The engine employs a dual-overhead camshaft (DOHC) design with four valves per cylinder. Variable valve timing is used on both the intake and exhaust sides of the engine to optimize gas flow and improve efficiency. Additionally, VTEC operates the intake valves on three different profiles – low-lift, intermediate, and high-lift – according to engine speed and load for optimal performance across various situations.
Hybrid technology allows the G-23 Hybrid VTEC engine to recapture brake and deceleration energy via a generator that converts into electrical energy stored in a battery pack; then it can either use it to assist the combustion engine for increased performance/torque or run specific auxiliaries.
Specifications:
- Engine type: 2.3 L (2,253 cc) I4 hybrid
- Bore: 86 mm (3.39 in)
- Stroke: 86 mm (3.39 in)
- Valves: 16 (DOHC, 4 valves per cylinder)
- Compression ratio: 10.2:1
- Horsepower: 162 hp (121 kW) at 6,400 rpm
- Torque: 159 lb-ft (215 Nm) at 4,500 rpm
This engine was primarily used in Japanese domestic market (JDM) hybrid vehicles such as the Honda Accord hybrid and Insight but could also be imported into overseas markets via grey market imports, especially popular amongst enthusiasts for tuning due to its combination of efficiency and higher specific output and low cost. These are also fairly reliable power units that can potentially offer better fuel economy with some careful modifications.
