K20a2 engine

Types of K20A2 engines

The K20a2 engine is a high-performance engine that is used in various vehicles. The K20a2 engine is a 2.0-liter inline-four-cylinder DOHC i-VTEC engine. This engine has a 9.8:1 compression ratio and produces 155 lb-ft of torque at 6,000 rpm. The K20a2 engine offers a balance of power and efficiency, making it suitable for various driving needs. The K20a2 engine is known for its responsive throttle and strong mid-range torque, making it suitable for daily driving and spirited driving. Below are some of the types of K20a2 engines.

• Honda Civic Type R (EP3) (2002-2006)

  The K20A2 engine was first introduced in the Honda Civic Type R (EP3) model. This model had a high-performance suspension system, larger brakes, and aerodynamic enhancements. The Civic Type R (EP3) was known for its sporty handling and performance capabilities. The K20A2 engine was tuned to deliver higher horsepower and torque outputs compared to other K20 engines.

• Honda Accord (Euro) (2003-2008)

  The Honda Accord Euro (K20A) is a midsize vehicle. The K20A2 engine was used in the Honda Accord Euro variants. The Accord Euro was designed for comfort and a smooth ride, making it suitable for family use and business transportation. The Accord Euro (K20A) had a more relaxed suspension setup, larger wheels and tires, and a quieter cabin compared to the Civic models.

• Honda CR-V (2007-2011)

  The Honda CR-V is a compact SUV. The K20A2 engine was used in some variants of the CR-V. The CR-V was designed for versatility, spaciousness, and off-road capabilities. The K20A2 engine provided additional power for the CR-V's larger size and weight compared to the Civic and Accord models.

• Honda Civic Si (2002-2005)

  The Honda Civic Si (2002-2005) is a compact vehicle. The Civic Si (2002-2005) used the K20A3 engine, which is a variant with slightly lower performance specifications compared to the K20A2. The K20A3 engine was tuned for good fuel efficiency and balanced performance. The Civic Si (2002-2005) had a sporty exterior design, sport-tuned suspension, and sport-oriented interior features.

• Acura RSX (2002-2006)

  The Acura RSX (2002-2006) is a compact luxury vehicle. The RSX was a sporty coupe that offered a blend of performance and luxury features. The K20A2 engine provided a high level of performance, making the RSX a popular choice for sports car enthusiasts.

Specification and maintenance of the K20A2 engine

Specification

• Engine Layout

  The K20A2 is an inline 4-cylinder engine.

• Displacement

  The K20A2 has a displacement of 1998cc (121.9 cubic inches).

• Firing Order

  The firing order is 1-3-4-2.

• Compression Ratio

  The K20A2 has a compression ratio of 11.0:1.

• Horsepower

  The K20A2 engine generates 147 horsepower at 6100 rpm.

• Torque

  The K20A2 engine generates 135 lb-ft of torque at 4500 rpm.

• Valves per Cylinder

  Each cylinder has 4 valves.

• Camshaft Configuration

  The K20A2 has DOHC VTEC (Dual Overhead Camshaft Variable Valve Timing Electronic Lift Control).

• Fuel System

  The K20A2 uses a PGM-FI (Programmed Fuel Injection) fuel system.

• Ignition System

  There are 4 spark plugs and an electric ignition system.

• Cooling System

  The K20A2 uses a water cooling system with a cooling fan.

• Lubrication System

  The K20A2 uses pressurized oil lubrication with an oil filter.

• Fuel Type

  The K20A2 is designed to use unleaded gasoline with an octane rating of 87 or higher.

• Electrical System

  The K20A2 uses a 12V electrical system with a 12V battery and a 12V alternator.

• Emissions Control

  The K20A2 has an exhaust emissions control system that meets the US EPA 2001 and California Air Resources Board (CARB) 2001 standards.

Maintenance

• Engine Oil

  The K20A2 engine oil should be changed every 7,500 miles or 12,000 kilometers or at least once a year. The oil filter must also be replaced with every engine oil change. Honda recommends using 0W-20 or 5W-20 engine oil.

• Air Filter

  The K20A2 engine air filter should be inspected at every other oil change and replaced every 30,000 miles or 48,000 kilometers. The air filter keeps dirt and debris out of the engine to avoid damage.

• Spark Plugs

  The K20A2 spark plugs should be inspected every 30,000 miles or 48,000 kilometers and replaced every 60,000 miles or 96,000 kilometers. Spark plugs ignite the air-fuel mixture in the engine.

• Coolant

  The K20A2 engine coolant should be changed every 60,000 miles or 96,000 kilometers. The coolant absorbs heat from the engine and transfers it to the radiator.

• Fuel Filter

  The K20A2 fuel filter should be replaced every 60,000 miles or 96,000 kilometers to ensure clean fuel goes to the engine. Fuel quality is very important for the K20A2 engine.

• Timing Belt

  The K20A2 timing belt should be inspected every 105,000 miles or 169,000 kilometers. It should be replaced at 120,000 miles or 193,000 kilometers.

• Drive Belts

  These belts should be inspected every 30,000 miles or 48,000 kilometers and adjusted or replaced as needed.

• Valve Clearance

  The valve clearance should be checked and adjusted as needed at 30,000 miles or 48,000 kilometers.

• Wheel Bearings

  The wheel bearings should be inspected and repacked with grease every 30,000 miles or 48,000 kilometers.

How to Choose K20A2 Engine

The K20A2 is a popular choice for many K-series swaps because of its high power output and VTEC configuration. When choosing a K20A2 engine, consider the following:

• Condition: Look for an engine in good condition with minimal wear and tear. Check for any signs of damage or leaks and ensure the engine has been well-maintained.
• Mileage: Consider the engine's mileage, as lower mileage engines will typically provide better performance and longevity.
• Engine Components: When choosing a K20A2 engine, buyers should consider the engine block, cylinder head, camshaft, valvetrain, intake manifold, exhaust manifold, and lubrication system. They should ensure the parts are in good condition and compatible with other components.
• Wiring Harness and ECU: Ensure the wiring harness and ECU are in good condition and compatible with the chosen chassis and engine components.
• Legal Compliance: Ensure the K20a2 engine meets local emissions and legal requirements. Some areas have strict emissions regulations that must be followed when swapping or installing an engine.
• Budget: Consider the overall cost of the engine, including any necessary modifications, installation, and maintenance expenses. Set a budget and choose an engine that fits within those parameters.

How to DIY and Replace K20a2 Engine

Any replacement of the K20a2 engine needs careful planning and execution. It is worth noting that this is no simple task. Replacing the K20a2 engine requires advanced technical knowledge and expertise. With that said, here’s a simplified step-by-step guide on how to replace the K20a2 engine:

• Prepare: Assemble all necessary tools for the replacement. These include a jack and jack stands, engine hoist, socket set, torque wrench, and ratchet. Also, it would be best to have the replacement engine ready and all necessary fluids. Ensure a clean and safe working environment with adequate lighting and space for the engine and components. Wear appropriate safety gear, including gloves and safety glasses.
• Disconnect: Start by disconnecting the battery. Then, drain all the fluids in the engine, including oil and coolant, and dispose of them according to local regulations. Next, use the hoist to lift and support the engine and disconnect all the components connected to the engine.
• Remove: Once the engine is unsupported, it’s time to start removing it from the vehicle. Start by removing the engine mount bolts and any other components holding the engine in place.
• Installation: Place the new engine onto the engine mounts and connect it to the transmission. Then, reconnect all the systems disconnected in the earlier steps. This includes electrical, cooling, and fuel systems.
• Reconnect: Once all the systems are reconnected, refill the engine with the necessary fluids. This includes oil and coolant. Afterward, reconnect the battery.
• Start and check: Start the engine and let it run for a few minutes. Then, check for any leaks or unusual noises. Ensure that all systems are functioning correctly.

Q&A

Q1: What is the K20A2 engine?

A1: The K20A2 engine is a 4-cylinder, 16-valve DOHC i-VTEC engine with an aluminum alloy block and aluminum DOHC cylinder head. It has a bore and stroke of 86 mm x 86 mm, a compression ratio of 11.0:1, and a valve clearance of 0.20-0.25 mm. The K20A2 engine was used in the 2002-2006 Honda Civic Si and 2002-2006 Acura RSX.

Q2: What is the difference between the K20 and K20A engines?

A2: The K20A2 engine is one of the many K20A variants. The K20A2 is often considered the most refined and powerful engine in the K20 family. It features a higher compression ratio, larger intake valves, and a more aggressive camshaft profile compared to the other K20 engines.

Q3: Is the K20A2 engine good for tuning?

A3: Yes, the K20A2 engine is a good engine for tuning. It has a strong internal engine structure and can handle a lot of boost. Many tuners use the K20A2 engine in their builds because it is very responsive to tuning.

Q4: What is the recommended oil for the K20A2 engine?

A4: The recommended oil for the K20A2 engine is 0W-20 or 5W-20 engine oil. Users should only use oils that meet Honda's specifications to ensure optimal engine performance and longevity.

Q5: How often should the oil be changed on the K20A2 engine?

A5: The K20A2 engine requires an oil change every 7,500 miles or 12,000 km. However, if the car is used under severe conditions, such as towing or driving in extreme temperatures, the oil change interval should be reduced to 3,750 miles or 6,000 km.