The present study investigates the effects of various intake configurations on a firing single cylinder research engine. Eighteen different intake configurations were tested and modeled including a straight baseline case, tapers, varying inlet radii, bends, and S-bends. All of the intakes include a beilmouthed flange at the entrance and retain the same length to the beilmouth, transducer locations, and downstream diameter in an effort to identify the effect of the intake geometry only. An experimental study was conducted where each intake was instrumented with three pressure transducers. One of the pressure transducers was located near the entrance of the intake; the others were located downstream of the barrel throttle. Volumetric efficiency, brake power, and intake and exhaust pressures for each configuration are presented to determine the effect of each geometry on engine performance. Each intake configuration was modeled using a quasi-one-dimensional finite difference engine simulation code, MANDY. The volumetric efficiencies and pressures obtained experimentally are compared to the predictions to assess the code's ability to predict the effects of the various intake configurations on engine performance. Taper area ratios above 1.5 were found to have a detrimental effect on volumetric efficiency at high-speed tuning peaks. The inlet flow losses for the sharpest beilmouth studied (R1/D = 0.05) had a measurable negative effect on volumetric efficiency, while those of larger-radiused inlets were negligible. The flow losses associated with the bends and S-bends also had a detrimental effect on volumetric efficiency compared to the straight pipe. In general, MANDY showed a good agreement with the experiments for each intake configuration for both volumetric efficiency and intake pressure near the valves at the main tuning peak speeds.

Emission and fuel economy regulations and standards are compelling manufacturers to build ultra-low emission vehicles. As a result, engineers must develop spark-ignition engines with integrated emission control systems that use reformulated low-sulfur fuel. Emission Control and Fuel Economy for Port and Direct Injected SI Engines is a collection of SAE technical papers that covers the fundamentals of gasoline direct injection (DI) engine emissions and fuel economy, design variable effects on HC emissions, and advanced emission control technology and modeling approaches. All papers contained in this book were selected by an accomplished expert as the best in the field; reprinted in their entirety, they present a pathway to integrated emission control systems that meet 2004-2009 EPA standards for light-duty vehicles.

Innovative text focusing on engine design and fluid dynamics, with numerous illustrations and a web-based software tool.