What does it mean to widen the camshaft lobe separation angle?
What does it mean to widen the camshaft lobe separation angle?
If a street car has smaller lift (the amount the valve lifts off its valve seat) and duration numbers (the degrees of crankshaft rotation for which the valve is held open) they might run 112 or 114. Widening their separation angle helps increase upper rpm power output.
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.
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.
Why are the lobes of the cam and follower tapered?
In order to reduce wear at this point, the cam and follower are both surface hardened, and modern lubricant motor oils contain additives specifically to reduce sliding friction. The lobes of the camshaft are usually slightly tapered and the faces of the valve lifters slightly domed]
What happens when you change the camshaft lobe separation angle?
“Changing the lobe separation angle changes the amount of overlap that exists during the time the intake and exhaust valves are both open,” echoes Doug Patton of Pro Line Race Engines. “On a naturally aspirated engine, the lobe separation angle has an effect on whether the engine reaches peak torque a little earlier or later in the rpm range.
What is the angle between the intake and exhaust lobe of the cam?
This equals the angle between the exhaust lobe and the intake lobe on the cam if the intake and exhaust lifter bores are oriented at the same angle from vertical in the engine block.
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.
How can you tell if you have bad lobe on your camshaft?
First, because there’s no reason not to, and it’s probably easier to access the top of the cam lobes than the valves. Secondly, because engines with VTEC-comparable systems won’t show a flat secondary lobe at the valve when you’re turning the engine over by hand.
