11-05-2007, 01:58 AM
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Join Date: May 2003
Location: Live free or Die
Posts: 16,465
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Quote:
Originally Posted by Busy Little Shop
Quote Furusawa:
"We have made a lot of computer simulations of a V4 and we have found good and bad points," Furusawa said in a media presentation. Yamaha preferred the in-line four because it permits a more compact engine and a shorter wheelbase.
V4 GOOD POINTS:
1) Cube-like crankcase are inherently more rigid than the longer,
beam-like case of an I4 engine.
2) Short V4 crankshaft travels less and weights less than an I4...
3) 90º V4 has perfect primary balance, a great improvement over
the buzzy, second-order vibration of an I4...
4) A narrow V4 affords up to a 35% reduction in aerodynamic drag over
the wide I4...
5) A V4 has less internal crank bearing friction and able to deliver
more rear wheel HP...
6) A V4 sports superior power delivery and able to achieve greater
tire grip...
7) Rossi believes more in the new V4 than the old I4...
8) The V4 exceeds the current I4 in MotoGp...
V4 BAD POINTS:
1) More costly...
2) "Yamaha's in-line four has a more compact engine and a shorter
wheelbase."
3) "We stick with the I4" because V4s are not a part of Yamaha's plans
to dominate WSBK...
4) The I4 may match the V4 in the future...
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let's hope that yamaha does not catch a case of Honda's pride on this one
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