How do you calculate cam specs?

How do you calculate cam specs?

Take your digital caliper and measure the smallest diameter on the cam. This is called the base circle. This cam measured at 1.10 inches and 87 thousandths. The next value you will need is the largest diameter on the cam, the lobe part, which is called the base circle and lobe lift.

How is camshaft LSA calculated?

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 is the formula for calculating overlap?

Overlap = min(A2, B2) – max(A1, B1) + 1. In other words, the overlap of two integer intervals is a difference between the minimum value of the two upper boundaries and the maximum value of the two lower boundaries, plus 1.

What does +2 mean on cam LSA?

The + 2 or + 4 designation after the LSA is the amount of advance ground into the cam if it was installed straight up. This will effect the intake centerline like you stated. Neal.

What gives a cam a choppy idle?

Registered. LSA (lobe separation angle) determines the choppiness, it has to do with the overlap of when both valves are open, as in when the exhaust valve is closing and the intake valve is opening to pull fresh fuel in on the intake stroke after pushing out the burnt fuel. Most GM cams come on a 112, 114 or 116 LSA.

How do you calculate cam angle?

The pressure angle, which is the reciprocal of the transmission angle m (i.e. a=p/2-m ) is defined as: In cams there is point contact between the two profiles. The force is transmitted along the common normal of the two contacting curves.

How do you calculate overlap in steel?

Lapping of reinforcement is usually done where minimum bending stress is required. In general, lap length is 50d which means 50 times the bar diameter is provided if both bars are of same diameter. For flexural tension – Ld or 30d whichever is greater is considered.

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.

What makes a cam lope lift or duration?

Lope is a result of the intake and exhaust valves both being open at the same time. This is called overlap. Mild cams have little or no overlap at any valve opening that makes a difference. Hotter aftermarket type cams have a lot because it aids high RPM breathing.