during the 1980s. A20A1 & A20A2 The A20A1 and A20A2 were the carbureted versions of the A20A engines. It was available in the 1986–1989 Accord DX and LX. They are the same engine, the only difference between them being that the A20A2 has no emissions components, so it has a slightly higher power output. Specifications Induction: Single 2bbl Keihin Feedback Carburetor Exhaust: 4-1 Cast Manifold Displacement: Bore x Stroke: Compression Ratio : 9.2:1; 9.1:1 (Accord KX model) Power (A20A1): at 3500 rpm Power (A20A2, Indonesia): at 5500 rpm at 3500 rpm A20A3 and A20A4 The A20A3 and A20A4 were the fuel injected versions of the A20A engines. They were run by Honda's PGM-FI system on a partial OBD-0 computer. The A20A4 gives a slightly higher power output because of not having emissions components. The A20A3 was offered in the 1984–1987 Honda Prelude 2.0Si, the 1986-1989 Honda Accord LX-i as well as the 1989 Honda Accord SE-i. In 1988, the A20A3 injection system in the US and Canada has been upgraded with a new two-stage intake manifold (Dual-Stage Intake Manifold) and 4-2-1 exhaust manifold and the compression ratio has been increased from 8.8 to 9.3 netting extra 10hp and 8lb-ft of torque. Specifications Induction: Honda PGM-FI Exhaust: 4-1 Cast Manifold (1984–1987); 4-2-1 Cast Manifold (1988-1989) Displacement: Bore x Stroke: Compression Ratio : 9.4:1; 8.9:1 (Accord KS Model); 1:8.8 (Accord KX & KG with catalytic converter); Power: 1984–1987: at 5500 rpm & at 4500 rpm 1988–1989: at 5500 rpm & at 4000 rpm See also List of Honda engines References A engine Straight-four engines Gasoline engines by model