Harley-Davidson introduced the 1340 Evolution engine in 1984. It was a significant improvement over its predecessor, the Shovelhead engine, with better performance and reliability. The Evolution engine also became the foundation for many Harley-Davidson models, including the Sportster, Softail, and Dyna series. In this article, we will explore the 1340 Evo engine diagram and its components.
Engine Block
The engine block is the foundation of the engine. The 1340 Evo engine block is made of cast iron, and it houses the crankshaft, camshaft, and other internal components. The cylinder barrels are integrated into the engine block, and they have a 45-degree angle between them, giving the engine its distinctive V-twin shape.
The engine block has several oil passages that lubricate the internal components. The oil is pressurized by the oil pump, which is located at the bottom of the engine block.
The engine block also has several mounting points for the transmission, primary drive, and other external components. It is essential to maintain the engine block’s proper torque specifications to prevent leaks and other issues.
Overall, the engine block is the heart of the 1340 Evo engine, providing power and durability.
Crankshaft
The crankshaft converts the up-and-down motion of the pistons into rotational motion, which drives the transmission and rear wheel. The 1340 Evo engine has a one-piece forged steel crankshaft, which is heat-treated for strength and durability.
The crankshaft has several journals that support the connecting rods, which are attached to the pistons. The main journals are also supported by bearings, which are lubricated by the engine oil.
The crankshaft’s timing marks are used to time the camshaft and ignition system. It is essential to follow the manufacturer’s specifications for proper timing.
Overall, the crankshaft is a critical component of the 1340 Evo engine, providing power and reliability.
Camshaft
The camshaft controls the opening and closing of the engine’s valves. The 1340 Evo engine has a single camshaft located in the engine block, which is driven by a chain connected to the crankshaft.
The camshaft has several lobes that push against the lifters, which in turn push against the pushrods. The pushrods activate the rocker arms, which open and close the valves.
The camshaft’s timing is synchronized with the crankshaft and ignition system for optimal performance. It is essential to follow the manufacturer’s specifications for proper timing.
Overall, the camshaft is a crucial component of the 1340 Evo engine, controlling the engine’s valves and performance.
Pistons and Rings
The pistons and rings create the combustion process that drives the engine. The 1340 Evo engine has two pistons with a 3.5-inch bore, and they are made of cast aluminum alloy. The pistons are connected to the crankshaft via the connecting rods.
The pistons have rings that seal the combustion chamber and prevent oil from entering the cylinder. The rings also help to transfer heat from the piston to the cylinder walls.
The pistons must be properly aligned with the crankshaft and camshaft for optimal performance. It is essential to follow the manufacturer’s specifications for proper assembly.
Overall, the pistons and rings are critical components of the 1340 Evo engine, creating the combustion process and power.
Valves and Rocker Arms
The valves and rocker arms control the intake and exhaust of air and fuel in the combustion chamber. The 1340 Evo engine has two valves per cylinder, with one intake and one exhaust valve.
The valves are actuated by the rocker arms, which are activated by the pushrods, which are activated by the lifters, which are activated by the camshaft. The rocker arms have several adjustment points, which must be set according to the manufacturer’s specifications.
The valves must be properly seated and sealed to prevent the loss of compression and power. It is essential to follow the manufacturer’s specifications for proper assembly and adjustment.
Overall, the valves and rocker arms are critical components of the 1340 Evo engine, controlling the flow of air and fuel and contributing to the engine’s power and efficiency.
Oil System
The 1340 Evo engine has a sophisticated oil system that lubricates and cools the internal components. The oil system includes the oil pump, oil filter, oil pressure switch, and oil cooler.
The oil pump is located at the bottom of the engine block and is driven by a gear connected to the crankshaft. The oil pump sends oil through the oil passages in the engine block to lubricate the internal components.
The oil filter removes contaminants from the oil, preventing damage to the internal components. The oil pressure switch monitors the oil pressure and sends a signal to the warning light if the pressure is low.
The oil cooler helps to dissipate heat from the oil, which can prolong the life of the engine and prevent overheating.
Overall, the oil system is a critical component of the 1340 Evo engine, providing lubrication and cooling to the internal components for optimal performance and durability.
Frequently Asked Questions (FAQ)
Question | Answer |
---|---|
What is the displacement of the 1340 Evo engine? | The 1340 Evo engine has a displacement of 80 cubic inches or 1,340 cc. |
What is the compression ratio of the 1340 Evo engine? | The compression ratio of the 1340 Evo engine varies depending on the model and year. Most models have a compression ratio of around 8:1. |
What type of fuel does the 1340 Evo engine use? | The 1340 Evo engine is designed to run on gasoline with an octane rating of 91 or higher. |
What is the horsepower and torque of the 1340 Evo engine? | The horsepower and torque of the 1340 Evo engine vary depending on the model and year. Most models have a horsepower output of around 60-70 hp and a torque output of around 70-80 lb-ft. |
What is the recommended oil for the 1340 Evo engine? | The recommended oil for the 1340 Evo engine is a high-quality conventional or synthetic 20W-50 motor oil. |
Overall, the 1340 Evo engine is a reliable and durable V-twin engine that has become a legend in the Harley-Davidson community. Understanding its components and how they work together can help you maintain and repair your engine for optimal performance and longevity.