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Chapter17Tumbleswirlpistonve

Chapter17Tumbleswirlpistonve - Performance engine...

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Performance engine preparation Tumble & swirl Tumble = In-cylinder air motion in “4-valve” heads Swirl = In-cylinder air motion in “2-valve” heads
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Performance engine preparation Tumble & swirl Purpose – More complete combustion at idle & low RPM Improves idle quality, part throttle driveability, & economy More volume & velocity across one side of the valve
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Performance engine preparation Tumble & swirl Tumble/swirl is induced by port angles, cylinder walls, & heart shaped chambers
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Performance engine preparation Tumble & swirl Too much swirl . . . Slows intake velocity Reduces VE Washes rings with fuel
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Unformatted text preview: Performance engine preparation Tumble & swirl • Tumble Breaks up as cylinder compresses Fuel is concentrated near spark plug Performance engine preparation Intake valve opening & piston travel Purpose – To better synchronize intake valve opening with max piston velocity • Max velocity - When connecting rod is 90º to crank • Pressure is low at max velocity • Occurs later for higher rod ratios Performance engine preparation Intake valve opening & piston travel Valve opening speed • Other factors As rocker arm ratio increases, so does lift, ‘duration’, & area...
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