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Author Topic: MPH , RPM's and Gearing  (Read 785 times)

prof_stack

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MPH , RPM's and Gearing
« on: September 11, 2010, 05:24:06 PM »
While slacking off from grading some math quizzes, I put this together for fun.  I believe it is the gearing for the C5.  Is the G5 the same?

                              RPM
    1,000    2,000    3,000    4,000    5,000    5,250
1:       5        11       16         21        26        28
2:       8        16       24         32         40       42
3:     11        21       32         43         53       56
4:     13        27       40         53         67       70
5:     16        32       49         65         81       85
                      MILES PER HOUR
A Royal Enfield owner's cup is always half full.

BRADEY

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Re: MPH , RPM's and Gearing
« Reply #1 on: September 12, 2010, 06:59:43 AM »
Hello Professor,
How have you calculated this. Have you done it manually or otherwise.
Thanks for a response. Cheers.

prof_stack

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Re: MPH , RPM's and Gearing
« Reply #2 on: September 12, 2010, 04:44:57 PM »
Bradey, I used the figures for 1k for each gear posted recently (can't remember the thread, sorry) and extrapolated for the rest of the rpm's. 

Here is an updated version with the limiter at 5.5k rpm's, according to Kevin M's post yesterday:


             RPM
   1k  2k  3k  4k  5k 5.5K
 1  5  11  16  21  26  29
 2  8  16  24  32  40  44
 3 11  21  32  43  53  59
 4 13  27  40  53  67  73
 5 16  32  49  65  81  89
       MILES PER HOUR
A Royal Enfield owner's cup is always half full.

enfield freddy

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Re: MPH , RPM's and Gearing
« Reply #3 on: September 12, 2010, 07:10:12 PM »
I have a excel s/sheet for the 4 speeder models , allows you to alter tyre sizes , gearbox cogs and engine cogs , as well as setting the max RPM

anyone needs a copy , or could host it , please PM me
arthritis hurts at my age!

singhg5

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Re: MPH , RPM's and Gearing
« Reply #4 on: September 12, 2010, 10:51:56 PM »
BRADEY:

Here is one of the programs / spread sheets that can calculate values of RPM, Gear and Speed.  The values for C5 were done by Quinn (qgolden on this Forum) a few weeks back using this spread sheet.   Anyone can enter the values.  Here is the link -

             http://woodsware.aciwebs.com/gears/gears.asp

singhg5

Hello Professor,
How have you calculated this. Have you done it manually or otherwise.
Thanks for a response. Cheers.
« Last Edit: September 12, 2010, 11:44:05 PM by singhg5 »
1970's Jawa /  Yezdi
2006 Honda Nighthawk
2009 Royal Enfield Black G5

qgolden

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Re: MPH , RPM's and Gearing
« Reply #5 on: September 15, 2010, 12:28:12 PM »
Using the Data Calculated a few weeks ago, I put little white dots on the face of my speedo at the max RPM Values for each speed in each gear.  Gives me a mental   ::) reference to peak torque/HP in each gear. 
Any other Enfields in New England?