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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
Video Braking Distance
Video Braking Period
Video CO2 emission
Video Density
Video Torque
Video Pressure
Video Injection Quatity
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.
Video Hydraulic Ratio
Video Capacity
Video Piston Speed
Video Piston Force
Video Force
Video Crank Mechan. Forces
Video Fuel Consumption 1
Video Fuel Consumption 2
Video Fuel Consumption 3
Video Ciruit Area
Video Circuit Ring
Video Circumference
Video Clutch Pedal
Video Power (mechanical)
Video Power (effective)
Video Power (indicated)
Video Efficiency Weight
Video Wire Resistance
Video Steering Ratio
Video Volumetric Efficiency
Video Air Ratio
Video Venturi
Video Air Resistance
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

          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Formulary Stroke to Bore Ratio


Short stroke, square designed, long-stroke

The stroke length is compared with the bore diameter. This stroke-bore ratio has an influence on the operational behaviour of the engine. Whereas the short-stroke engine (left picture) has less stroke than bore, with the long-stroke engine this is (right picture) the other way around. If bore and stroke are approximately the same, one then speaks of an over-square engine.

Especially short-stroke engines in Formula 1

Whereas long-stroke engines provide more torque in the lower RPM range, short-stroke engines are more capable of particularly high revs and large valve openings. An extreme example is the current (2007) Formula 1 engine being a 2,4 Liter-V8 and with about 98 mm of bore and a 40 mm stroke-length.The latter ensures the fact that the average piston speed, despite the maximum RPM of 19.000 1/min, does not increase the average piston speed much more than 25 m/s. In order to keep the weight of the pistons low, there is no oil ring, almost no piston shaft and a gudgeon pin, which is much shorter and found directly under the piston crown.

s/d =
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2001-2014 Copyright programs, texts, animations, pictures: H. Huppertz - Email
Translator: Don Leslie - Email:
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s Piston stroke mm cm dm
d Piston diameter mm cm dm
s/d Ratio

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