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The EA71 engine is an internal combustion engine that was manufactured by Subaru. It was used in the Subaru Leone and the Subaru Rex. The EA71 engine is a 1.8 L (1,779 cc) inline-four piston water-cooled engine. The bore and stroke of the EA71 engine are 86 mm and 86 mm, respectively. The compression ratio of the EA71 engine ranges from 8.0 to 10.0, and the maximum power output is 60 kW (80 hp) at 6,000 rpm. The maximum torque of the EA71 engine is 120 N (89 lb-ft) at 3,500 rpm. The EA71 engine has a cast iron block and a cast aluminum alloy cylinder head. The valve configuration of the EA71 engine is OHC (2 valves per cylinder). The fuel system of the EA71 engine uses carburetors, and the fuel type used by the engine is gasoline. The EA71 engine has a dry sump lubrication system and an electric starter system.
Subaru's EA71 engines were known for their durability and low maintenance requirements. Many Subaru owners reported high mileages with few major mechanical issues. The horizontally opposed layout of the engine also contributed to its smooth operation with less vibration compared to inline or V-type configurations.
Subaru offered various performance upgrades for the EA71 engine, such as higher compression pistons, camshaft changes, carburetor or intake manifold swaps, and exhaust system improvements. Enthusiasts could also find aftermarket performance parts to enhance their engine's output further. As emissions standards became stricter and fuel efficiency became more important, Subaru gradually phased out the EA71 engine in favor of newer technologies like turbocharging and variable valve timing. The last Subaru vehicles with the EA71 engine were produced in the early 2000s.
Despite the discontinuation of the EA71 engine, its legacy lives on. The EA71 laid the foundation for Subaru's future success in developing boxer engines and all-wheel drive technology. Today, Subaru is known for its reliable, fuel-efficient, and versatile vehicles that cater to various markets and customers.
Configuration:
The EA71, like most Subaru engines, has a horizontally opposed (flat) configuration. This means that the cylinders are arranged in two rows, with each row opposite the other like a wide V. This configuration provides smooth operation, good stability, and a low center of gravity.
Cylinder head:
The EA71 engine has aluminum cylinder heads, which are lighter than cast iron or steel heads. The heads contain the combustion chambers, valves, and spark plugs.
Valvetrain:
Each cylinder head has two valves (one intake valve and one exhaust valve) for each cylinder. The valves control the flow of air-fuel mixture into the cylinders and exhaust gases out of the cylinders.
Fuel system:
The EA71 engine uses a carburetor (in older versions) or fuel injection (in later versions) to mix fuel with air. The air-fuel mixture is then delivered to the cylinders for combustion. Carburetors use mechanical parts and rely on airflow to mix fuel and air, while fuel injectors use electronic controls to provide more precise fuel metering.
Cooling system:
The EA71 engine is cooled by a liquid cooling system. Coolant, a mixture of water and antifreeze, circulates through the engine to absorb heat and then flows to the radiator. The radiator dissipates the heat, and the coolant returns to the engine to maintain a stable temperature.
Ignition system:
The EA71 engine uses a conventional ignition system with a battery, ignition coil, distributor, and spark plugs. The ignition coil converts the low voltage from the battery to a high voltage for the spark plugs. The distributor routes the high voltage to the appropriate spark plug based on the engine's position.
Lubrication system:
The EA71 engine has a pressurized lubrication system that uses an oil pump to circulate oil from the oil pan through the engine. The oil lubricates the moving parts, reducing friction and wear while also carrying heat away.
Regular maintenance is essential to keep the Subaru EA71 engine running smoothly and reliably. Here are some general maintenance tips:
Follow the recommended maintenance schedule:
Subaru provides a maintenance schedule for each vehicle model. Follow the schedule for the recommended maintenance intervals for oil changes, filter replacements, spark plug changes, and other services.
Use quality engine oil:
Use engine oil that meets the specifications in the owner's manual. Change the oil and oil filter regularly to keep the engine clean and well-lubricated.
Check and replace air and fuel filters:
Inspect the air filter regularly and clean or replace it as needed. A clean air filter helps maintain good engine performance and fuel efficiency. Also, check the fuel filter regularly and replace it according to the recommended schedule.
Monitor engine cooling:
Check the coolant level in the reservoir and the radiator. Top up with the recommended coolant if needed. Also, inspect the hoses, belts, and other cooling system components for wear or leaks and replace them if necessary.
Check the ignition system:
Inspect the spark plugs, ignition wires, and other ignition system components. Replace the spark plugs according to the recommended schedule or if worn out. Ensure the ignition system works correctly for stable engine operation.
Check the lubrication system:
Change the engine oil and oil filter regularly. Use oil that meets the specifications in the owner's manual. Also, inspect the oil system components, such as hoses and seals, for leaks or damage.
Monitor engine performance:
Pay attention to the engine's performance, sound, and operation. If there are any performance issues, unusual noises, or warning lights, take the vehicle to a qualified mechanic for inspection and repair.
Use genuine Subaru parts:
When replacing engine components, use genuine Subaru parts or quality aftermarket parts. This ensures good compatibility and reliability for the engine.
When buying an EA71 Subaru engine, the focus should be on the details. Get the full story on how the engine was used, cared for, and maintained. Check out whether it was run in a car, boat, or on a motorbike. Each application has its own wear and tear pattern. A well-kept engine from a car may be in better shape than one used in a boat for saltwater or coastal trips.
Subaru engines, like people, have their health records. Look for any repairs, rebuilds, or major fixes that have been done. An engine with a clean bill of maintenance may be a smarter pick than one with a history of repairs, even if it has lower miles.
Of course, mileage matters, but it's not the only thing to consider. An engine with higher miles but regular, documented maintenance could outlast an engine with lower miles and spotty maintenance records.
Condition and wear are key. Inspect the engine body for cracks, rust, or damage. Check the timing belt and other parts for age and wear. Look for oil leaks, rust, or signs of trouble. A compression test can reveal how well each cylinder holds pressure. Uneven readings may mean a rebuild is needed soon.
Choose an engine that matches the needs and expectations of the target market. Consider factors like fuel efficiency, power output, and emissions performance.
A key part of choosing the right Subaru EA71 engine is making sure it passes emissions rules, especially in areas with strict standards. Check if the engine has been modified in any way that could cause emissions problems.
Decide how much flexibility is wanted when swapping the engine into a vehicle or using it in other applications. Determine whether an engine with more adapters and options to work with many setups is needed.
Some people love the sound of a well-tuned Subaru EA71 engine. To keep things as is, check the exhaust system and muffler. See if they match what is wanted for noise levels and emissions compliance.
Consider the weight of the EA71 engine and how it will affect vehicle handling, performance, and fuel efficiency. Research the cooling requirements of the engine and whether it will fit within the available space. Determine whether additional modifications will be needed to the vehicle or equipment to accommodate the engine.
Choosing the right EA71 engine means thinking about the little things as much as the big ones. From how it sounds to how it cools, every detail matters. Get an engine that fits perfectly, performs awesomely, and meets all the rules. It's not just about power; it's about the right power in the right way.
Subaru EA71 engine replacement may sound complicated, but with the right tools and instructions, it can be DIY-friendly. Firstly, gather the necessary tools for the job, such as wrenches, sockets, ratchets, and jacks. After that, read through the manual to understand the process. This will help in knowing the steps and disassembly required.
Once everything is ready, disconnect the battery and drain the fluids. Next, remove the engine accessories which include the air intake, exhaust, cooling, and electrical systems. After that, remove the bolts and prepare to lift the engine out of the bay. With the engine hoist, lift the engine out of the bay carefully.
At this point, installing a new Subaru EA71 engine or rebuilding the old one can be done while still at the surface. Once done, carefully lower the engine back into place and reconnect all systems. Refill the fluids and reconnect the battery. Start the engine and check for any issues or leaks.
Q1: What cars use the EA71 engine?
A1: The Subaru EA71 engine is a four-cylinder, air-cooled, and horizontally opposed engine that was produced by Subaru in the 1970s and 1980s. The Subaru EA71 engine was used in several Subaru models during its production, including:
Q2: What is the power output of the EA71 engine?
A2: The Subaru EA71 engine produced different power outputs depending on the variant and model. Generally, the power output ranged from 60 to 80 horsepower. The EA71 engine was known for its smooth and efficient operation, which contributed to its popularity in Subaru's early models.
Q3: What is an EA71 engine swap?
A3: An EA71 engine swap refers to replacing the original engine in a vehicle with an EA71 engine. This is often done to improve performance, increase fuel efficiency, or modernize the vehicle while retaining its classic charm. Engine swaps require careful planning, execution, and consideration of factors like compatibility, wiring, and emissions regulations.
Q4: What are the common issues with the EA71 engine?
A4: Like any engine, the Subaru EA71 has its share of common issues. These may include overheating, oil leaks, low compression, and fuel system problems. Regular maintenance, timely repairs, and using quality replacement parts can help mitigate these issues and keep the engine running smoothly.
Q5: Can the EA71 engine be modified for better performance?
A5: Yes, the Subaru EA71 engine can be modified to enhance performance. Upgrades may include improving the intake and exhaust systems, adding a turbocharger (in some variants), optimizing engine management, and tuning the engine for more power. However, modifications should be done carefully, considering reliability, drivability, and emissions compliance.
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