ME 515 Design Project
Presented by
Siddhesh Sawant
Data assumptions 2003 Ford Focus engine
4 stroke 4 cylinder inline engine B/S = 0.9639 l/r = 4 Displacement volume Vd = 0.7854 * B sq. * S * N Vd = 1990 cc ~ 2 liters MEP = 4 * pi * T/Vd MEP = 1089.37 kpa HPmax = 128.05 hp @ 5500 rpm Tmax = 127.6 lb-ft @ 5000 rpm
Engine Analysis
CAD sketches
(1) (2)
(3)
1. Piston2. Connecting rod3. Crankshaft
CAD sketches
1. Even firing with 0-180-180-0 mirror symmetric configuration
2. Primary forces and moments balanced due to mirror symmetry
Inline/ 4 stroke/ 4 cylinder/ 0-180-180-0
Graphical Analysis
Plot for gas force and gas torque
Gas pressure
Pg = 1123 psi
Gas Force
Fg = (pi/4) * Pg * B sq.
Work to do
Calculate Inertia TorquePlot Torque Variation for this engineCalculate Secondary Force and MomentHarmonic BalancingAlternate firing orders for good power stroke sequence