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Originally Posted by beef_bourito
I'm not so sure about the diesels being 17:1 cr. the way i understand it, the hotter the air in the combustion chamber, the faster the fuel reacts with the air (basic chemistry, as heat goes up, so does the rate of reaction). so when you increase the compression and/or boost going into a diesel engine, the diesel reacts more quickly so you can burn more fuel during the power stroke. the problem with diesels when they add more fuel is that they can't always burn it all even though there is enough air in the cylender because diesel burns slowly.
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The cummings turbo is 17:1 I looked it up, the reason it can run well at 17:1 is becasue it is turbocharged, hence it crams more air into the cylinder making higher pressure and more heat. The NA 6.2 and 6.5 I used to work on all the time are 22:1 if memory serves, but those things were crap in my book. There is good reason why GM replaced them with the duramax, which I bet if you look up you will find it is near 17:1 too, not for sure but I would almost bet money on it, since it was GM that did the reserch that I am talking about.