Please explain this difference between diesel and gasoline engines

[dodge man]

Some diesels do have multiple injection events.

 

[part-time-Farmer-NC]

Great engine info in this post. And here I thought it magical when I turned the ignition key there were a bunch of fairies under the hood doing all that work. A little pixie dust (diesel/or gas) goes a long way.

 

[Grumpycat]

Some diesels do have multiple injection events.

Yes that creates a less violent longer duration combustion.

 

[D'oh]

Why are the newer diesel engines a lot quieter than they used to be? Because some electronic engines atomize the fuel in as many as 6 times before the final event where they make the power. With different amounts of fuel. Comparing diesels to gasoline engines is like comparing apples to oranges, except intake compression power exhaust. Unless it is of course a two stroke diesel engine. Or, an opposed cylinder diesel engine. As in the Napier Deltic engines. View attachment 2726359

Actually, they are closer than you think, now that Direct Injection is Widely Used in Spark Ignition Gasoline Engines.

You are correct about Multiple Injection Cycles though making the Diesel Compression Ignition Engine quieter.

So main difference is Spark vs Compression Ignition, and the Build Strength to Handle either, and Potential Energy Found in either Fuel, I believe Diesel has 25% potential energy, weather the Engine design can harness the extra or not is another topic.

 

[dfkrug]

Actually, they are closer than you think, now that Direct Injection is Widely Used in Spark Ignition Gasoline Engines.

...and just to really mess with you, there are now engines that feature both compression-ignition and spark-ignition. Notably the Mazda Skyactiv-X technology, which has gasoline compression ratios as high as 16, instead of the 13-14 ratios in their sparky gas engines (Skyactiv-G).

Plus, Mazda's diesels (Skyactiv-D) have been running CRs as low as 14, utilizing multi-nozzle DI piezo injectors, and computer-controlled exhaust valve lift.

 

[JRH02]

This is a really fun thread!

 

[etpm]

This is a really fun thread!

I started it and never expected it to go on this long. I also learned a bunch of stuff and have a much better understanding of diesel engine operation.
Eric

 

[Riding a Relic]

Actually, they are closer than you think, now that Direct Injection is Widely Used in Spark Ignition Gasoline Engines.

You are correct about Multiple Injection Cycles though making the Diesel Compression Ignition Engine quieter.

So main difference is Spark vs Compression Ignition, and the Build Strength to Handle either, and Potential Energy Found in either Fuel, I believe Diesel has 25% potential energy, weather the Engine design can harness the extra or not is another topic.

Yes, I own two vehicles that have direct cylinder fuel injection.

Actually, they are closer than you think, now that Direct Injection is Widely Used in Spark Ignition Gasoline Engines.

You are correct about Multiple Injection Cycles though making the Diesel Compression Ignition Engine quieter.

So main difference is Spark vs Compression Ignition, and the Build Strength to Handle either, and Potential Energy Found in either Fuel, I believe Diesel has 25% potential energy, weather the Engine design can harness the extra or not is another topic.

Yes, I very well know about direct injection on the gasoline engines. I know that the valves begin to neck with carbon deposits and can cause premature problems as compared to other systems for automotive fuel injections. In fact, two of my personal vehicles run with direct injection. But, they sure do have plenty of power on the open road.

 

[Riding a Relic]

Yes, I own two vehicles that have direct cylinder fuel injection.

Yes, I very well know about direct injection on the gasoline engines. I know that the valves begin to neck with carbon deposits and can cause premature problems as compared to other systems for automotive fuel injections. In fact, two of my personal vehicles run with direct injection. But, they sure do have plenty of power on the open road.

 

[Riding a Relic]

Here is some of my qualifications as to why I know.