Landracing Forum

Bonneville Salt Flats Discussion => SCTA Rule Questions => Topic started by: Hoody on April 12, 2013, 03:18:23 PM

Title: Vintage bike age limit cut off?
Post by: Hoody on April 12, 2013, 03:18:23 PM
Quick question, Probably missed this somewhere? but does anyone know the ages cutoff for bikes running in the vintage class?

Thnx
Title: Re: Vintage bike age limit cut off?
Post by: Stainless1 on April 12, 2013, 03:46:40 PM
Built prior to 1956  7.J. 10
Title: Re: Vintage bike age limit cut off?
Post by: Hoody on April 12, 2013, 03:51:40 PM
Great, Thnx for the help.
Title: Re: Vintage bike age limit cut off?
Post by: 46champ on April 17, 2013, 10:43:19 PM
Isn't there a little more to it than that.  As I understand it the 1956 refered to in the rule book is model year 1956 not year 1956.  So if you have a Harley Sportster built in the fall of 1955 you are not leagle.
Title: Re: Vintage bike age limit cut off?
Post by: desotoman on April 17, 2013, 11:22:28 PM
Years ago it was prior to 1957 motor, but the rules got changed to prior to 1956 to eliminate the Sportster. At least that is what I remember. If I am wrong I will be corrected.

Tom G.
Title: Re: Vintage bike age limit cut off?
Post by: Stainless1 on April 18, 2013, 10:38:54 AM
Quote from: 46champ on April 17, 2013, 10:43:19 PM
Isn't there a little more to it than that.  As I understand it the 1956 refered to in the rule book is model year 1956 not year 1956.  So if you have a Harley Sportster built in the fall of 1955 you are not leagle.

Since Sportsters were first introduced in 1957 that is not an issue.. if you have a 55 you used the time machine a long time ago....
Thus 1956 to eliminate the sportster
Title: Re: Vintage bike age limit cut off?
Post by: Dakin Engineering on April 18, 2013, 08:34:37 PM
It is my unqualified interpretation that side valves are vintage.
Prior to 1957, unitized Harleys were K models.
With the advent of overhead valves, the Sportster was born.

IMHO,
Sam
on a Sportster
Title: Re: Vintage bike age limit cut off?
Post by: panic on April 19, 2013, 04:37:44 PM
The K model stayed in production until 1969 as the KR.
The Sportster began manufacture in mid-1956 for the 1957 model year, traditionally announced in August or September of the prior year.
There are big improvements to the KR in 1954 and 55, but these can be retro-fit to earlier without surgery. An argument can be made that the 1957-67 KR was substantially unchanged, and offers no advantage compared to pre-56 and should be legal, but the 1968-69 were very different.
The 45" flathead "G" motor (mechanically equivalent to the earlier "W" = lowest performace model) continued production through 1973, but again there were no changes offering an advantage in the 1957-73 models.

My credentials? Shameless self-promotion:
http://www.victorylibrary.com/45PER.htm
(http://victorylibrary.com/graphics/45PER-cvr-300.jpg)