Board index Flathead Power-Technical Questions, Answers, and Suggestions Indians Dusty's Bonneville Scout Build

Dusty's Bonneville Scout Build

Moderators: Curt!, Pa

Post Fri Jun 27, 2014 11:04 pm

Posts: 1028
Location: Ojo Caliente,NM,USA
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

Post Sat Jun 28, 2014 12:55 pm
Pa Site Admin

Posts: 5798
Location: Ohio USA

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 ?

Post Mon Jun 30, 2014 6:24 pm

Posts: 1028
Location: Ojo Caliente,NM,USA
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.

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Will need a small weld where the cylinder base mates.
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Need to extract one broken bolt
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Need a slightly oversize rocker arm pivot
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All in all a great pair for being 77 years old.
Dusty

Post Mon Jun 30, 2014 8:40 pm
Pa Site Admin

Posts: 5798
Location: Ohio USA

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

Post Mon Jun 30, 2014 9:39 pm

Posts: 1028
Location: Ojo Caliente,NM,USA
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

Post Sun Aug 03, 2014 10:07 am
Pa Site Admin

Posts: 5798
Location: Ohio USA

Any more progress on the build Dusty ?

Post Sat Aug 09, 2014 11:42 am

Posts: 1028
Location: Ojo Caliente,NM,USA
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

Post Sat Aug 09, 2014 1:14 pm
Pa Site Admin

Posts: 5798
Location: Ohio USA

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:

Post Sun Aug 10, 2014 4:22 am

Posts: 56
Dusty,
Did you say motorcycle speed week has been cancelled?

Post Sun Aug 10, 2014 9:42 am

Posts: 1028
Location: Ojo Caliente,NM,USA
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

Post Sun Aug 10, 2014 10:16 am

Posts: 1028
Location: Ojo Caliente,NM,USA
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

Post Sun Aug 10, 2014 6:52 pm
Pa Site Admin

Posts: 5798
Location: Ohio USA

Does this mean it was flooded out ?

Post Mon Aug 11, 2014 7:04 pm

Posts: 1028
Location: Ojo Caliente,NM,USA
Pa wrote:
Does this mean it was flooded out ?

Yep!
Dusty

Post Tue Aug 12, 2014 4:46 am

Posts: 56
Motorcycle speed week is August 23-28,hopefully it will be dried out by then.

Post Tue Aug 12, 2014 9:34 am

Posts: 1028
Location: Ojo Caliente,NM,USA
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

Post Wed Aug 13, 2014 2:42 pm

Posts: 151
Location: Carver, MN

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.

Post Mon Nov 24, 2014 4:00 pm

Posts: 1028
Location: Ojo Caliente,NM,USA
Got the flywheels Truett & Osborn made special for this bike this morning. They are stock stroke with rod bores to take a Sportster rod pin and rods.I have decided that it's going to be a blown fuel 45 so it will run in 500cc AVBF. Still haven't found a front cylinder yet but have a very good rear now.
Dusty
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Post Tue Nov 25, 2014 8:02 am
Pa Site Admin

Posts: 5798
Location: Ohio USA

Man those look good Dusty !!

Post Tue Nov 25, 2014 2:49 pm

Posts: 14
If using original barrels they need to be magnified and x-rayed as old faults and fatigue hard to locate per Doc Batsleer and others in vintage class. You may want to clarify what Enfield racing means by altered port and if porting is allowed in class.

Post Tue Nov 25, 2014 10:52 pm

Posts: 1028
Location: Ojo Caliente,NM,USA
Dam near $500.00 worth of internal engine parts. Soon as I get a set of early Sporty rods the lower end can go thgether.
Dusty
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