How Diesel Engines Work

When gas is compressed, the temperature of it will rise, with diesel engines using this very property to ignite the fuel. Air is then drawn into the cylinder and compressed by the rising piston at a much high compression ratio than gas engines, up to 25:1, with the air temperature reaching 700 – 900 degrees C.

At the top of the piston stroke, the diesel fuel is injected into the combustion chamber at high pressure, then through an atomizing nozzle, it mixes with the hot high pressured air. The resulting mixture will ignite and burn very rapidly. This combustion will cause the gas in the chamber to heat up rapidly, which increases the pressure and forces the piston downwards.

The connecting rod will transmit this motion to the crankshaft. The scavenging of the engine is either done by ports or valves. To get the most out of a diesel engine, use of a turbocharger to compress the intake of air is vital. You can also use an aftercooler or intercooler to cool the intake air after compression by the turbocharger to further increase your efficiency.

An important part of older diesel engines was the govenor, which limited the speed of the engine by controlling the rate of fuel that was delivered. Unlike gas engines, the air that comes in is not throttled, so the engine would overspeed if this wasn’t done. Older style injection systems were driven by a gear system that came from the engine.

The diesel engine is truly an advancement to vehicles as we know it. As technology gets better, you can expect the diesel engine to get better as well, possibly even proving just how much better it is to the gasoline engine.

Recommended Reading

1. Why People Use Diesel
With diesel engines, the compression ratio is higher and there is more power. From a technical point, the compression ratio...
2. Why You Should Choose Diesel
The major distinction between diesel and gas lies in the type of ignition. While gas engines operate on spark ignition,...
3. Advantages Of Diesel Engines
If you've owned a diesel powered vehicle in the past or if you own one now, you no doubt appreciate...
4. Diesel Engines And Well Known Gas
In passenger cars, the diesel engine has never really caught on. During the middle to late 70s, diesel engines in...
5. General Information On Diesel Engines
Diesel engines offer the lowest specific fuel usage of any other large internal combustion engine. The fact remains, two-stroke diesels...