ of valve lift when using a 1.6 ratio rocker arm.

How is valve clearance calculated?

Position the dial indicator on the top of the exhaust-valve retainer and zero the dial indicator. Next depress the exhaust valve. Note the distance traveled. Now subtract the difference in the gasket thicknesses and you should have an accurate measurement of the piston-to-valve clearance.

What determines the valve duration on a camshaft?

Camshaft Duration is the measurement of the time one valve begins to open until it finishes closing. Duration is measured in degrees of crankshaft rotation, not camshaft rotation. You’ll see duration specifications at . 050 inches, the duration is measured from that point.

How does 1.6 rockers calculate valve lift?

You will need to know the Rocker Arm Ratio to calculate. of valve lift with a 1.6 rocker ratio. Valve Lift = 0.270 x 1.6 = 0.432 in. Example #2: A camshaft with 0.468 in.

How does TDC measure valve lift?

Go back to TDC and zero the exhaust dial-gauge. Rotate the engine *clockwise* until the exhaust gauge no longer moves (counting the revolutions on the gauge as you go). The difference in readings represents your lift at TDC.

How do you calculate valve shim clearance?

The equation you’ll use to determine the new shim size is as follows: New shim size = (measured valve clearance – specified valve clearance) + old shim size.

How do you calculate valve duration?

How is it measured?

1. Using a Dial Indicator and Degree Wheel, find the opening and closing points of the valves at 0.050 in. of lift. If the intake valve opens AFTER TDC, use a negative value. If the exhaust valve closes BEFORE TDC, use a negative value.
2. Add the numbers together.
3. Add 180° to find duration.

What is lift and duration on a camshaft?

Lift and duration are the primary factors that determine a cam’s profile. Lift is the amount a cam lobe actually moves a valve off its seat and is measured in fractions of an inch. Duration is the amount of time a cam keeps a valve off of its seat, measured in degrees of crank rotation.