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Beitrag: [QUOTE="JohnA, post: 589123, member: 9249"] We know that if we are to keep the safety margins intact, then a rise in boost should be accompanied by a further reduction of the Compression Ratio. There are other modifications needed as well, but let's stick to CR for now. One of the major detterents for detonation built in this kind of engines, is the combustion-chamber shape, which is designed to stir up the charge right before it's about to be ignited (so that the spark stands a good chance to light in an area with decent Air-Fuel ratio, etc..etc...) There are several ways to reduce the CR, but almost ALL of them change the shape of the combustion chamber - as a result any squish, swirl or tumble motion will not be as the manufacturer intended. I know from experience (different engines) that you may reduce a CR from 8:1 to 7:1 and end up with MORE detonation because of this altered shape of the combustion chambers. Question for Arno: ----------------------- Having done destruction tests on LETs, and having experimented on these engines more than most of us ( :lol: ), which method have you found best? [/QUOTE]

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