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Engine DesignMOT/COMOT-E

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Who should attend?

  • This course provides participants a deeper knowledge & competencies to design and use dimensioning criteria of reciprocating piston engines, particularly those for automotive applications.
Audience :
  • Engineers and technical staff involved in the field of engines who wish to be in a position to make technical choices and components dimensioning.

Level : Advanced

Course Content

  • Architecture options

      • Specifications of a new engine.
      • Determining the main dimensions: bore, stroke, cylinder spacing, depending on the specifications: MEP characteristics and piston mean velocity on engines of the same range.
      • Global design process of mobile coupling system, crankcase-cylinders, cylinder head, timing.

  • Mobile parts dimensioning

      • Kinematics and dynamics of the mobile parts.
      • Choosing the conrod spacing. Conrod swept volume. Calculation of stresses in the links.
      • Functions to be performed by the piston and the rings. Dimensioning of the pin and the bosses.
      • Bushing dimensioning.
      • Conrod: ring and bushing shrink fitting, resistance to fatigue and buckling, connecting rod screws dimensioning.
      • Crankshaft: shape depending on the cylinders number, material, counterweight, stresses, crank pin pre-dimensioning method, dowels, crank web, lubrication system.
      • Balancing and dimensioning of the balancing shafts for an inline-four engine.

  • Crankcase-cylinders & lower crankcase

      • Crankcase-cylinders functions and stresses.
      • Choosing the engine bottom material and architecture.
      • Building the conrod chamber. Determining the crankcase height. Choosing water circulation.
      • Oil circuits, oil returns, blow-by chimneys.
      • Timing face, coupling face, side faces.

  • Cylinder head

      • Cylinder head functions. General choices of cylinder head architecture. Material. Definition of bore spacing: setting the clamps, the injector, the valves, the timing control.
      • Intake and exhaust pipes. Water core, oil core. Lubrication system. Processing constraints.
      • Calculation of cylinder head pillar pre-dimensioning.
      • Failure modes. Validation.

  • Timing

      • Valve control and timing drive technologies.
      • Valves, valve guide and seats, wedges, springs.
      • Timing diagram, path section. Determining the lift law. Margin to valve hunting. Dimensioning criteria: stresses, Hertz pressure, wear, noise. Cam drive torque.
      • Calculation exercise of a cam on tappet symmetric lift law. Calculation codes, modeling.
      • Variable timing system.

Learning Objectives

  • Upon completion of the course, participants will be able to:
  • choose the architectures of a new engine at pre-project stage: cubic inch displacement, bore-stroke ratio, cylinder head and block structures, timing drive,
  • select and use the adequate criteria to develop the cam laws,
  • use the main rules applied to block and cylinder head design,
  • choose materials for the main engine components and explain their selection.

Ways & Means

  • Many applicative examples of the real life, dimensioning exercises managed by learners, focused cases study.