Honda A engine

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Honda A series (A20A) engines displaced 1955 cc ( 119 CID )
Know performance variations is the number following the code A20A_ The higher number usually signifying an improved variation, and improved performance.
A20A1
A20A2
A20A3
A20A4

A20A1: US version, carbureted.
Induction consisted of a 2BBL Keihin Downdraft, vacuum assisted secondary.
The Exhaust manifold was casted in a 4-1 style which had fittings for EGR, Air Suction, and had a single O2 sensor. The downpipe was dual walled pipe to help reduce heat.
A20A2: European version, carbureted.
A20A3: US version PGM-FI (Programmed Fuel Injection)
Induction consisted of a dual runner manifold, a spacer with throttled valves would be operated by diaphragm connected to a solenoid. The solenoid was able to hold vacuum keeping the secondary runners closed till they were needed. Earlier 86-87 EFI models of the Accord did not have the dual runner manifold.
The Exhaust manifold was casted in a 4-2 style which had fittings for EGR only but had two O2 sensors. The downpipe was the completion for the manifold merging 2-1, also using dual walled pipe to help reduce heat.
A20A4: European PGM-FI (Programmed Fuel Injection)
Power outputs range from the 86-87 A20A1 with 98 hp (73 kW) to the 88-89 A20A3 with 120 hp (89 kW).
The Honda A-series engines had a cast iron block and closed deck, with an aluminum 12-valve head (2 intake, 1 exhaust).
Ignition system utilised a distributor which ran directly off of the camshaft with mechanical and vacuum advance, and the ignition coil was external.
One application of the A-series engine was in the 3rd Generation (86-89) U.S. domestic market Honda Accord. The A20 engine was the last engine series made by Honda to use an iron block. From 1990 onwards, all Honda engines have an aluminum block and cylinder head.