Phillip Island

Posted: Thu Feb 04, 2016 4:14 pm

DonR wrote:

krgood0 wrote:

I would not count a Bike powered by a pushrod British V twin first produced in the 1940's a cheater bike Don, Hat's off to the builders of the Bike and the Aussie who beat all the more modern Jap bikes

Keith, that Vincent is about as English as I am. The bike has been completely re-engineered and can be anywhere from 1300-1600cc with cylinder heads that look original only from the outside. That said, it's beautiful, fast, reliable and very well done but there are rumblings in the paddock about how it got included.

Quote from http://www.irvingvincent.com/about_us

Quote:

The basic engine and motorcycle design was taken from the original 1946 Phil Irving design. Then the engine and all components were fully redrawn by Ken Horner applying modern technology improvements which amounted to an increase of over 120 brake horse power from the original design. KH Equipment produced everything except the brakes, wheels and suspension.

It took three years of re-engineering, CAD drawing, pattern making, casting and machining to complete this superb machine. The Irving Vincent's classic good looks and race-winning performance have proved it was time very well spent.

I suppose nobody complained about FJ motors being allowed?

Posted: Thu Feb 04, 2016 7:45 pm

I have been told the FJ1200's on the US team were 180hp reliable, 200 and you take you chances. Also that there ran better with the lower fairing removed, I guess there is a heat issue.

Maybe T-Rex already had this figured out, if you can find it a recent Classic Racer featured the T-Rex Harris Honda reviewed by Alan Cartcart. The one interesting thing I found was the rear shock angle. The shock was positioned so that the distance from the swingarm pivot to lower shock mount matches the distance from the swingarm pivot to upper shock mount.

Most lay down shocks to create a progressive spring rate.

CB1100F Joined: Feb 17, 2009 Posts: 2105 Location: Oz

Progressive suspension movement is beneficial for motocrossers landing from big jumps. For road racing and the limited suspension movement this is not desirable and in fact can make matching spring and damping rates problematic.

What amazes me the most about the T-Rex is its
ability to cut race winning laps with such a spindly looking swing arm.

Posted: Thu Feb 04, 2016 11:36 pm

DonR wrote:

For road racing and the limited suspension movement this is not desirable and in fact can make matching spring and damping rates problematic.

I disagree entirely, rising rate "is" very desirable and matching spring and damper rate is not any more difficult than conventional non rising rate set-ups.

Captain

CB1100F Joined: Feb 17, 2009 Posts: 2105 Location: Oz

Team USA want to get serious.

http://magazine.cyclenews.com/i/634995-cycle-news-2016-issue-04-february-2/66

Posted: Thu Feb 04, 2016 11:54 pm

Dudes, if Schwants , Polen, Scott, and Jay Springsteen (that is fucking AWESOME!) show up, it's a done deal if the equipment holds up.

Posted: Fri Feb 05, 2016 12:04 am

DonR wrote:

Progressive suspension movement is beneficial for motocrossers landing from big jumps. For road racing and the limited suspension movement this is not desirable and in fact can make matching spring and damping rates problematic.

What amazes me the most about the T-Rex is its
ability to cut race winning laps with such a spindly looking swing arm.

I am going out on a limb but think this is a CMR version of the XR69 Suzuki, CrMo 4130 swingarm. The solo shock requires all the bracing.

T-Rex Honda uses a twin shock but the lower mount is very near the axel, amounts to similar support.

I know Denis at CMR swears by the steel arms, he won't produce aluminium ones.

CB1100F Joined: Feb 17, 2009 Posts: 2105 Location: Oz

1100russ wrote:

Dudes, if Schwants , Polen, Scott, and Jay Springsteen (that is fucking AWESOME!) show up, it's a done deal if the equipment holds up.

It's what I called for here. I just hope it comes off. Schwantz and Fast Freddie will be at the Barry Sheene next month so I'll bend their ear about it Wink