Honda 2.0L R20A/R20Z Engine: Specs, Problems, Reliability. In 2007, Honda launched the 3rd gen Honda CR-V in addition to an R20A under the hood. Based on the Honda R-series i-VTEC SOHC engine, a new 2.0-liter four-cylinder gasoline power unit replaced the previous CR-V offering the K20A.
The R20A is a stroked version of the 1.8 L R18A, and in terms of construction, both engines are basically similar. The 2.0 L R20 has an aluminum open-deck cylinder block. Unlike the R18, the R20 engine block has a balancer shaft and additional casting for it. Inside the engine, there is a new crankshaft and shortened connecting rods (152.63 mm) due to the longer stroke (96.9 mm).
Pistons are the same as the R18 has. Engines share the same aluminum 16-valve SOHC cylinder head with the i-VTEC system. The size of valves and ports was increased. The intake valve diameter is 33 mm, exhaust – to 26 mm. The dimension of the valve stem is 5.5 mm. Valves are egged on by one chain-driven camshaft via aluminum roller rocker arms. There are no hydraulic tappets in the R20 valve train.
The R20A includes an adjustable intake manifold with 3 stages for achieving an overall better midrange torque/power delivery than the K20A. The Drive-By-Wire throttle body collaborates with Honda’s i-VTEC system, offering excellent fuel economy during light throttle cruising conditions and optimized smooth torque curve in the crucial areas of the mid-range rpm band.
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Honda 2.0 R20A Engine Problems and Reliability
This Honda’s 2.0 L R20A is very trustworthy, durable engine with a few shortcomings. All small problems with different noises and sounds are common for R-series. You can review them on the R18 review page. The R20 engine lifespan is more than 180,000 miles (300,000 km).
Honda 2.0L R20A/R20Z Engine Modifications
R20A1 – 150 hp (110 kW) at 6,200 rpm, 140 lb-ft (190 Nm) at 4,200 rpm. Request: Honda CR-V, Honda Stream, Acura ILX.
R20A2 – 150 hp (110 kW) at 6,200 rpm, 140 lb-ft (190 Nm) at 4,200 rpm. This engine was used only in the Honda CR-V.
R20A3 – 150 hp (110 kW) at 6,300 rpm, 139 lb-ft (188 Nm) at 4,300 rpm. Use: Honda Accord and Proton Perdana.
R20Z1 – 155 hp (114 kW) at 6,500 rpm, 140 lb-ft (190 Nm) at 4,300 rpm. This engine has a compression setting ratio of 10.6:1. Application: Honda Civic, Honda Accord.
Honda 2.0L R20A/R20Z Engine: Specs
| Manufacturer | Honda Motor Company |
| Production years | 2007-present |
| Cylinder block material | Aluminum |
| Cylinder head material | Aluminum |
| Fuel type | Gasoline |
| Fuel system | Multi-point fuel injection |
| Configuration | Inline |
| Number of cylinders | 4 |
| Valves per cylinder | 4 |
| Valvetrain layout | SOHC |
| Bore, mm | 81.0 mm (3.19 in) |
| Stroke, mm | 96.9 mm (3.81 in) |
| Displacement, cc | 1,997 cc (121.9 cu in) |
| Type of internal combustion engine | Four-stroke, naturally aspirated |
| Compression Ratio | 10.5:1; 10.6:1 |
| Power, hp | 150-155 hp (110-114 kW) / 6,200-6,500 |
| Torque, lb ft | 139-140 lb-ft (190-188 Nm) / 4,200-4,300 |
| Engine weight | – |
| Firing order | 1-3-4-2 |
| Engine oil weight | SAE 0W-20, 5W-20 |
| Engine oil capacity, liter | 3.7 l (4.0 qt) |
| Oil change interval, mile | 9,000 (15,000 km) / 12 months |
| Applications | Honda CR-V, Honda Accord, Honda Civic, Honda Stream, Acura ILX, Proton Perdana |