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Author Topic: Question on Maximum RPM's  (Read 2107 times)

qgolden

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Question on Maximum RPM's
« on: July 28, 2010, 02:01:49 AM »
Back in the day,  (love starting a paragraph with that phrase) lots of smaller bikes did not have Tachs on 'em.  some of 'em had hash markes on the speedo which would indicate maximum speed in each gear.  One hash mark around 10 MPH for first, two around 20 or so for second etc.  RE does not do that nor do we have a tach.  I checked the manual but it does not give any refrence to maximum speed in each gear.  Has anyone ever seen any documentation from the factory regarding this?

Second question has anyone ever seen a peak HP/Torque curve chart for these engines?

-Q
Any other Enfields in New England?

Ice

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Re: Question on Maximum RPM's
« Reply #1 on: July 28, 2010, 03:13:58 AM »
 
Fairly certain the information you seek is in the threads
Search them especially Ace Cafe's posts.

For certain there is a dyno chart or two in the threads,here's one

 http://www.enfieldmotorcycles.com/forum/index.php/topic,3242.msg41775.html#msg41775


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singhg5

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Re: Question on Maximum RPM's
« Reply #2 on: July 28, 2010, 04:12:03 AM »
Back in the day,  (love starting a paragraph with that phrase) lots of smaller bikes did not have Tachs on 'em.  some of 'em had hash markes on the speedo which would indicate maximum speed in each gear.  One hash mark around 10 MPH for first, two around 20 or so for second etc.  RE does not do that nor do we have a tach.  I checked the manual but it does not give any refrence to maximum speed in each gear.  Has anyone ever seen any documentation from the factory regarding this?

Second question has anyone ever seen a peak HP/Torque curve chart for these engines?

-Q
Q:

Your second question answer - A torque and HP curve for EFI was published on this Forum several months ago.  You can do some searches to find it.  If I see it again, I will add the link.

Your First question -  Maximum speed in each gear.  Here is what I follow on my G5 now a days.

UPSHIFT  @   15 mph on the speedometer to 2nd Gear  
               @   25 mph on the speedometer to 3rd Gear
               @   35 mph on the speedometer to 4th Gear
                @  45 mph on the speedometer to 5th Gear.

You can stretch a bit more at higher gears.  The ECU is programmed to cut off fuel supply if the bike reaches a MAXIMUM RPM of 5500.  


           -------------------------------------------------------------------
 Need to add a correction factor for my Speedometer because it is off.  

    The true speed is 13 mph - when speedo reads 15 mph
                              22 mph - when speedo reads 25 mph
                              31 mph - when speedo reads 35 mph
                              40 mph - when speedo reads 45 mph
« Last Edit: July 29, 2010, 12:22:25 PM by singhg5 »
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REpozer

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Re: Question on Maximum RPM's
« Reply #3 on: July 28, 2010, 04:14:49 AM »
In your Hand Book, look up " Run-In".  What does it say?
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Ducati Scotty

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Re: Question on Maximum RPM's
« Reply #4 on: July 28, 2010, 02:21:24 PM »
The ECU is programmed to cut off fuel supply if the bike reaches a MAXIMUM RPM of 5500. 

Just curious, anyone hit the rev limiter yet?  What's it like?  On my Kawasaki it was a nice gentle loss of power.  On the Ducati it was abrupt and would throw the bike a little if you were in a corner.  Most disconcerting.

Scott

Maturin

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Re: Question on Maximum RPM's
« Reply #5 on: July 28, 2010, 09:23:27 PM »
According Geardata 2.11 here the MaxRevs in km/h for the G5:

17 sprockets (original)
1. 47
2. 71
3. 89
4. 112
5. 136

18 sprockets (optinal from c5)
1. 49
2. 75
3. 95
4. 119
5. 144

Since mine ran only 1000 km no contact to the limiter (yet  ;D)
The problem I am facing now is: how fast am I? The Speedo allows only rough estimates.


« Last Edit: July 28, 2010, 09:36:39 PM by Maturin »
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ace.cafe

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Re: Question on Maximum RPM's
« Reply #6 on: July 28, 2010, 10:15:01 PM »
I'm pretty sure they consider 5200 rpm to be maximum rpm on the UCE.
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Maturin

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Re: Question on Maximum RPM's
« Reply #7 on: July 28, 2010, 10:51:07 PM »
My manual says the maximum performance is at 5250 rpm, so I think the red zone starts at 5500.
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singhg5

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Re: Question on Maximum RPM's
« Reply #8 on: July 28, 2010, 10:56:59 PM »
I'm pretty sure they consider 5200 rpm to be maximum rpm on the UCE.

My manual says the maximum performance is at 5250 rpm, so I think the red zone starts at 5500.

Ace:

As Maturin has just posted, while I was typing this reply, these RPM values are listed in the RE factory issued manuals.  Here are the pictures -

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singhg5

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Re: Question on Maximum RPM's
« Reply #9 on: July 28, 2010, 11:08:45 PM »
According Geardata 2.11 here the MaxRevs in km/h for the G5:

17 sprockets (original)
1. 47
2. 71
3. 89
4. 112
5. 136

18 sprockets (optinal from c5)
1. 49
2. 75
3. 95
4. 119
5. 144

Since mine ran only 1000 km no contact to the limiter (yet  ;D)
The problem I am facing now is: how fast am I? The Speedo allows only rough estimates.

Maturin:

You have posted interesting numbers.  I am just converting your figures to mph for US speedometers, which are in mph.  

What is Geardata 2.11 ?

FOR G5

1 Gear -  47 kph   = 29 mph
2 Gear -  71 kph   = 44 mph
3 Gear -  89 kph   = 56 mph
4 Gear - 112 kph  = 70 mph
5 Gear - 136 kph  = 83 mph

Did you calculate these figures from the gear ratio, which are listed as 3.063, 2.013, 1.522, 1.212 and 1 ?  Using these gear ratios, I came up with values close to what you have.  These are as follows -

1 Gear = 27 mph
2 Gear = 41 mph
3 Gear = 54 mph
4 Gear = 68 mph
5 Gear = 83 mph
« Last Edit: July 28, 2010, 11:19:42 PM by singhg5 »
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qgolden

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Re: Question on Maximum RPM's
« Reply #10 on: July 28, 2010, 11:17:06 PM »
Singhg5
I was just about to post the same question,  THX  I apreciate the upshift data, but I am looking for the maximum RPM in each gear.  I do not really have an ear for this single and with no tach I don't know where I am in the power curve.

ICE
I did find dyna charts,  THX,
http://www.enfieldmotorcycles.com/forum/index.php?action=dlattach;topic=6995.0;attach=6418;image
REPozer,
As was posted the manual does not answer my question, it just gives the maximum but know way to tell when you hit it!

THX all for the replies. 

Are the Gear Ratio's the same for the G5 and C5?  I can do some math and get my answers if they are.



Any other Enfields in New England?

qgolden

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Re: Question on Maximum RPM's
« Reply #11 on: July 28, 2010, 11:20:11 PM »
OH and here is the conversion KPH to MPH for the C5 (using data from Maturin)

Gear     KPH   MPH
1st        49  =  30
2nd       75  =  46
3rd        95  =  59
4th        119 = 74
5th        144 = 89
Any other Enfields in New England?

singhg5

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Re: Question on Maximum RPM's
« Reply #12 on: July 28, 2010, 11:27:34 PM »
Singhg5
I was just about to post the same question,  THX  I apreciate the upshift data, but I am looking for the maximum RPM in each gear.  I do not really have an ear for this single and with no tach I don't know where I am in the power curve.

ICE
I did find dyna charts,  THX,
http://www.enfieldmotorcycles.com/forum/index.php?action=dlattach;topic=6995.0;attach=6418;image
REPozer,
As was posted the manual does not answer my question, it just gives the maximum but know way to tell when you hit it!

THX all for the replies. 

Are the Gear Ratio's the same for the G5 and C5?  I can do some math and get my answers if they are.

Quinn:

We are playing 'musical chair' !  We are both calculating and posting at the same time  ;D

First, I am glad you found the correct graph of power vs. rpm for EFI.

Second, the OVERALL gear ratio is the same for G5 and C5.  The secondary ratio is 2.235:1 for G5 and 2.11:1 for C5. 

I have modified my previous post with some more calculations which were not there when it was first posted !!
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REpozer

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Re: Question on Maximum RPM's
« Reply #13 on: July 28, 2010, 11:44:41 PM »

REPozer,
As was posted the manual does not answer my question, it just gives the maximum but know way to tell when you hit it!
Seems easy enough then. Running the throttle at" Rabbit" would be bad. Closer to "turtle" would be better. Without exceeding the "Hand Book" speed, or "loading" ,"lugging' or "pinging" the engine.
Those speeds probably assume a level road with no head wind or elevation.
Still have to pay attention to conditions.
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qgolden

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Re: Question on Maximum RPM's
« Reply #14 on: July 29, 2010, 02:29:47 AM »
singhg5
By "secondary" I presume you are referring to the final drive ratio based on the output spocket to the rear wheel sprocket?

The Ratios of  the Tranny Gears are the same for each, correct?

-Quinn
Any other Enfields in New England?