The Differences Between Petrol and Diesel Engines

Here's everything you need to know about the differences between petrol and diesel engines.

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Golf TDI

Volvo Diesel
Video by CHARLIE LEES

Diesel

[rocksteph]

Just think about, why Vin Diesel is not Vin Petrol... ;

[dylannotaro]

As a diesel mechanic I can tell you they are much more reliable and easy to work on. BUT you can’t beat the joy of a high revving gasoline motor.

[dylan]

Hands down the best explanation of not only petrol/diesel differences, but also of the strokes in a 4-stroke engine. So concise and simply presented. Well done, guys!

[MadProductionsink]

You forgot to mention that it is easier to start a petrol in winter, that's why most Russian big trucks run on petrol, so they can start in winter in Siberia

[andmicbro]

The thing that really made me like diesels is that you can create diesel fuel from almost any oil, like vegetable oil, or even used cooking oil (as long as you properly filter out particulates). It does have to go through a refining process, but you could essentially make your own biodiesel with oil at home if you wanted. That's cool! You basically just need oil, methanol, and lye, and some know how, and you can make biodiesel that can run in modern diesel engines with no conversion necessary (except if you have natural rubber seals, biodiesel eats through them so you'll need synthetic seals).

[tsobenny]

Our company has several cars with the same model and year but different engines. The petrol one consume 1 litre per 7 km. The diesel one can go about 10.5 km per litre. I like diesel more not only the fuel efficiency but also its got more power going uphill.

[fspotter]

When you learn more from a 4.5 minute video than an entire day at school
Edit: This is a joke dont take it seriously jesus, some people I swear...

[Luka-hcde]

If this world starts going for electric cars, which it is doing, then in about 50 years, history teachers in school will use this video to show kids what it was like in the petrol/ diesel era

[Choqobot]

a 5-minute video literally helped me understand a lot, not only with regards to the differences between diesel and petrol engine, but also with regards how the 4-stroke cycle of an engine works. kudos to you good sir! thank you for this very informative video.

[atv]

1, 5K dislikes are from people, that have electric cars

[ishkadoo]

Just completed the first year of my engineering degree at uni. A big chunk of the Thermodynamics module was based on the differences between the Otto and diesel cycle. CT got it spot on. Aspiring engineers, listen up.

[az]

Let the turbo kick in when you drive a diesel car, its sound, its torque will make you forget a petrol car...certainly yes i am a diesel engine fan

[mechanicd]

This is a simple and perfect animation to understand the difference between petrol and diesel engine.

[RobMarx]

I own both a Turbocharged Petrol (2005 1.5T Mitsubishi Colt CZT) and a Turbocharged Diesel (2016 Seat Leon FR 184 TDI with a DTUK Tuning Box) car. Personally, I prefer the Diesel, boost kicks in way sooner (1800 RPM in the diesel, around 3500 in the Petrol) so it's great for overtaking and just in general driving such as pulling away from Junction. However I always make sure to only use the Diesel for longer journeys and the Petrol for shorter journeys to shops and such as the DPF getting clogged can be a big problem with the Diesel if you're not driving it often and long enough.

[x]

remember the other diesel video that Car Throttle posted but took down 30 seconds later???

[ketchup]

How can I only be finding this out now.
Where have I been all my life

[clayduval]

From an engineering standpoint, the diesel's are way better due to the higher thermal efficiency. Now if we could do a diesel cycle with gasoline rather than an Otto cycle... that would take the cake

[old_kitsune]

I think these videos are some of my favorite
They educate in a very entertaining way and give us the sweet, sweet data all us nerds crave

[stathisbikos]

One should point out that, although some newer diesels do have a throttle body/valve, it's not actually required for engine operation. Vehicles that do have it use it for allowing efficient EGR operation, smoother engine shutdown and sometimes help with engine braking.

Diesels can't actually restrict airflow like petrol engines during normal operation as any significant decrease in airflow will reduce ultimate compression pressure below minimum and hinder fuel ignition.

Thus throttle valves only operate during engine coasting (to help with EGR) or during shutdown (to reduce piston knock back as the engine stops) and in some other specific scenarios.

<3

[trepals]

Very helpful, thank you YouTube for the recommendation!