Chapter174Valveeventscamterm

Chapter174Valveeventscamterm - Performance engine...

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Performance engine preparation Valve events What are they? How are they measured? Which cam lobe leads the other?
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Performance engine preparation Valve events IVC (Intake valve closing) Determines effective compression ratio Early – High cylinder pressure, detonation Late – Low cylinder pressure, intake reversion Piston direction @ IVC ? Occurs after BDC to take advantage of inertia
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Performance engine preparation Valve events EVO (Exhaust valve opening) End of power stroke Early – Shortened power stroke, lower output Late – Incomplete evacuation, more effort required to remove exhaust gas (pumping loss) Piston direction @ EVO ? “Blow down” is between EVO & BDC
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Valve events IVO (Intake valve opening) Early – Exhaust gas dilutes intake Late – Piston direction @ IVO ? Ideal – Cylinder & manifold pressures are equal
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This note was uploaded on 01/06/2012 for the course AUTO 94 taught by Professor Davecapitolo during the Fall '03 term at DeAnza College.

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Chapter174Valveeventscamterm - Performance engine...

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