Rx-8 renesis engine - technical (Part 2)
Rx-8 renesis engine - technical (Part 2)
Reduction Of Unburned Gas Emission And Fast Activating Catalytic Converter:
The Renesis engine retains unburned hydrocarbons from one cycle for combustion in the next – a process that vastly reduces emission of unburned gases in the exhaust. In addition, on starting the engine, secondary air is supplied to the exhaust port by an electric pump. Delivering secondary air in the gap between the dual exhaust ports promotes mixing of exhaust gas with secondary air to promote re-burning.
Furthermore, Renesis has a dual skin exhaust manifold that maintains the temperature of burned gases and ensures that exhaust temperature rises sharply on starting, for faster activation of the high-performance catalytic converter and consequently low Euro Stage III emissions.
Latest Control Technology For Precision Control Of Air-Fuel Ratio:
The fuel metering system for the Renesis engine is a new design. To begin with the previous intake manifold pressure-sensing system for metering air intake volume has been replaced with the hot wire air-flow metre type for more precise metering. The single-loop air-fuel ratio feedback control employing an O2 sensor located upstream of the catalytic converter has been replaced with a double-loop system featuring O2 sensors upstream and downstream of the catalytic converter. The upstream O2 sensor is a linear type achieving straight-line response to a wide-range of air-fuel ratios, promoting precise fuel control from idling to high engine speeds. Combined with the exhaust gas re-burning system (mentioned previously) this reduces exhaust emissions to one tenth the amount recorded for the previous rotary engine.
Technologies For Compact Size And Lighter Weight
Thinner Engine Ribs, Wet Sump Lubrication System And Plastic Intake Manifold:
Mazda employed supercomputer analysis to reduce the thickness of supporting ribs for the engine side housing and other areas while maintaining high rigidity. Furthermore, approximately half the length of the long intake manifold is now made of plastic. Mazda also cut weight by eliminating the mounting bracket for the air conditioner’s condenser, replacing it with a direct-mount arrangement. Measures such as these, together with further downsizing of equipment helped reduce overall engine weight. Renesis also has a wet sump lubrication system with oil pan depth reduced by about 40mm to approximately half that of the previous rotary engine. Combined together, the inherently compact size of the naturally aspirated Renesis engine, plus these extensive downsizing and weight-reducing measures, have yielded an engine weight on a par with all-aluminium, in-line, four-cylinder engines.
Cheers
Bobby
Shy boys don't get sweeties.
Technology For Lower Emissions
Reduction Of Unburned Gas Emission And Fast Activating Catalytic Converter:
The Renesis engine retains unburned hydrocarbons from one cycle for combustion in the next – a process that vastly reduces emission of unburned gases in the exhaust. In addition, on starting the engine, secondary air is supplied to the exhaust port by an electric pump. Delivering secondary air in the gap between the dual exhaust ports promotes mixing of exhaust gas with secondary air to promote re-burning.
Furthermore, Renesis has a dual skin exhaust manifold that maintains the temperature of burned gases and ensures that exhaust temperature rises sharply on starting, for faster activation of the high-performance catalytic converter and consequently low Euro Stage III emissions.
Latest Control Technology For Precision Control Of Air-Fuel Ratio:
The fuel metering system for the Renesis engine is a new design. To begin with the previous intake manifold pressure-sensing system for metering air intake volume has been replaced with the hot wire air-flow metre type for more precise metering. The single-loop air-fuel ratio feedback control employing an O2 sensor located upstream of the catalytic converter has been replaced with a double-loop system featuring O2 sensors upstream and downstream of the catalytic converter. The upstream O2 sensor is a linear type achieving straight-line response to a wide-range of air-fuel ratios, promoting precise fuel control from idling to high engine speeds. Combined with the exhaust gas re-burning system (mentioned previously) this reduces exhaust emissions to one tenth the amount recorded for the previous rotary engine.
Technologies For Compact Size And Lighter Weight
Thinner Engine Ribs, Wet Sump Lubrication System And Plastic Intake Manifold:
Mazda employed supercomputer analysis to reduce the thickness of supporting ribs for the engine side housing and other areas while maintaining high rigidity. Furthermore, approximately half the length of the long intake manifold is now made of plastic. Mazda also cut weight by eliminating the mounting bracket for the air conditioner’s condenser, replacing it with a direct-mount arrangement. Measures such as these, together with further downsizing of equipment helped reduce overall engine weight. Renesis also has a wet sump lubrication system with oil pan depth reduced by about 40mm to approximately half that of the previous rotary engine. Combined together, the inherently compact size of the naturally aspirated Renesis engine, plus these extensive downsizing and weight-reducing measures, have yielded an engine weight on a par with all-aluminium, in-line, four-cylinder engines.
Cheers
Bobby
Shy boys don't get sweeties.
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