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Dusty's Bonneville Scout Build

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Dusty-Dave

Posts: 887

Joined: Tue Oct 12, 1999 12:01 am

Location: Ojo Caliente,NM,USA

Post Fri Jun 27, 2014 11:04 pm

Dusty's Bonneville Scout Build

This madness started last year when Tom who is a member of our Friday gear head lunch group and who goes to Bonneville most every year to either race or officiate tossed me a copy of last years SCTA rule book and asked if I thought there was a class I thought I could be competitive in. He had underlined a few that he thought I might be interested in considering that most of my bikes are Indians
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After reading and rereading the rules book I finally decided this spring that a Bonneville effort would be a good way to spend the next few years of My retirement. After much discussion I am maybe positive that I want to build an AVBF A being a special construction frame which will allow me to get the head stock as low as possible with the 16" rims I chose. The rules allow as small as 15" rims but the cost and availability of tires and rims and the fact that I had a new w speed rated 16" tire made me settle on 16 inches. V is vintage engine produced before 1956 with a 33.33% size advantage given to flatheads. B is blown and F is fuel. Right now the plan is to run Nitrous oxide and alcohol through fogers because of a flatheads notoriously poor breathing even if blown. I started looking for parts this spring Got a pair of 16" 250 Ninga rims and fork and today I won a set of 37 Sport Scout cases. So it will be a 1937 Sport Scout.

Still haven't picked a displacement a 45" stock displacement Scout would run in 500 cc the ABVF record is 73.903 but the 500 cc AVF record is 111.839 so the blown speed should go way up soon and a 57" stroker would run in 650 No record for ABVF but AVF is 144.531. Leaving it a 45 would give me lots more room for piston squirters but would require a pair of std. bore cylinders but I just prefer 57 inchers and the cylinders could be way oversize per the rules.

Main thing I need to find next is a pair of cylinders I would really like to buy new ones but the rules require original cases and cylinders or exact reproductions and only ones I can find so far say improved ports and the rules committee says not no but hell no. I hear that there are exact repros but can’t find anyone selling one that will offer any documentation and at $1500.00 to $2000.00 I sure don’t want a pair of paper weights.

I’ve been promising to start writing this up for a while but having the cases and being able to assign a year to the build finally got me moving. Stay tuned
Dusty
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Pa

Site Admin

Posts: 4754

Joined: Sun Mar 12, 2000 1:01 am

Location: Ohio USA

Post Sat Jun 28, 2014 12:55 pm

Re: Dusty's Bonneville Scout Build

Now we are talking !! :D Thanks for starting the build topic Dusty. Beats me why a cylinder manufacturer would not document by providing paperwork. Don't they wish to make a sale ?
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Dusty-Dave

Posts: 887

Joined: Tue Oct 12, 1999 12:01 am

Location: Ojo Caliente,NM,USA

Post Mon Jun 30, 2014 6:24 pm

Re: Dusty's Bonneville Scout Build

Got my cases today they are as advertised. Need lots of cleaning. a small weld and a custom sized rocker arm pivot.

Definitely a 37 high performance Scout with a Magneto and the y cylinders and manifold.

[imgImage][/img]

Will need a small weld where the cylinder base mates.
Image[/url][/img]

Need to extract one broken bolt
Image[/URL][/img]

Need a slightly oversize rocker arm pivot
Image[/URL][/img]
All in all a great pair for being 77 years old.
Dusty
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Pa

Site Admin

Posts: 4754

Joined: Sun Mar 12, 2000 1:01 am

Location: Ohio USA

Post Mon Jun 30, 2014 8:40 pm

Re: Dusty's Bonneville Scout Build

Dusty....I'm no Indian engine numbers expert but are you sure those are ok ?
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Dusty-Dave

Posts: 887

Joined: Tue Oct 12, 1999 12:01 am

Location: Ojo Caliente,NM,USA

Post Mon Jun 30, 2014 9:39 pm

Re: Dusty's Bonneville Scout Build

Pa wrote:Dusty....I'm no Indian engine numbers expert but are you sure those are ok ?

For 37 they probably are but since It's never gonna be on the street so not a problem. If 38 and older were all straight and even or didn't match the MY that's off the pad I would be worried. 39 or so they started using something that held the numbers straight and even.
Dusty
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Pa

Site Admin

Posts: 4754

Joined: Sun Mar 12, 2000 1:01 am

Location: Ohio USA

Post Sun Aug 03, 2014 10:07 am

Re: Dusty's Bonneville Scout Build

Any more progress on the build Dusty ?
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Dusty-Dave

Posts: 887

Joined: Tue Oct 12, 1999 12:01 am

Location: Ojo Caliente,NM,USA

Post Sat Aug 09, 2014 11:42 am

Re: Dusty's Bonneville Scout Build

Nope no progress except for biding on parts, I been getting ready to go to Bonneville to learn my way around and building a Moto Guzzi Chop. But they cancelled Speed Week this morning so I guess it's bock on my head.
Dusty
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Pa

Site Admin

Posts: 4754

Joined: Sun Mar 12, 2000 1:01 am

Location: Ohio USA

Post Sat Aug 09, 2014 1:14 pm

Re: Dusty's Bonneville Scout Build

I understand that Bro. I waited to even begin building my wla until I had almost all of the parts gathered up. It seemed like it took forever to gather up the parts. Oh wait....It did take forever. :lol:
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ralph

Posts: 23

Joined: Sun Dec 19, 2010 6:36 pm

Post Sun Aug 10, 2014 4:22 am

Re: Dusty's Bonneville Scout Build

Dusty,
Did you say motorcycle speed week has been cancelled?
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Dusty-Dave

Posts: 887

Joined: Tue Oct 12, 1999 12:01 am

Location: Ojo Caliente,NM,USA

Post Sun Aug 10, 2014 9:42 am

Re: Dusty's Bonneville Scout Build

ralph wrote:Dusty,
Did you say motorcycle speed week has been cancelled?

All of speed week is under water. The Salt Flats are not a dry lake this week! http://www.scta-bni.org/
Dusty
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Dusty-Dave

Posts: 887

Joined: Tue Oct 12, 1999 12:01 am

Location: Ojo Caliente,NM,USA

Post Sun Aug 10, 2014 10:16 am

Re: Dusty's Bonneville Scout Build

While I was looking for Bonneville info I stumbled into this. http://www.motorcycle-usa.com/321/18966 ... Death.aspx Kinda on thread I guess.
Dusty
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Pa

Site Admin

Posts: 4754

Joined: Sun Mar 12, 2000 1:01 am

Location: Ohio USA

Post Sun Aug 10, 2014 6:52 pm

Re: Dusty's Bonneville Scout Build

Does this mean it was flooded out ?
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Dusty-Dave

Posts: 887

Joined: Tue Oct 12, 1999 12:01 am

Location: Ojo Caliente,NM,USA

Post Mon Aug 11, 2014 7:04 pm

Re: Dusty's Bonneville Scout Build

Pa wrote:Does this mean it was flooded out ?

Yep!
Dusty
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ralph

Posts: 23

Joined: Sun Dec 19, 2010 6:36 pm

Post Tue Aug 12, 2014 4:46 am

Re: Dusty's Bonneville Scout Build

Motorcycle speed week is August 23-28,hopefully it will be dried out by then.
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Dusty-Dave

Posts: 887

Joined: Tue Oct 12, 1999 12:01 am

Location: Ojo Caliente,NM,USA

Post Tue Aug 12, 2014 9:34 am

Re: Dusty's Bonneville Scout Build

ralph wrote:Motorcycle speed week is August 23-28,hopefully it will be dried out by then.

The AMA stuff doesn't have a Vintage class or give a break to flatheads so doesn't interest me. The SCTA is more in line with what I want to do.
Dusty
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Lee W

Posts: 141

Joined: Sat Sep 23, 2006 8:58 pm

Location: Carver, MN

Post Wed Aug 13, 2014 2:42 pm

Re: Dusty's Bonneville Scout Build

Dusty, the AMA "Motorcycle Speed Trials" (formerly the BUB Speed Trials) does have a full range of classes for vintage bikes. Four divisions based on fuel or gas and supercharged fuel or supercharged gas. Then each of those is further broken down into eight possible classes by frame modifications and streamlining. Then those 32 possible classes are further broken down by engine size.

Unfortunately it does appear that you are correct about there being no size advantage given to flatheads. Too bad.

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