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Originally Posted by ian_w
If there was ever a good demonstration that power is not everything, you only have to look at the times from the new 800cc bikes which in some cases are faster than the old 990cc ones.
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One of the new 800s is Ilmor's poppet-valve engine, which has raced twice & been in the points. When you've done that, you're not going to throw that away & build a new engine using unproven techhnology.......which is what I said when he posted the exact same post in the formula 1 forum!
Rotary valve have come & gone over the last hundred years or so, but the good old poppet valve works!