Here are few major reasons for higher torque production in diesel engines: The compression ratio of normal diesel engines is higher than that of its gasoline counterparts. It adds to the development of higher peak pressure inside the combustion chamber and, hence, on the crankshaft. Combustion: A gas engine compresses a fuel-air mixture and then ignites it with a spark.
A diesel engine compresses air to such a high pressure and temperature that fuel gets ignited automatically with no need for a spark. Stroke Length: The piston stroke is longer in a diesel engine in order to compress the air more.
Diesel fuel has lower calorific value and is denser than gasoline. Diesel also burns steadily and faster than gasoline. Since engine speed is less, diesel engines are inherently designed to produce a higher torque output at lower rpms. A petrol engine is most effective at the time when the spark plug ignites the fuel-air mixture. This effectiveness slowly fades out by the time the piston reaches the bottom of the cylinder in the power stroke.
In a diesel engine though, it is only air inside the engine that is compressed and there is no fuel-air mixture. Since ignition happens when diesel is introduced into the cylinder, the combustion can be continued until the piston reaches the bottom of the cylinder. The days of old DI engines are gone and all diesel engines in production today are turbocharged. Diesel engines being built strong, with tough and heavy internal components can handle high turbocharger boost pressure. Running 15psi of turbo boost on petrol engines is considered high turbo boost.
On the other hand, most production turbo-diesels run between psi. Running up to 50psi on high performance diesels is not very far fetched. This invariably leads to a high torque output. DriveSpark Thinks!
Most performance enthusiasts consider the high-revving nature of petrol engines to be fun, and they are fun-to-drive. However, diesel engines are a different kind of fun given their torquey nature. Diesel engines with their unmistakable clatter, low-down torque and turbo boost kick-in are considered by many to be more fun-to-drive than petrol engines.
Get the Best Drivespark Stories. Subscribe Now notifications. India - 29,, World - ,, Hide Sample. For Daily Email Alerts. This is a technology often found on modern diesel engines, as the diesel engine requires a healthy amount of airflow.
Diesels are built to handle turbos. Add more air, and you make more power. The same holds for a gas engine, but they aren't turbocharged as often. Finally, diesel fuel itself packs more energy density than gasoline. Jason says it's between 10 and 15 percent. More energy also means more power. Jason does an excellent job of walking us through the basics of diesel engines and the torque they produce.
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