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September 13th, 2012, 01:48 PM   #1
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Is a 90 degree V4. I sneaked a glimpse of one today.
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September 13th, 2012, 01:55 PM   #2
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holy shit kropos back





i thought it was a 72°?



interesting,maybe thats why ducati haven't changed their engine
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September 13th, 2012, 02:13 PM   #3
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Holy shit was exactly what I thought. Out of here again for a bit....
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September 13th, 2012, 02:17 PM   #4
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BUT WHAT ABOUT THE VSG's FOR GODS SAKE!! WONT SOMEONE PLEASE THINK OF THE VSG'S!!!!
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September 13th, 2012, 02:22 PM   #5
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Hang on, does that mean the 800 was a 90 deg v4 aswell? Or have they made a completely new design engine for this season?
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September 13th, 2012, 02:30 PM   #6
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good question, just based on the sound i always thought the firing order was much more even than the ducatis. but what do i know...
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September 13th, 2012, 02:44 PM   #7
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I Ride: Yamaha and Ducati
72° (or 75°) and 90° may be tricky to tell if the angle of view is not dead on.





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September 13th, 2012, 03:00 PM   #8
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So not only have they made only a new donk, they have made multiple chassis and swingarms AND have their 2013 bike on the track already. Busy boys in the honda factory. You listening ducati??
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September 13th, 2012, 03:44 PM   #9
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Quote:
Originally Posted by digger View Post
So not only have they made only a new donk, they have made multiple chassis and swingarms AND have their 2013 bike on the track already. Busy boys in the honda factory.



You listening Ducati??


One can only hope. Honda is certainly demonstrating how it's done!
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September 13th, 2012, 04:04 PM   #10
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Quote:
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BUT WHAT ABOUT THE VSG's FOR GODS SAKE!! WONT SOMEONE PLEASE THINK OF THE VSG'S!!!!






Measuring the head gasket angles, I get (edit!) 74.1 degrees.

(This is probably +/- a degree or two. Every time I measure I get s slightly different angle.)

Since we aren't looking straight along the crank axis, dropping our point of view should (right?) have the effect of widening this angle. Maybe 75 or so? Defo not a 90, IMO.



Strangely enough, for a bike running upright, 4 pistons at the indicated angles will produce ~20% MORE of the mythical VSG force than an L90 with two cylinders pointed dead forward and two straight up. Cos(~56) + Cos (~49) > Cos(90) + Cos(0)



Not that it matters. Any Coriolis drag created by the pistons will be 1) very minimal, and 2) self cancelling. (A retreating piston gives back any rotational momentum it absorbed on the upstroke.)
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