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Author Topic: Motorcycle speed in gears  (Read 38284 times)
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Stainless1
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Robert W. P. "Stainless" Steele Wichita, Kansas



« Reply #15 on: December 20, 2014, 11:11:15 PM »

1  53.1
2  71.3
3  89.9
4 107.9
5 123.7
6 140.4
Max at 13500 in each gear, no slip compensation
I will send you an excel file that does the math if you would like... we have used it successfully for 20 years.
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Stainless
Red Hat 228.039, 2001, 65ci, MSA Bockscar Lakester with a little N20 
MSA Bockscar Lakester #1000 my fastest mile 245 and change, 84 ci turbobusa motor... but Corey's 233 MPH H/BFL record is still 3MPH faster than mine.
sofadriver
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« Reply #16 on: December 21, 2014, 12:11:26 AM »


I will send you an excel file that does the math if you would like.

I think you already did it all !
Thank you.

As little power as I have, I think a little slippage on the way might help me hit 13,500 rpm in 6th!
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Mike in Tacoma

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« Reply #17 on: December 21, 2014, 04:40:52 AM »

i just done the calculations based on the info you posted (assumed stated final drive as primary), along with the formula i provided, result  140.56mph, (6th),,  smiley
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First Australian to ride a motorcycle over 200mph at Bonneville,,,
sofadriver
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« Reply #18 on: December 21, 2014, 05:29:25 AM »

140 it is!

Thanks all   cheers
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Mike in Tacoma

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« Reply #19 on: December 21, 2014, 08:50:01 AM »

Most of the tires I have used are in the 25 to 25.5 diameter
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Sumner
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« Reply #20 on: January 14, 2015, 03:00:21 PM »

Have you tried the gearing calculator that Sumner put together? It allows you change sprockets to compare in addition to transmission gears. It's down 2 threads here.

Here is a screen shot...



...and besides the option to view multiple rear sprocket combintains at once as mentioned above (blue arrow area) you....



... can also see the speeds in any gear at any rpm without having to reload the rpm over and over.  Also another helpful thing is that you can see the rpm drop after a shift in any gear and the new rpm in the next gear which can help determine if you are falling out of the torque/HP curve after the shift.

It is not interactive online so that is a negative but download it here...

http://purplesagetradingpost.com/sumner/bvillecar/bville-spreadsheet-index.html

... and then use it (go down the menu a short ways to the motorcycle spreadsheets.  If you don't have a spreadsheet program consider downloading Open Office....

https://www.openoffice.org/

...it is free and what I use (I do donate from time to time to them),

Sumner

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Sumner
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« Reply #21 on: January 14, 2015, 03:28:08 PM »

I came late to this thread but sitting down in FL all nice and warm thought I'd run the numbers also and basically came up with the same as above or about 138.4 mph for the inputs...



and you can see the rpm drop in each gear below if you shift in the 12,000 to 13000 range but pick what you would actually use....



Sum

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Nortonist 592
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« Reply #22 on: January 23, 2015, 02:34:04 AM »

I use the the Bonneville formula to calculate speed.  Really simple.  Make a run, go back and collect timing slip and bingo you have your speed.  This formula takes into account tire growth, wheel slippage and is 100% accurate.
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Sumner
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« Reply #23 on: January 25, 2015, 10:49:25 AM »

I use the the Bonneville formula to calculate speed.  Really simple.  Make a run, go back and collect timing slip and bingo you have your speed.  This formula takes into account tire growth, wheel slippage and is 100% accurate.


 cheers cheers grin grin

Sum
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sofadriver
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« Reply #24 on: January 25, 2015, 11:07:24 AM »

I use the the Bonneville formula to calculate speed.  Really simple.  Make a run, go back and collect timing slip and bingo you have your speed.  This formula takes into account tire growth, wheel slippage and is 100% accurate.


 cheers cheers grin grin

Sum

Yeah, I know.
You never really know until it's done.
I have to prepare to be in the ballpark.
I'm obsessing about all this stuff (you guys don't know the half of it!) but..........it's what I do.  rolleyes  grin
« Last Edit: January 25, 2015, 11:09:31 AM by sofadriver » Logged

Mike in Tacoma

"aww, what the hell - let's just do it".............

100cc APS/G #833
Stainless1
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« Reply #25 on: January 25, 2015, 12:38:55 PM »

It's OK... a little research to figure out where to start is something we all do... some more obsessively than others.  It is a balance of what you want and what you need... getting there is the hard part... and the fun part... and the part that makes you crazy...
The time between races stirs the crazy pot...  cheers
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Stainless
Red Hat 228.039, 2001, 65ci, MSA Bockscar Lakester with a little N20 
MSA Bockscar Lakester #1000 my fastest mile 245 and change, 84 ci turbobusa motor... but Corey's 233 MPH H/BFL record is still 3MPH faster than mine.
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« Reply #26 on: January 27, 2015, 12:50:17 AM »

Salt time is valuable and getting hard to come by so being half way prepared can secure that record.  you never know when the rain will come. 

Jon
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« Reply #27 on: January 27, 2015, 08:10:16 AM »

Salt time is valuable and getting hard to come by so being half way prepared can secure that record.  you never know when the rain will come. 

Jon

x2


When the time comes, you need to be ready enough to roll up to the line, and run a speed/time that is in your "ballpark".    Otherwise you are just wasting your (probably limited) resources.   Small changes or tuning to equal/exceed your class record can then be implemented.

That, in a nutshell, is the whole point of "planning".

BTW, "implementation" infers the execution of a decision or plan.    Those who "fail to plan", simply "plan to fail".    (W. Churchill)    The BEST race teams I'm aware of: PLAN OBSESSIVELY . . . .  go figure . . . . .

Pro teams that run less than competitively "right off the trailer" spend their race weekends playing "catch up".    Trust me, nobody on those teams is happy about it . . . . . .  especially if . . .   Dead Horse

What say you Krusty?
 cheers
Fordboy
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« Reply #28 on: March 28, 2017, 07:27:37 AM »

Where is a good place to buy rear sprockets?
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Best regards
Jim
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« Reply #29 on: March 28, 2017, 08:05:42 AM »

Try PBI sprockets and they are in Oregon
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