Higher than a gasoline engine.
The diesel engine is on compression.
typical compression test reading fora diesel engine
Compression.
2.5 liter Petrol 8-1 diesel 25-1 compression
because a diesel engine ignites its fuel with pressure, and not with a spark like a petrol engine. that is why a petrol engine does not need as high a compression ratio as a diesel engine
Compression ignition engine.
The compression ratio of a Diesel ranges from 14:1 to as high as 25:1. I agree just depends on engine.
Because a diesel ignites due to the heat caused by the compression pressures in the diesel engine.
No, absolutely not. Diesel engines run at a much higher compression than gasoline engines. A typical gasoline engine has a compression ration of 10:1 while the typical diesel compression ratio is 20:1 or higher. The diesel burns fuel through compression and the gasoline burns by ignition. You must use an oil with an API rating of C (Compression) in a diesel. Gasoline engines use API rating S (Spark). Use exactly the proper weight and API rating as listed in your owner's manual. Use a gasoline motor oil and you will destroy that diesel engine. -IMPROVED - I totally agree with Almostevil. I own a diesel and this is what I use. So, I didn't "improve" his answer but do back it up!
It won't run, that's for sure. Diesel is ignited by compression pressure, not by spark. And the compression in a gasoline engine is not sufficient to ignite the diesel.
Diesel engine
It has a compression ratio of 17.5:1