What does changing cam timing do?
A Basic Overview of Cam Timing Advancing or retarding the cam pushes the centerline of the camshaft to one side or the other of the crankshaft centerline. This changes the Timing of the valve opening and closing events, in relation to the position of the piston in the cylinder.
How can cam timing be checked?
Begin with the intake valve; slowly turn the crank clockwise until the lifter rises 0.050 inch. Stop turning the crank and read the degree wheel. This begins duration at 0.050 inch. If our cam card says the intake valve opens at 31 degrees BTDC, the degree wheel should show 31 degrees BTDC at this time.
How do you know the timing of the camshaft?
Camshaft Timing. Begin as you did before with a dial indicator on the lobe of the cam. This time, however, position the cam so the dial indicator is sitting on the base circle (zero lift) and zero out the dial. Rotate the engine in the normal direction of rotation until you have 0.050 lift and look at your degree wheel.
How are camshafts measured in Summit Racing Cars?
Summit Racing’s got a handy camshaft timing calculator that can help you determine the right cam specs for your performance needs. This simple upward movement of the cam lobe can be measured in terms of inches (or millimeters) of lobe lift.
How does cam timing and lobe separation angle affect engine?
Knowing how these things affect engine operation can help you in the engine planning stages if you want to leave some tuning leeway in your cam selection. Our thanks to Comp Cams for providing this easy to use reference guide for our readers.
How is lobe lift measured on a cam card?
Reading a Cam Card: Lobe Lift This simple upward movement of the cam lobe can be measured in terms of inches (or millimeters) of lobe lift. On our sample Summit Racing Pro LS cam card above, the first line is called Lift and is detailed as either intake or exhaust lobe lift at the camshaft.