Honda E07A engine

The E07A is a three-cylinder gasoline engine developed and manufactured by Honda, with a total displacement of 656 cc. The engine is intended for light-vehicle applications. The E05A and E07A were replaced by the Honda P engine.

The E07A is based on the Honda EH Engine, a SOHC 2-cylinder engine. Like the Honda D engine, it rotates anti-clockwise from the timing belt side. The engine was available with either a computer-controlled variable venturi-type side draft carburetor (PGM-CARB) or a multi-point fuel-injected (PGM-FI) version.

Utilizing a cross-flow design, the intake and exhaust valves are opened and closed by the rocker arm driven by a camshaft timing belt. The two intake and two exhaust valves are positioned on either side of the spark plug which is mounted on the top center of the combustion chamber. The cylinder block and cylinder bore are made of die-cast aluminum, as are the valve covers and oil pan. Early Japanese emissions requirements for passenger automobiles required that exhaust gas purification be accomplished by means of a three-way catalyst. The requirement was later amended to include commercial vehicles as well.

In order to extract higher horsepower from a naturally aspirated engine, Honda modified the E07A with a MTREC (Multi Throttle Responsive Engine Control) system, placing individual throttle-bodies on each of the three cylinders.

The system modified the air-fuel ratio of individual cylinders based on RPM to give sharper throttle response while also maintaining a stable idle.

The ECA1 engine was used in the first-generation Honda Insight, as part of the car's Integrated Motor Assist gasoline-electric hybrid drive system. A three-cylinder engine, it displaces 995 cc (0.995 L; 60.7 cu in) and features a SOHC 12-valve head. The engine produces 67 hp (50 kW) @ 5700 rpm, 73 hp (54 kW) @ 5700 rpm (with IMA) and 67 lb·ft of torque @ 4800, 91 lb·ft of torque @ 2000 (with IMA) supplemented in various circumstances by a 10 kW permanent magnet DC electric motor adding 13 horsepower (9.7 kW) and 16 lb·ft (22 N·m) torque throughout the entire rpm range.

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