jtreadway Posted May 16, 2013 Share Posted May 16, 2013 This is really interesting, very clear explanation. Link to comment Share on other sites More sharing options...
Member Contributer Switchblade Posted May 16, 2013 Member Contributer Share Posted May 16, 2013 Alway knew that but the music notes was interresting..... To bad were not two strokes..... Link to comment Share on other sites More sharing options...
Member Contributer 2thdr Posted May 16, 2013 Member Contributer Share Posted May 16, 2013 very cool! People with musical brains are so smart... Link to comment Share on other sites More sharing options...
Member Contributer KevCarver Posted May 16, 2013 Member Contributer Share Posted May 16, 2013 Pretty effing cool! Link to comment Share on other sites More sharing options...
jtreadway Posted May 16, 2013 Author Share Posted May 16, 2013 Hmmm, maybe this doesn't exactly apply to the VFR1200. Product specs say "The VFR1200F engine also incorporates a special high-strength Symmetrically Coupled Phase-shift Crankshaft that features a 28-degree crankpin offset that works in concert with the 76-degree Vee angle to essentially negate primary engine vibration for smooth running" Does anybody know what "Symmetrically Coupled Phase-shift Crankshaft that features a 28-degree crankpin offset" means? I'm assuming it means the 1200 is not a 180 degree crankshaft, so the audio bit is not representative of the 1200 engine? Link to comment Share on other sites More sharing options...
Noobtastic14 Posted May 16, 2013 Share Posted May 16, 2013 This. Is. Awesome. Thank you for posting! -Drew Link to comment Share on other sites More sharing options...
tiki01 Posted May 16, 2013 Share Posted May 16, 2013 Interesting breakdown. Even I could follow it. And it starts with an image of the best gen VFR so you knew it would be good! Link to comment Share on other sites More sharing options...
sorin128 Posted May 16, 2013 Share Posted May 16, 2013 So that explains the pleasure of hearing the engine every time I start the bike ! It seems that this bike got some rhytm , no doubt about it ! :) Link to comment Share on other sites More sharing options...
ilprofessore Posted May 16, 2013 Share Posted May 16, 2013 Hmmm, maybe this doesn't exactly apply to the VFR1200. Product specs say "The VFR1200F engine also incorporates a special high-strength Symmetrically Coupled Phase-shift Crankshaft that features a 28-degree crankpin offset that works in concert with the 76-degree Vee angle to essentially negate primary engine vibration for smooth running" Does anybody know what "Symmetrically Coupled Phase-shift Crankshaft that features a 28-degree crankpin offset" means? I'm assuming it means the 1200 is not a 180 degree crankshaft, so the audio bit is not representative of the 1200 engine? Please see this article http://www.vfritaliaclub.it/node/2425 It is in italian, but go down some screens and you can see an animation of 1200 engine showing what is called "Symmetrically Coupled Phase-shift Crankshaft that features a 28-degree crankpin offset" Link to comment Share on other sites More sharing options...
timmythecop Posted May 16, 2013 Share Posted May 16, 2013 I love when people sit and figure things out for my little monkey brain. Link to comment Share on other sites More sharing options...
donnykaboom Posted May 16, 2013 Share Posted May 16, 2013 Hmmm, maybe this doesn't exactly apply to the VFR1200. Product specs say "The VFR1200F engine also incorporates a special high-strength Symmetrically Coupled Phase-shift Crankshaft that features a 28-degree crankpin offset that works in concert with the 76-degree Vee angle to essentially negate primary engine vibration for smooth running" Does anybody know what "Symmetrically Coupled Phase-shift Crankshaft that features a 28-degree crankpin offset" means? I'm assuming it means the 1200 is not a 180 degree crankshaft, so the audio bit is not representative of the 1200 engine? if you parse out "symmetrically coupled phase-shift crankshaft " you may be able to figure out what that means. i'm still working on parse Link to comment Share on other sites More sharing options...
Member Contributer CornerCarver Posted May 16, 2013 Member Contributer Share Posted May 16, 2013 FREAKIN AWESOME....thanks for posting this! re: the symetrically coupled phase-shifting crnk on teh 1200, what that means is that even though your cylinders are not spaced 90* like previousl Honda V4's the engine still maintins perfect primary and secondary balance because the crank pins are offset enough to fool the rotating mass into believing that it is a 90* V4. Link to comment Share on other sites More sharing options...
Member Contributer eastbowl2 Posted May 16, 2013 Member Contributer Share Posted May 16, 2013 That's a great video. Thanks for posting. Since the 1200 has a different firing pattern, it definitely sounds different. Taking cylinder 1 (for no particular reason) as the starting point, it goes 104 degrees, 256 degrees, 104 degrees, 256 degrees. Converting that to music notation, it roughly corresponds to eighth notes as well (close enough) but the pattern is different. Counting it out, it is like this (with the BANGS in capitals) (and I'm counting the music notes, not cylinders here): ONE and two AND THREE and four AND ONE and two AND THREE and four AND.... Link to comment Share on other sites More sharing options...
Member Contributer BusyLittleShop Posted May 16, 2013 Member Contributer Share Posted May 16, 2013 I love it when people visually explain something in detail... I hope the person will do one for the 360º crank V4 thats in the RC30 / RC45... Link to comment Share on other sites More sharing options...
Member Contributer YoshiHNS Posted May 16, 2013 Member Contributer Share Posted May 16, 2013 Hmmm, are either end of that V8 model a representation of a 360 degree crank? Link to comment Share on other sites More sharing options...
Member Contributer dr.toto Posted May 16, 2013 Member Contributer Share Posted May 16, 2013 To the best of my memory, the pre 1986 models all had 360 degree cranks. Link to comment Share on other sites More sharing options...
Member Contributer dgordon Posted May 16, 2013 Member Contributer Share Posted May 16, 2013 Excellent post! Thanks for helping my feeble mind understand,, Link to comment Share on other sites More sharing options...
The Phantom Posted May 17, 2013 Share Posted May 17, 2013 Hmmm, are either end of that V8 model a representation of a 360 degree crank? Yep that is a 360 degree V8 - the most typical type. 350 Chev, 351 Ford etc. A 180 degree V8 has a flat plane crank and is generally found in the high end stuff like Ferrari or bespoke racing motors, it's called a flat plane crank V8 because all four big end journals lie in the same plane, whereas a crossplane or 360 crank has journals at 0, 90, 180 and 270 degrees. Great visual and audio representation of how the VFR crank and firing order works! Link to comment Share on other sites More sharing options...
Member Contributer Bassie Posted May 17, 2013 Member Contributer Share Posted May 17, 2013 Cool, I knew there was something different about the sound, but never knew what it was. Now I do, thanks! Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.