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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Presentation transcript:

Performance engine preparation Tumble & swirl Tumble = In-cylinder air motion in “4-valve” heads Swirl = In-cylinder air motion in “2-valve” heads

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

Performance engine preparation Tumble & swirl Tumble/swirl is induced by port angles, cylinder walls, & heart shaped chambers

Performance engine preparation Tumble & swirl Too much swirl... Slows intake velocity Reduces VE Washes rings with fuel

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