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Video Cylinder - Crank Drive
Video Piston 1
Video Piston 2
Video Piston 3
Video Piston 4
Video Piston - history
Video Piston - in general
Video Piston - material
Video Piston - stress
Video Piston - dimensions
Video Piston - measuring
Video Piston - truck
Video Piston Pin
Video Piston Pin Offset
Video Piston Rings 1
Video Piston Rings 2
Video Piston Rings 3
Video Connecting Rod
Video Crankshaft-history
Video Crankshaft 1
Video Crankshaft 2
Video Crankshaft 3
Video Crankshaft 4
Video Crankshaft 5
Video V-2 Crankshaft 6
Video Crankshaft 7
Video Bearing Play Check
Video Forces crank mechanism
Video Rot. Vibration Damper
Video Equaliser Shafts 1
Video Equaliser Shafts 2
Video 5-cyl. Block
Video Fly Wheel
Video Cylinder Block 1
Video Cylinder Block 2
Video Cylinder Block 3
Video Cylinder Block 4
Video Cylinder Block 5
Video Cylinder Block 6
Video Measurements
Video Loop Scavenging
Video Classic Racing Engine
Video V8 Cylinder Block
Video V8 Crankshaft 1
Video V8 Crankshaft 2
Video V10 Cylinder Block
Video V12 Cylinder Block
Video W12 Cylinder Block
Video W8 Cylinder Block

Video CO2-Emissions
Video Torque
Video Gas Speed
Video Hollow Cylinder
Video Bore Stroke Ratio
Video Cubic Capacity
Video Output per Liter
Video Efficiency
Video Calc. Crank Mechan.
Video Pistin Force
Video Compression Ratio
Video Pistin Speed
Video Power (output)
Video Power (piston pressure)

Video Multi-cylinder engine 1
Video Multi-cylinder engine 10

          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

Piston Dimensions

Parts and dimensions
1Piston crown
2Piston skirt
3Top land
4Piston-ring zone
5Compression height
6Piston height

Appropriate micrometer accurate to 1/100th of a millimeter

The piston is a relatively complicated component to measure because of it's oval shape and the resulting changes when being heated. It's diameter can be measured using a micrometer with an accuracy of between 0,05 to 0,01 mm. A micrometer for pistons having a diameter of 75 - 100 mm is shown in the above pictures 2 and 3. With each full rotation of the sleeve (50 division lines), the spindle moves 0,5 mm on the scale of 75 - 100 mm.

Clearance between the piston and the cylinder-wall in a cold engine
Heat land in the direction of the piston pin axle0,21 mm
Heat land at 90 to the piston pin axle0,23
Top of the piston skirt in the direction of the piston pin axle0,2 mm
Top of the piston skirt at 90 to the piston pin axle0,1 mm
Bottom of the piston skirt in the direction of the piston pin0,1 mm
Bottom of the piston skirt at 90 to the piston pin axle0,05 mm

Cold-measuring at 90 to the piston pin axle at the bottom of the piston skirt

The compression height is the most important dimension of the piston. It is one of the factors determining the total height of the engine. Because 80% of the pistons mass is found in the area of the compression height, it influences the design and also the weight of the piston. A different value here of course, also changes the compression ratio of the piston engine. 07/11               Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

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