Actually drilling holes to lighten anything is a very old practice that does very little to remove much weight at all, unless the holes are very large.......At what point does this become a weakness.........You only find out at the track when something fails. These days with CNC machines you can machine sections of a part away which gives much better results to remove weight and less chance of failure. That is how I kept the weight down on the racer I built and done similar to the 1200 Norvin racer I have just finished. I was never quite sure of the weight of the racer when finished, but recently Phil told me that when it was in the Horner's workshop on the scales it came in at about 155 kg's ........I was pleasantly surprised. Cheers............Greg.
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