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Video Formulary

Video Generally
Video Axle Load Distribution
Video Payload Distribution
Video Braking Distance
Video Driving Force
Video Work/Energy
Video Radian Measure
Video Tension (brake)
Video Brake Force
Video Brake Pedal
Video Brake Force (wheel)
Video De-/Acceleration
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Video Braking Period
Video CO2 emission
Video Density
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Video Electrical Power
Video Riding Speed
Video Centrifugal Force
Video Gas Speed
Video Speed
Video Coaxial Gearbox
Video Lever Ratio
Video Hollow Cylinder
Video Stroke-bore Ratio
Video Displacement
Video Power Output p.l.
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Video Capacity
Video Piston Speed
Video Piston Force
Video Force
Video Crank Mechan. Forces
Video Fuel Consumption 1
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Video Fuel Consumption 3
Video Ciruit Area
Video Circuit Ring
Video Circumference
Video Clutch Pedal
Video Power (mechanical)
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Video Power (indicated)
Video Efficiency Weight
Video Wire Resistance
Video Steering Ratio
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Video Air Ratio
Video Venturi
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Video Parallel Circuit
Video Planetary Gearbox
Video Percent
Video Rectangle
Video Rectangle Column
Video Friction Force
Video Tyre Calculation
Video Serial Circuit
Video Rolling Resistance
Video Cam Dwell
Video Dwell Period
Video Slip
Video Spread of Gears
Video Climbing Resistance
Video Ratio
Video Circumference speed
Video Conversions
Video Not Coaxial Gearbox
Video Valve Opening Area
Video Valve Opening Angle
Video Valve Opening Period
Video Compression Ratio 1
Video Compression Ratio 2
Video Amount of Heat
Video Resistance
Video Efficiency
Video Cube
Video Ignition Interval
Video Cylinder

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Formulary Dwell Angle

Dwell-angle and number of cylinders in an ignition diagram with Hall effect control


Whereas the dwell angle was measured in distributor-shaft degrees, previously the contact breakers were closed as a switch in the primary circuit of the ignition coil. This is important, even without contact breakers, because it determines the period of the electric charge. If the period is too short, not enough ignition energy is available, should it be too long, then the ignition coil can overheat and, should it be fused, then the fuse can blow.

If the distributor shaft has the same number of cams as the engine has cylinders, and each cam has an opening- and closing angle, then the sum of the opening- and closing angles adds up to 360. The closing angle is always a percentage based on the amount of multiple cams that the engine has, thus, the sum of the opening- and closing angles. Therefore, in a four cylinder engine, an angle of 45 corresponds to a dwell-angle of 50%. 05/12

360 · %


100 · z

· 100 · z

% =


360 · %

z =

100 ·

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Dwell angle (grad)
z Number of cylinders
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Translator: Don Leslie - Email:

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