Diesel is not measured by "Octane", it is measured by "Cetane". The gas powered engine experienced the 'ping' because of the contamination of diesel which lowered the "Octane" value. That's why some say when your car starts 'pinging' to go from 87 octane to 93 octane to stop the 'ping'.
When gasoline is compressed, the spark detonates the fuel creating combustion. Diesel needs to be much more compressed to get detonation to have combustion.
In a gas engine...what creates this 'ping' is two flame fronts colliding on the compression stroke causing the metallic 'ping' sound. If we could slow down the compression stroke to milliseconds...I'll try to explain what happens. After the fuel charge enters the combustion chamber and both valves are closed. The piston moves up to complete the compression stroke. As the fuel becomes compressed it may detonate before the spark plug arcs to ignite the fuel. The pre-detonation is usually caused by a hot spot on the piston surface i.e. carbon specks, burr of steel, etc. These are usually glowing red hot after a short time from starting the motot.
The hot spot ignites the fuel and as this flame front moves accross the combustion chamber while the piston is completing it's compression stroke. When the piston has reached the length of its stroke the spark plug ignites the fue also. Now you have two flame fronts moving across the combustion chamber towards each other and when they collide is where you get the 'pinging' sound from.
For years many thought this sound came from metal parts 'clanging' angainst each other. Waukesha Engine Division in Waukesha, WI devloped a cylinder with a quartz window so they could view the combustion process. Using high speed photography they were able to see the two flame fronts colliding.
By adding diesel to gasoline you can not get "high pressure spikes and concentrated heat" because diesel needs to be really compressed to obtain that type of detonation. The compression ratio of a gas engine is not anywhere close to the compression ratio of a diesel engine. Therefore, the diesel contamination in gasoline will just foul the plug and soot up the catalytic converter.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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