Why Do Single-Cylinder Diesel Engines Have High Torque?
2 Answers
Because diesel has a high ignition point, it allows for a high compression ratio. Diesel engines typically have a compression ratio above 15:1, while gasoline engines usually max out at around 11:1. Long Lifespan and Economic Durability: Diesel engines operate at lower RPMs, which reduces wear and tear on components, making them less prone to aging compared to gasoline engines. With no ignition system and fewer auxiliary electrical components, diesel engines have a significantly lower failure rate than gasoline engines. Some imported diesel engines can run for 800,000 to 1,000,000 kilometers without major overhauls, whereas gasoline engines typically last only 400,000 to 500,000 kilometers. Additionally, diesel engines are more fuel-efficient—a 2.8L electronically controlled common-rail turbocharged diesel engine consumes about the same amount of fuel as a 1.6L electronically controlled gasoline engine. High Torque at Low Speeds: Diesel engines can generate high torque at very low RPMs, making them superior to gasoline engines in challenging conditions like rough terrain, uphill climbs, or heavy loads. However, they underperform in acceleration and high-speed cruising on flat highways compared to gasoline vehicles. Enhanced Safety: Compared to gasoline, diesel is less volatile, has a higher ignition point, and is less likely to ignite or explode accidentally. This makes diesel a more stable and safer fuel option.
I've been driving tractors for over a decade, and that single-cylinder diesel engine packs a real punch! The key lies in three aspects: First is the diesel compression ignition characteristic, with a compression ratio reaching 20:1 compared to gasoline engines' mere 10:1—it's like holding back the power to its maximum before unleashing it. Second is the exceptionally long piston stroke; my old machine's piston travels nearly half a meter up and down, just like how swinging a sledgehammer delivers more power than tapping with a small hammer. Third is the massive flywheel storing energy—it converts each explosive power stroke into rotational force, which becomes especially noticeable when pulling plows uphill. Although the vibration is a bit intense, this steady, brute force proves far more practical for heavy-duty work than the fancy but less effective multi-cylinder engines.
