What speed is should I be able to get at 7000rpm? - Triumph Forum: Triumph Rat Motorcycle Forums
» Main Menu

Discussion Forums
 » Twins
 » Tiger
 » General
 » RAT

Features
 » Blogs

Motorcycle.com Links

Contribute
 » Photo

Motorcycle Forums
» Insurance
» Sponsors
» Our Partners
»ATV Reviews
»Motorcycle Games

Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

Reply
 
LinkBack Thread Tools Display Modes
Old 01-03-2013, 02:33 PM   #1 (permalink)
Member
Supersport 400
Main Motorcycle: T100S
 
Join Date: Mar 2012
Location: UK
Posts: 93
What speed is should I be able to get at 7000rpm?

Hi,
I've got a Boyer electronic igniton unit fitted to my almost finished 1970 T100S. Unfortunately I bought the wrong one - I got one for an Enfield Bullet by mistake. Boyer supplied me with the connection details to use it on my Triumph and the bike starts and runs but I've been informed that the ignition unit has a rev limiter set at 7000rpm (to protect the Enfield engine). The things is, I'm not sure what sort of speed 7000rpm will give me so I'm not sure whether it's going to be a 'problem' or not. So, before I shell out another wad of cash for the correct Boyer unit I thought I'd just ask to see if anyone can give me the speed info.
Thanks.
Tony
tjwood is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 01-03-2013, 04:28 PM   #2 (permalink)
Senior Member
Formula Extreme
Main Motorcycle: VFR
 
Join Date: Apr 2009
Location: Ancaster, UK
Posts: 880
Other Motorcycle: T100S
It will be faster than 70 MPH <s>.
__________________
DerryUK

'69 T100S being rebuilt - very s-l-o-w-l-y - some say stopped!
DerryUK is offline   Reply With Quote Quick reply to this message
Old 01-03-2013, 04:49 PM   #3 (permalink)
Senior Member
Moto Grand Prix
Main Motorcycle: Triumph TR7
 
Join Date: Feb 2012
Location: Norwich, England
Posts: 2,723
Other Motorcycle: T140
Extra Motorcycle: Most of another T140
7630rpm should = 100mph with 18/46 gearbox/rear wheel sprockets. If your sprockets are different to this, obviously the speed/rpm figures will be different.

I think the main question should be whether you're ever likely to want to rev beyond 7000? A lot of people seem to keep a long way below that kind of figure on 500s, 650s & 750s. Not saying this is 'right', just that its apparently quite popular.
JohnA is offline   Reply With Quote Quick reply to this message
Old 01-03-2013, 05:13 PM   #4 (permalink)
Senior Member
SuperStock
Main Motorcycle: gs750 yoshi 850 work hack
 
Join Date: Jan 2011
Location: Pt. Chevalier,Auckland NZ
Posts: 252
Other Motorcycle: 73 T100R
Extra Motorcycle: 2x bsa b31,79 z1000 mk11
Change the black box for the right one, be a cheaper than a whole setup . You dont want to go strangling a 500 ,they are cammed to rev though not recommended to use 7000+ all the time can be useful (and fun)on hard charging runs
daturat100r is offline   Reply With Quote Quick reply to this message
Old 01-03-2013, 05:55 PM   #5 (permalink)
Moderator
Team Owner
Main Motorcycle: Rickman T120
 
Join Date: May 2010
Location: Victoria Australia
Posts: 4,412
Other Motorcycle: T160,TR6
As I recall,max power happens at about 7250 rpm.On a good day,a standard T100R would reach 110 mph (approx. 8400 rpm).
7000 rpm would be about 91.7 mph.

On a 650 or 750 twin,7000 rpm would be a sensible redline.You're living on borrowed time above that,and parts are beginning to break.Once the fatigue cracks have started,it can still take a long time before a crank finally breaks.If cracks are detectable after 1 hour,you might still get 10 hours use at the same loading.

The T100R would still be happy at 8000 rpm.
Mr.Pete is online now   Reply With Quote Quick reply to this message
Old 01-03-2013, 06:07 PM   #6 (permalink)
Lifetime Premium
Site Supporter
Formula Extreme
Main Motorcycle: T100R Daytona special
 
Join Date: Mar 2010
Location: The Land of Oz
Posts: 828
Other Motorcycle: Ducati 748/853
Extra Motorcycle: Cagiva Mito
This a T100S not a T100R so theoretically 7000rpm will give you 92 mph which is probably what you can realistically expect to pull in top gear.
A T100S is rated at 34hp @7000rpm so why would you want to go beyond that as the power is dropping off after that point.
The T100R on the other hand is rated at 41hp @ 7200rpm.
Personally I'd be very happy with a 7000 rev limit on my Daytona and only wish I could program it into the Tri-spark.

.

Last edited by Old Cafe Racer; 01-03-2013 at 06:12 PM.
Old Cafe Racer is online now   Reply With Quote Quick reply to this message
Old 01-04-2013, 08:40 AM   #7 (permalink)
Member
Supersport 400
Main Motorcycle: T100S
 
Join Date: Mar 2012
Location: UK
Posts: 93
Thanks to everyone who replied. What a great set of information! I think I'll run with it on the 'Enfield' Boyer to start with and see how it goes - if I find myself hitting the rev limiter (which sounds very unlikely from the figures people have mentioned - I won't want to go more than 90mph) I'll invest in a new Boyer Triumph black box. Once I've got my carb issues resolved, I'll post back here with the speeds I achieve.
Once again, thanks guys.
tjwood is offline   Reply With Quote Quick reply to this message
Old 01-04-2013, 09:21 AM   #8 (permalink)
Lifetime Premium
Site Supporter
Formula Extreme
Main Motorcycle: T100R Daytona special
 
Join Date: Mar 2010
Location: The Land of Oz
Posts: 828
Other Motorcycle: Ducati 748/853
Extra Motorcycle: Cagiva Mito
If you do hit the rev limiter in 4th gear there is always the option to change to Daytona gearing (19 tooth gearbox sprocket instead of the 18 tooth one)

.
Old Cafe Racer is online now   Reply With Quote Quick reply to this message
Old 01-04-2013, 11:10 AM   #9 (permalink)
Member
Grand Prix 250
Main Motorcycle: 2010 Triumph Thunderbird
 
Join Date: Aug 2012
Location: Rehoboth
Posts: 63
Web Site

http://gearingcommander.com/
Try this website out. I use this on every sprocket change I have done and it is right on. You need to put all info on your bike in first. Don't use the database it is not correct for tire sizes and gear tooth numbers
__________________
2010 Triumph Thunderbird SE, Driving Lights, Crash Bars, Highway Pegs, GPS, Heat Controller, Mustang Seat, Hogslayers, K&N Air Filter, Throttle Lock, Cramp Buster, IPhone Clamp, and more
JJC1957 is offline   Reply With Quote Quick reply to this message
Old 01-06-2013, 10:20 AM   #10 (permalink)
Senior Member
Team Owner
Main Motorcycle: The one between my legs
 
Snakeoil's Avatar
 
Join Date: Feb 2009
Location: Upstate NY
Posts: 5,987
Other Motorcycle: A few
Extra Motorcycle: Yes
I don't think your concern should be hitting the rev limiter in top gear. It would be hitting it as you go thru the gears. That's where you have the greatest possibility of hitting the rev limit. If you plan to wind out the engine running up thru the gears all the time, then having a limit at 7K is probably not a bad idea.

I'm curious. If you ordered the wrong ignition, why couldn't you have simply returned it for an exchange before you installed it? Was it an ebay or swap meet item? I would think any reputable dealer would let you return an iggy if the packaging is not disturbed. I know most electronics are not returnable. I would have also thought that if the dealer was not willing that Boyer would have been willing to swap it out for you.

regards,
Rob
Snakeoil is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Triumph Forum: Triumph Rat Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter your valid email address, that can receive an automated confirmation message. Otherwise, you won't be able to gain full access.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Speed Four to Speed triple, good choice? Reppyboyo Speed Triple Forum 15 04-17-2009 05:57 PM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 02:40 AM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Motorcycle News, Videos and Reviews
Honda Grom Forum Harley Davidson Forum Honda 600RR Kawasaki Forum Yamaha R6 Forum Yamaha FZ-09 Forum
1199 Panigale Forum Roadglide Forum Honda CBR1000 Forum Vulcan Forum Yamaha R1 Forum Yamaha R3 Forum
Ducati Monster Forum Harley Forums Honda CBR250R Forum ZX10R Forum Star Raider Forum Yamaha Viking Forum
Suzuki GSXR Forum V-Rod Forums Honda Shadow Forum Kawasaki Motorcycle Forum Star Warrior Forum KTM Duke 390 Forum
SV650 Forum BMW S1000RR Forum Honda Fury Forum Kawasaki Versys Forum Drag Racing Forum Ducati 899 Panigale Forum
Suzuki V-Strom BMW K1600 Triumph Forum Victory Forums Sportbikes BMW NineT Forum
Volusia Forum BMW F800 Forum Triumph 675 Forum MV Agusta Forum HD Street Forum Suzuki GW250 Forum
Yamaha Motorcycles Victory Gunner Forum Honda Vultus Forum HD LiveWire Forum Ninja H2 Forum Ducati Scrambler Forum

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.