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Author Topic: Question on Maximum RPM's  (Read 2288 times)

qgolden

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Re: Question on Maximum RPM's
« Reply #15 on: July 29, 2010, 03:11:43 AM »
OK, did some more research and worked that out for myself.

REPozer, while I can appreciate and even envy folks like yourself who can get by with that logic (and it is perfectly logical) I am way to anal retentive to get by with that.  I know it makes sense and the machine was obviously designed to be operated that way.  Not having a tach really bugs me.

Soooo, with that in mind....

Understanding that Red-line is 5500.
It stops producing HP at 5250 so there is no point in revving beyond that.
I want a margin of safety so I would not want to exceed 5000 RPM, the HP produced between 5000 and 5250 is negligible anyway.

If I wanted to not exceed 5000 RPM's then I would shift at the following.

First   Second   Third   Fourth   Fifth
26mph           45mph          62mpg          75 mph         81mph

That is where my hash marks go.

Any other Enfields in New England?

REpozer

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Re: Question on Maximum RPM's
« Reply #16 on: July 29, 2010, 03:38:27 AM »
Golden,
Alright. I don't need no stinking tach. ;)

   Those shift points would be more for living on the edge, or pushing the the envelope.
Nice to know, but that's not where you want to live.

 Unless you just stole it and running from the police.
2008 AVL Classic Bullet in British Racing Green
REA # 84 ( the first time)

qgolden

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Re: Question on Maximum RPM's
« Reply #17 on: July 29, 2010, 01:30:47 PM »
Yah I agree, but that is where the math comes out.  Providin' I did my cypherin' right.

Anyone please feel free to review and correct me if I am wrong.

Actually if someone could confirm my numbers are right would be cool....

Any other Enfields in New England?

Maturin

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Re: Question on Maximum RPM's
« Reply #18 on: July 29, 2010, 07:49:45 PM »
I clearly overestimated geardata, its a little gear calculator (sic!) but there is not even an english version. I´m sure thre are similar english programs somewhere in the net.
If your maximum is 5000 rpm your marks should be at:
1. 26 mph
2. 40
3. 53
4. 66
5. 80
I calculated tese figures with the original specifications stated in the manual. I used the data of the 100/90 rear tire instead of the 3.50 that is mounted on my bike but there is barely a difference.
For me its obvious now that I can be much less carefull than I thought! This little unit can take much more than you think, even if it sounds a bit strained sometimes  ;D
2010 G5
A Garage without a Bullet is a empty, barren hole.

When acellerating the tears of emotion must flow off horizontally to the ears.
Walter Röhrl

qgolden

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Re: Question on Maximum RPM's
« Reply #19 on: July 30, 2010, 02:00:57 AM »
Maturin,
I wonder why yours and my numbers for first gear and 5th gear are the same, but the middle gears are different?

Did you use these ratios or is my data off?

Gear ratio of each gear in the tranny
1st 3.063:1
2nd 2.013:1
3rd 1.522:1
4th 1.212:1
5th 1.00:1
Any other Enfields in New England?

Maturin

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Re: Question on Maximum RPM's
« Reply #20 on: July 30, 2010, 06:48:58 AM »
Hmm.... :P....I checked these figures a couple of times but they should be correct. Your steps between the 4/5 gear aswell as 3/4 gear are looking a bit odd, maybe there is a mistake. If should be wrong I owe you a beer  :D
2010 G5
A Garage without a Bullet is a empty, barren hole.

When acellerating the tears of emotion must flow off horizontally to the ears.
Walter Röhrl

qgolden

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Re: Question on Maximum RPM's
« Reply #21 on: July 30, 2010, 01:26:20 PM »
OK,
Well I would be tempted to just go with your numbers 'cause they are more conservative than mine. But I pressed on.  I sell power transmission for a living, gearboxes, speed reducers etc. So I used the data available to me.  But I been wrong before.  I went online to search for Gear Calculators.  I found several that are not worth a darn, but this one looked pretty good. The creator allows you to enter data for Bikes that he did not list. You can also change the data to do "what ifs".

The entire site seems to be down except for this one page, so I don't know how long it will last.  But I entered the data for the C5 as I know it.  If you click the drop down menu at the top left Royal Enfield is the last bike on the list.

Numbers calculated at this website are spot on closer to yours than mine.

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

So I guess my question has been answered and I know where the tick marks go... :)

Any other Enfields in New England?

t120rbullet

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Re: Question on Maximum RPM's
« Reply #22 on: July 30, 2010, 01:49:54 PM »
Boy oh boy, those Iron bikes sure were simpler.
All you had to do to them is ride em.
If your hands tingled and your fillings fell out you were over revving it.
CJ
1999 Enfield 500 Black Deluxe "Silver"
2012 Concours 14 (no name yet)
2013 Royal Star Venture S  "Jelly Roll"

qgolden

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Re: Question on Maximum RPM's
« Reply #23 on: July 30, 2010, 02:13:26 PM »
Well, that is what you get when you let a few Anal Retentive Over Analyzing Type A Personalities into the room!   :)  Here is the data for peak Torque and Peak HP.

If you choose 5000 RPM's as your personal Redline as I have, then here is your maximum speed in each gear.  I included Torque for those who like to shift at peak torque. Note that the Maximum Power is higher than Redline in the chart because maximum Power is up at 5250 RPM and I am holding at 5000.  Maximunm Torque is calculated at 4000 RPM.

                       Speed (MPH) at:
Gear        Redline          Torque      Power
1st             26.7            21.3         28
2nd            40.6            32.5         42.6
3rd             53.7            42.9         56.4
4th             67.4            53.9         70.8
5th             81.7            65.4         85.8
Any other Enfields in New England?

UncleErnie

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Re: Question on Maximum RPM's
« Reply #24 on: July 30, 2010, 04:14:47 PM »
Sounds like the BMW crowd is moving into the neighborhood.
Run what ya brung

REpozer

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Re: Question on Maximum RPM's
« Reply #25 on: July 30, 2010, 04:21:07 PM »
Sounds like the BMW crowd is moving into the neighborhood.
Hmm, they seem kinda silly.
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r80rt

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Re: Question on Maximum RPM's
« Reply #26 on: July 30, 2010, 04:27:09 PM »
My bike usually tells me when to shift, I just play it by ear and it works great.
On the eighth day God created the C5, and it was better looking than anything on the planet.
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Ducati Scotty

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Re: Question on Maximum RPM's
« Reply #27 on: July 30, 2010, 04:44:27 PM »
Hmm, they seem kinda silly.

Yeah, don't overthink it.

WillW

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Re: Question on Maximum RPM's
« Reply #28 on: July 30, 2010, 04:53:52 PM »
".....My bike usually tells me when to shift, I just play it by ear and it works great....."

Quite!  It aint rocket science is it..... ::)
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Maturin

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Re: Question on Maximum RPM's
« Reply #29 on: July 30, 2010, 07:39:18 PM »
Did I mention that there is a program that calculates the chain length in case of sprocket change? ;D ;D ;D ;D ;D
2010 G5
A Garage without a Bullet is a empty, barren hole.

When acellerating the tears of emotion must flow off horizontally to the ears.
Walter Röhrl