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Originally Posted by BOBTAIL
I'm thinking evolution here, ...
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True, the later a new engine type is designed, the more one would presume its a better design than its predecessor.
However, the engineers had a lot of constraints they had to stay within. One obvious one that comes to mind (especially regarding fans and besides build-cost) could be the available 'space' on top, in front or whatever side of the engine.
So, the best technical solution, is not always what has been produced...
Greets,
Walter
Edit: The mail just brought a 993 head by today
Nice design. I believe it has a 49mm intake valve and a 41mm intake port stock for a 100 mm bore
