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