100 cc's . . . that's not to the same scale as the rest of the car. It has more displacement than my little Honda ATC had. That explains how kept the sound more authentic. I don't think he mispoke either . . . that'd be an apporoximate base area of 4cm squared for the pistons with a 2 cm stroke, which is believable given the video. I don't have any details on the 327's actual displacement, other than I just assumed that it, like the rest of the engine, was at 1:6 scale (so naturually volume changes by a factor of 6 cubed.)
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