Landracing Forum

Bonneville Motorcycle Speed Trials => Bville Motorcycle Speed Trials Rules Questions => Topic started by: 1gsxrclosertodivorce on January 26, 2010, 12:37:18 AM

Title: Vintage gasoline class question.
Post by: 1gsxrclosertodivorce on January 26, 2010, 12:37:18 AM

The rule book says....

12.I. VINTAGE: GASOLINE “VG” *
Motorcycle engines production date prior to 1956. Flathead, OHV,
and 2 stroke engines must retain the O.E.M. Heads, Cylinders, and
Crankcases originally installed at time of factory production.
Allowable overbore in this class is .050” (inch).
GASOLINE ONLY. See section 2.F.

My question...

Are there any limitations on modifications (obviously not a supercharger or turbocharger), both internal and external that can be made to "the O.E.M. Heads, Cylinders, and crankcases originally installed at time of factory production"?

Thanks in advance,

Andy

Title: Re: Vintage gasoline class question.
Post by: Stainless1 on January 26, 2010, 01:09:35 PM

multiple answers to your question, depends on class...
Production... no external changes, all the internal you want
Modified, Altered and Special Construction Streamliner... all the internal and external changes you want...
You can run them blown in all but production.
Anyone have a different take?

Title: Re: Vintage gasoline class question.
Post by: saltwheels262 on January 26, 2010, 06:23:27 PM

that sounds about right.

franey

Title: Re: Vintage gasoline class question.
Post by: wobblywalrus on January 26, 2010, 10:23:21 PM

Stainless is pretty accurate.  In addition, the displacement after the mods must be appropriate for the class.

Title: Re: Vintage gasoline class question.
Post by: panic on January 30, 2010, 10:19:42 AM

Not sure if that exact wording is new?
The rules as I remember them specified original heads and cases (but not barrels) for OHV, original cylinders and cases (but not heads) for side-valve, yes?

Title: Re: Vintage gasoline class question.
Post by: 1gsxrclosertodivorce on February 02, 2010, 12:37:50 AM

That quote is from the 09 rule book :cheers:

Cheers,

Andy