The Renesis engine is a further development of the "Wankel" rotary engine. The operating cycle is the same as the conventional rotary engine, with improvements to it's design which has the result of improving fuel economy when under load.
They are designed with either a low output (154 kw version) for use with automatic transmissions or a high output (184 kw version) for use with manual transmissions.
The fundamental design is the same, however some changes have been made so the engine can comply with current emission regulations.
The exhaust ports have been moved from the periphery of the combustion chamber to the side of the housing. They have also been enlarged. Their location delays their opening, when compared to the wankel engine, providing a longer expansion stroke, increasing thermal efficiency. In addition the rotor is machined so as to delay the closing point.
The intake ports have also been enlarged and moved to the side of the housing The low output engine has 2 intake ports, primary and secondary. The high output engine has 3 intake ports, primary, secondary and auxiliary.
The ports are enlarged when compared to the wankel engine. Their position allows them to open sooner improving power and torque and extending engine efficiency over a wider engine speed range.
The intake manifold has primary, secondary and auxiliary ducts. The primary duct has no control valve, the secondary and auxiliary ducts are controlled by butterfly valves.
At low engine speeds, air flows into the engine through the primary intake ducts only, keeping the air velocity in the manifold high providing better air fuel mixing.
At medium engine speeds, and when engine load is high enough, the secondary intake ducts are opened by butterfly valves, reducing restriction and increasing airflow and torque.
At high engine speeds, an extra air duct opens on the air cleaner allowing extra air to be drawn into the engine.
On the high output engine at engine speeds above 6000 rpm the auxiliary duct opens allowing the engine to draw air in through all 6 ports, further increasing engine breathing.
A butterfly valve located between each housing's main intake duct is used at speeds above 7000 rpm to shorten the effective length of the intake tubes so as to use pressure pulses to force more air into the engine.
Low output engines have 2 fuel injectors per rotor, primary and secondary. The primary fuel injectors operate at all times, the secondary injectors operate at engine speeds over 3700 rpm and when the engine load demands more fuel.
The high output engine has additional primary injectors, named primary 2, which only operate at very high speed and load conditions.
Source: CDX Global
