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Message: <blockquote data-quote="mllud" data-source="post: 17686" data-attributes="member: 1012">I  guess the difference is the differenceis with a gas engine is that the spark plug helps fire the either ai the proper time with the compression stroke. With the diesel ,compression fires the fuel mist and if its mot sprayed to a particular cylinder in the right time it can fire in the wrong cylinder at the wrong time or at the wrong part of the stroke .If a gas engine is out of time either can do damage also. It just doesnt seem to happen as much with gas engines. That could be that most of the gas engines that ive used either in probably didnt have much compression left. Mike</blockquote>