Engines

AUTOMOTIVE ENGINEERING / ENGINE COMPONENTS EXPLAINED Two Ways to Keep an Engine Running in Perfect Time Understand how timing belts and timing chains synchronize engine components, why manufacturers choose different designs, and what drivers should know about maintenance. ENGINE TIMING MAINTENANCE REPAIR COSTS Every modern four-stroke gasoline or diesel engine depends on precise mechanical timing. … Read more

Forced induction turbocharging is the primary engineering catalyst behind modern engine downsizing, enabling modest 1.5 to 2.0-liter displacement powerplants to produce torque curves that surpass large naturally aspirated V8 engines. By capturing thermal enthalpy and kinetic momentum that would otherwise be rejected into the atmosphere via the exhaust pipe, a turbocharger drives a centrifugal compressor … Read more

The valvetrain of an internal combustion engine governs the breathing capacity of its cylinders, dictating volumetric efficiency ($\eta_v$), gas exchange pumping losses, internal exhaust gas recirculation (EGR), and high-RPM power limits. While early automotive engines relied on fixed camshaft profiles that represented an uneasy compromise between smooth idle stability and high-RPM power delivery, modern powertrains … Read more

The transition from legacy port fuel injection (PFI) to Gasoline Direct Injection (GDI) represents the most impactful powertrain engineering advancement in spark-ignition engines over the past two decades. By spraying finely atomized gasoline droplets directly into the combustion chamber at pressures exceeding 200 to 350 bar (2,900 to 5,000 psi), GDI systems exploit the latent … Read more

In the physical science of automotive propulsion, reciprocating internal combustion engines represent classical thermal machines designed to transform chemical enthalpy locked within hydrocarbon fuel molecules into usable mechanical shaft torque. Over a century of thermal engineering has refined the four-stroke reciprocating architecture—comprising intake, compression, power, and exhaust strokes—into specialized thermodynamic cycles tailored for distinct operational … Read more