What is a good lobe separation angle?

What is a good lobe separation angle?

Some engine specialists refer to it as that 106 sound—the NASCAR and short track oval sound where preferred lobe separation is usually specified between 104 and 106 degrees. The primary function of narrow lobe separation is to impel urgent acceleration off the turns when the throttle is opened.

How does LSA affect idle?

A wide LSA reduces valve overlap, softens the idle and improves overall drivability–especially on the street where performance engines benefit from 112 to 114 LSA. Nitrous engines, which make plenty of power and torque, often run wide lobe separation angles to moderate cylinder pressures and temperatures.

What is LSA on a car?

According to the Comp Cams catalog, “The lobe separation angle (LSA) is equal to 1/2 the angle in crankshaft degrees of rotation between the maximum exhaust valve lift and maximum intake lift.”

What is the difference between 114 LSA and 112 LSA?

A wider LSA figure (i.e. 114) moves the lobe centerlines further apart and will smooth your idle due to the decrease in overlap that it creates. The lower the figure (i.e. 112) moves the centerlines closer and will increase bottom end power, but your idle will suffer along with it.

How do you calculate lobe separation angle?

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).

What makes a cam choppy?

Its is true that the LSA has something to do with cam sound but its more about overlap more than anything. Overlap is the sole reason why a cam will “chop” or not. Sure, LSA can control overlap but its the mixture of duration and LSA that fully controls the amount of chop a cam has.

Does valve Lift affect idle?

LSA and Lift affect the “sound” and idle quality. Generally, smaller lobe separation angles cause an engine to produce more mid-range torque and high RPM power, and be more responsive, while larger lobe separation angles result in broader torque, improved idle characteristics, and more peak horsepower.

How much boost can a LSA handle?

The ZL1/CTS-V LSA superchargers installed on a factory 376 cubic inch LS is rated at 9lbs of boost. The 9lbs of boost is achieved using a 7.8″ crank pulley and a 2.95″ blower pulley.

Is the LSA a good engine?

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What does LSA mean for a cam?

Lobe-Separation Angle
What Is Lobe-Separation Angle? LSA is the distance from the centerline of the intake lobe to the centerline of exhaust lobe. It is the average centerline between both lobes and expressed in degrees ranging from 95 on the extremely narrow/tight side to upward of 120 on the wide end.

What is lobe center angle?

First let us define the lobe centerline angle. In simplest terms it is the angle between the intake and exhaust lobe peaks. Notably, it is the only cam attribute described in camshaft degrees rather than crankshaft degrees. Generally speaking, the majority of cams fall between 98 and 120 degrees LCA.

What is the camshaft lobe separation angle ( LSA )?

Five-hundred cubic inch NHRA Pro Stock engines in 2015 that revved to 11,000rpm operated on 116 degrees LSA and 800-plus cu in Pro Stock Mountain Motors 120 to 122. 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.

What happens when you change the lobe separation angle?

“Changing the lobe separation angle,” says Doug Patton of Pro Line Race Engines, “changes the amount of overlap that exists during the time the intake and exhaust valves are both open. 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 lobe separation angle in NHRA?

Five-hundred cubic inch NHRA Pro Stock engines that rev to 11,000rpm operate on 116 degrees and 800-plus cu in Pro Stock Mountain Motors 120 to 122. 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.

What’s the lobe separation angle on a 350cu?

A 350cu in oval track racing engine, for example, often runs on a narrow lobe separation angle of 106 degrees. In contrast, a smooth-running high-performance street engine might use a lobe separation angle of 112 to 114 degrees.