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One thing to keep in mind is that on our engine, being turbocharged, the bottleneck lies in the strength of the parts, not in the rev-ability of the engine. If this were a high performance naturally aspirated engine that just couldn't rev any higher to make power, then I'd see where your next point of attack would be to lighten all moving parts as much as necessary. A good example of this would be a Formula One car. But our cars have no trouble producing the power, and handling the power is the main concern. I think lightening the parts is not too effective in our case when compared to other options we have (such as running more boost, producing more power, and being able to take that added stress). I also see that Ash is trying to remove weight from the crank end of the rod. This is a waste of time in my opinion. The reciprocating mass is much, much, more important that the rotating mass. He's trying to shave off a few grams here and there on a critical structural part, meanwhile there's a 20+lb weight (flywheel) attached to the end of the crankshaft. To make things worse, much of that weight is pretty far from the center of rotation, as opposed to the crank itself, which is at the center of rotation.
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