What does camshaft lobe separation do?
What does camshaft lobe separation do?
The primary function of narrow lobe separation is to impel urgent acceleration off the turns when the throttle is opened. A wider LSA, on the other hand, reduces valve overlap, offering better idle and cruising qualities.
How is lobe separation calculated?
Cam Lobe Separation Lobe separation can be measured using a dial indicator and a degree wheel, but is usually calculated by dividing the sum of the intake centerline and the exhaust centerline by two.
What causes a cam to lope?
the lope comes from what is effectively(in engine combustion terms) an overlap between one cylinder opening and another closing. These cams are designed to maximize the engine combustion cycle at very high RPMS with VERY large and Very Dense fuel air mixtures.
Can you use 108 lobe separation for supercharging?
But often the existing camshaft works surprisingly well, and those with lobe separation angles of between 112 to 116 degrees are ideal. Generally, naturally aspirated engines run narrower lobe separation angles of around 106 to 108 whereas supercharged, turbo or nitrous engines operate with 112 to 114 and higher.
How do I calculate my LSA cam?
To check your LSA you calculate it by adding the intake and exhaust Lobe Centerline figures together and dividing their sum by two (Ex: 112 intake Centerline + 116 exhaust Centerline = 228 / 2 = 114-degree LOBE SEPARATION ANGLE).
How is cam lift calculated?
Simply measuring the diameter of the base circle, and subtracting that from the largest diameter of the cam, the lobe lift, will calculate the lift of the cam.
How is LSA calculated?
How does LSA affect torque?
Narrower LSA: Moves torque to lower rpm. Increases maximum torque. Narrow powerband. Increase chance of engine knock.
What is a loping idle?
We say an engine “lopes” or “surges” at idle when RPMs cycle unsteadily up and down. For example, a car may surge at idle between 600 and 1000 rpm.
What does lobe separation do for a cam?
The lobe separation angle or LSA is the angle in camshaft degrees between the maximum lift points, or centerlines, of the intake and exhaust lobes. It affects the amount of valve overlap; that is the brief period of time when both the intake and exhaust valves are open.
What does lobe separation do?
Lobe separation, or lobe separation angle, is the distance (in camshaft degrees) that the intake and exhaust lobe centerlines are spread apart. This separation determines where peak torque will occur within the engine’s power range and also has an effect on idle quality and engine vacuum.
What are the parts of a camshaft lobe?
A remanufacturer will use a CNC grinder to grind down the lobes of the camshaft to ensure they provide the proper lift that is required for the engine. There are two basic parts to a lobe: the base circle and the lift. When a lobe is worn, it is usually worn on the lift.
