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I appreciate all the answers I'm seeing so far. I think I may have rambled too much in my first post (apologies). I was somewhat collecting my thoughts as I was writing. My confusion here, is mainly on the differences in fuel rather than the differences of how both engine types operate.
Hypothetical: Let's say we have two imaginary engines, both are identical. These engines are built like a diesel, being that they have high compression ratios and no spark plugs. The only non-diesel aspect is how the fuel is injected. The fuel is injected on the intake stroke instead. One engine has 87 octane gasoline, the other has d1 diesel fuel.
During the compression stroke pressure builds, creating heat. Which fuel is going to ignite earlier in the compression stroke?
My instinct would be gasoline, being that it will auto ignite at 495°F. The diesel fuel, on the other hand, would have to continue to be compressed until it reach around 600°F.
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