RE: SINGH GROOVES
The groove may improve turbolence in the combustion chamber, but the nitrogen thing is a bit weird. Nitrogen is an inert gas and does not burn, so introducing more nitrogen will only slow the burning process, similiar to EGR. Besides, the engine gets more nitrogen than it needs from the atmosphere.
Just because something has a patent, does not mean it is a good thing, or even works. Anithing that is different can be patented.
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Pete
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