Vintage Race Motorcycles galore

[octane]

...from my visit to the Vintage Grand Prix at Millers outside Salt Lake City

Enjoy !

[RidgeRunner]

Nice stuff there!  Thanks for posting.

                                      Ed

[Dakzila]

   Nice!!!!!!

Thanks for sharing..

Ron B.

[TouringComet]

The last few pictures, of the green Vincent HRD, that is a replica of a pre-war Vincent Series A Rapide.  Dan Smith from Vancouver made something like over 90% of the parts.  He makes his own patterns for the castings, has the castings made, and does all the machining himself.  Even some of the parts on a Vincent that were originally bought in, like the Amal carbs, Dan made his own.  This is the same Dan Smith that was the crew chief one year for the Vincent liner, when a group from Canada leased Max Lambky's liner.

Vincent twins have the two connecting rods side by side on the big end.  That gives the uneven firing intervals.  The Series A twins have more space between the flywheels, so Dan redesigned his flywheels, and made them with offset crank pins.  Now the firing interval is even, and it sounds more like a vertical twin than a v-twin.

[High Gear]

Great pictures,

Thanks

[octane]

You're welcome guys !
I, for sure, enjoyed the sights and sounds out there that day.

The last few pictures, of the green Vincent HRD, that is a replica of a pre-war Vincent Series A Rapide.  Dan Smith from Vancouver made something like over 90% of the parts.  He makes his own patterns for the castings, has the castings made, and does all the machining himself.  Even some of the parts on a Vincent that were originally bought in, like the Amal carbs, Dan made his own.  This is the same Dan Smith that was the crew chief one year for the Vincent liner, when a group from Canada leased Max Lambky's liner.

Vincent twins have the two connecting rods side by side on the big end.  That gives the uneven firing intervals.  The Series A twins have more space between the flywheels, so Dan redesigned his flywheels, and made them with offset crank pins.  Now the firing interval is even, and it sounds more like a vertical twin than a v-twin.

yeah; there was a note next to to bike about the build.
I was totally flabbergasted by the quality of his work !


BTW: an one of the races, for small cc Honda's, the did the start 'Le Mans style':
running across the track and push-start the bikes. Very entertaining:

Click the image ( and turn up sound for a short video )



.

[panic]

Re: "That gives the uneven firing intervals"

Let me clarify that a bit.
The irregular firing order is determined by the "V"-angle (the pre-war HRD & Series A cylinder angle is 47.5°, the firing order is 312.5°/407.5°), unless something else is done. The fact that they're side-by-side is coincidental.
A V can have its firing order changed by offsetting the pin so that one rod is "clocked" ahead (or behind) the other. The amount of rotation changes the firing order by its angle. A Series A would require a step in the pin large enough to completely reverse the cylinder angle to fire like a parallel twin at 360° intervals: V angle × stroke length × Pi ÷ 360.
For the original 90mm stroke, this distance is 1.469", or 94% of the pin diameter, so a much larger pin is needed.