Author Topic: Altered frame rules  (Read 2566 times)

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Offline Sequim Jim

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Altered frame rules
« on: February 18, 2018, 09:57:17 AM »
Hi,
I'm building a BMW R100RT (airhead) to race in the APS-PF class. The frame is my own design, along with the chain drive conversion. Do I need to have the frame pre-inspected before Bonneville? I probably will not bring the bike I rode last year. Do I keep the same racing number or do I need to have another number assigned to my new bike?
Best regards
Jim

Offline Stainless1

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  • Robert W. P. "Stainless" Steele
Re: Altered frame rules
« Reply #1 on: February 18, 2018, 10:34:07 AM »
SCTA or AMA
If SCTA you will need a new log book and frame sticker... Your number is yours, not the vehicle's.
Stainless
Red Hat 228.039, 2001, 65ci, Bockscar Lakester #1000 with a little N2O

Offline donpearsall

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Re: Altered frame rules
« Reply #2 on: February 18, 2018, 12:31:01 PM »
I have built bodywork similar to what you have drawn. I just wanted to compliment you on your sketching skills!
Also, make sure you can see straight ahead. You may have to raise your head a bit more.

Don
550 hp 2003 Suzuki Hayabusa Land Speed Racer

Offline Sequim Jim

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Re: Altered frame rules
« Reply #3 on: February 19, 2018, 09:27:22 AM »
Thanks everybody!
One of my friends sent an email telling me the same thing. I was considering bringing two bikes but he said it's a lot of work, so I will have to decide whuch bike to going to Utah this year.
The BMW has been slightly changed and I'm having problems getting parts from Germany, so we'll see how things go.
Best regards
Jim

Offline wobblywalrus

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Re: Altered frame rules
« Reply #4 on: February 19, 2018, 10:12:49 AM »
It looks like it would be a lot more comfortable if the knees are moved back behind the cyl heads.

Offline bones

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Re: Altered frame rules
« Reply #5 on: February 19, 2018, 05:36:34 PM »
I have been helping a mate here in Australia with an air head BMW for the same class.
It looks like you have taken a chain off the diff to the rear wheel. Unfortunately a lot of HP is used in the diff.
My mate has turned the engine 90* and used a TT Industries Norton box with a belt primary.
Turning the engine has not helped the width but it is a more efficient drive train.
Last year at Gairdner he ran a very easy 135.
We will see how it goes in a few weeks.

Like Wobbly said-- If you could move your foot rests back and also your seat, you may be able
to flatten your back, better aero,
I will get a picture and see how I go loading it.


cheers     Bones

Offline grumm441

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Re: Altered frame rules
« Reply #6 on: February 22, 2018, 04:21:39 PM »

It looks like you have taken a chain off the diff to the rear wheel. Unfortunately a lot of HP is used in the diff.


cheers     Bones

There's no differential in there
It's a final drive
G
Chief Motorcycle Steward Dry Lakes Racers Australia Inc
Spirit of Sunshine Bellytank Lakester
https://www.dlra.org.au/rulebook.htm