2. The Role of Cylinder Geometry on Thermo- mechanical Process in I.C. Engines-1 P M V Subbarao Professor Mechanical Engineering Department Geometry is an Universal Solution of All the Issues….

3. The Geometrical Description of Engine Cylinder

4. Selection of Cylinder Geometry B/L= 1.4 B/L= 1.0B/L= 0.7

5. The Kinematic Description of Engine Cylinder

6. Geometry of Cylinder : A Primary Signature An engine is described as a square engine when it has equal bore and stroke dimensions, giving a bore/stroke value of exactly 1. By custom, engines that have a bore/stroke ratio of between 0.95 and 1.04 can be considered "square". An engine is described as under-square or long-stroke if its cylinders have a smaller bore than its stroke - giving a ratio value of less than 0.95. An engine is described as over-square or short-stroke if its cylinders have a greater bore diameter than its stroke length, giving a bore/stroke ratio greater than 1.04.

7. Geometry must respect Heat Transfer: Else Get Extinct… Indian Elephant African Elephant Mammoths

8. Geometrical Features of Survived Non-biological Animals Bore – to –Stroke Ratio

9. Ability to Transfer Heat : A Signature of Survival

10. Geometrical Details at any Crank Angle Instantaneous volume of the Thermodynamic system Instantaneous Surface area of the Thermodynamic system For a given displacement volume, V d & squareness, R BS

11. Displacement Volume at Any Crank Angle

12. Relative location of piston center w.r.t. Crank Axis at any crank angle

13. Instantaneous Engine Cylinder Volume

14. Instantaneous Displacement Volume

15. Define Rod ratio