torque needed for wheelie? : V-Twin Forum: Harley Davidson Forums
» Sponsors

» Insurance
Go Back   V-Twin Forum : Harley-Davidson Motorcycle Forums > Technical Discussion Forums > Twin-Cam 88" Engine Technical Discussion
New User? Register Forgot Password

Reply
 
LinkBack Thread Tools Display Modes
Old 10-09-2004, 06:09 PM   #1 (permalink)
IronButt
 
Join Date: Aug 2003
Location: NH
Posts: 280
ratrider wants to know Dino or Syn?
torque needed for wheelie?

What would I have to do to get my '02' FXDX to pull the front wheel just by twisting the throttle? If you know the total weight and distribution, gearing, etc., I would assume you could calculate the torque needed to lift the front. Maybe I'll try easing the front wheel onto the bathroom scale.
__________________
_______________________________________
DOH! NUTTS! Is there nothing they can't do?
ratrider is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 10-09-2004, 09:38 PM   #2 (permalink)
IronButt
 
Rockbiter's Avatar
 
Join Date: Jun 2004
Location: Moody AFB, GA
Posts: 1,096
Rockbiter wants to know Dino or Syn?
I typed up a two page disertaion on this just now, and then the web site dumped it. Suffice to say, you would need about 150 ft lbs of torque to straight lift the front end by throttle alone. I did all the math, applied the torque multiplying effects of the gearing, etc etc. (630 lb bike, no rider) That assumes perfect traction, zero loss transmission, etc. add mass near the rear axle, and the numbers start dropping quick, put the GF over the rear axle, and she'll be punching you in the kidneys in no time...

A stock bike will not do it (mathmaticly speaking), but put out about 100 ft lbs of torque, with a center of balance close to the rear axle, and you are skyborn in no time!
__________________
YMMV, YGWYPF, TANSTAAFL, WITMM?
Your Milage May Vary, You Get What You Pay For, There Aint No Such Thing As A Free Lunch, Who Is That Masked Man?

I'm not yet at the exact level of boredom required to taste the cat.

'04 TC103 FXD
SE 4.375" Stroker Crank
SE 3.875" Flat top Pistons
SE 211 cams
Modified/Revalved Chevy Lifters
SE A/C
SE 2 Slip-Ons
Big City Thunder TMSEII Baffles
SE 6200 RPM Ignition module
SE Clutch spring
White Bros E-Z clutch release
LMR2 oil pressure spring
Rockbiter is offline   Reply With Quote Quick reply to this message
Old 10-09-2004, 09:49 PM   #3 (permalink)
IronButt
 
Seahag's Avatar
 
Join Date: Apr 2004
Location: Minnesota
Posts: 2,067
Seahag wants to know Dino or Syn?
Lets not forget slipping/dropping the clutch...I talked to a guy who would wheelie his electra glide (stage I only)...he told me the trick was to dump the clutch over 4000rpm. This guy was an old motorcrosser and would wheelie everything. I'd never try it on my glide.
__________________
The only thing better than riding, is riding with friends
Seahag is offline   Reply With Quote Quick reply to this message
Old 10-10-2004, 02:36 AM   #4 (permalink)
Known Associate
 
Mad Dog's Avatar
 
Join Date: Sep 2004
Location: Hawaii
Posts: 170
Mad Dog wants to know Dino or Syn?
On a special done by the Discovery Channel on Corbin Seats, they showed an Ultra Classic, yeah, the fully dressed one with all the fairings, tour pack, etc. pull a throttle only wheelie (no rev the motor, pop the clutch) for about 35-40 ft. !

I don't know the specifics of the motor build up, etc. but it was very impressive....
__________________
1990 FATSTER - 16" wheels front/back, Fat-Bob tanks/dash, Koni shocks, Ness taildragger fenders, Ness wide-glide billet trees, Storz steering dampener, PM calipers, full-floater rotors, SBS brake pads, Fat-Boy lights, 1200 10:1 pistons, Total Seal Gapless rings, Andrews V6 cams, Crane adj. pushrods, mod. CV carb., custom Ram-Air filter, Crane Single-Fire, Accel coils, Thunderheader (from Sonny Barger), Barnett Extra-Plate clutch, Balance Master, Jagg oil cooler, Spyke Krank Vent,....
Mad Dog is offline   Reply With Quote Quick reply to this message
Old 10-10-2004, 04:07 AM   #5 (permalink)
IronButt
 
Cryptoboy's Avatar
 
Join Date: Oct 2003
Location: Tempe, AZ
Posts: 1,927
Cryptoboy wants to know Dino or Syn?
Quote:
Originally Posted by ratrider
What would I have to do to get my '02' FXDX to pull the front wheel just by twisting the throttle? If you know the total weight and distribution, gearing, etc., I would assume you could calculate the torque needed to lift the front. Maybe I'll try easing the front wheel onto the bathroom scale.
Easiest and cheapest way....go buy a Suzuki GSX-R 1000! (you might be able to save a few grand and get the 600 instead!)

Actually one of the parts guys at the local dealer has an FXDX and he is able to pop a wheelie just about anytime, although he's pretty secretive and tends to avoid the subject when we ask him what he modified.......
__________________
No, I will not fix your computer.

GO NOLES!!!!!
Cryptoboy is offline   Reply With Quote Quick reply to this message
Old 10-10-2004, 05:10 PM   #6 (permalink)
IronButt
 
Rockbiter's Avatar
 
Join Date: Jun 2004
Location: Moody AFB, GA
Posts: 1,096
Rockbiter wants to know Dino or Syn?
I think the easiest way would be to change the gearing lower (the secret way would be to use a smaller diameter engine sprocket)

Other than that, doing the typical stage one mods, with cams and maybe head porting should be enough to do it without going cost-overboard. Stiffen up the rear suspention to maximize appied torque. Stickier tires. The Dunlops are too hard IMHO.

Wow, the more i think about this, the more i wanna find out...
__________________
YMMV, YGWYPF, TANSTAAFL, WITMM?
Your Milage May Vary, You Get What You Pay For, There Aint No Such Thing As A Free Lunch, Who Is That Masked Man?

I'm not yet at the exact level of boredom required to taste the cat.

'04 TC103 FXD
SE 4.375" Stroker Crank
SE 3.875" Flat top Pistons
SE 211 cams
Modified/Revalved Chevy Lifters
SE A/C
SE 2 Slip-Ons
Big City Thunder TMSEII Baffles
SE 6200 RPM Ignition module
SE Clutch spring
White Bros E-Z clutch release
LMR2 oil pressure spring
Rockbiter 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 V-Twin Forum : Harley-Davidson 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:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself. WE WILL SEND A CONFIRMATION EMAIL TO THE ADDRESS YOU PROVIDE. If the email address is NOT VALID, you will not be given access to the system!
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 post new threads
You may 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


Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 11:57 PM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
(C)2001-2012 V-twinForum.com All Rights Reserved (C)2001- V-twinForum.com All Rights Reserved
Motorcycle News, Videos and Reviews
Honda Grom Forum Harley Davidson Forum Honda 600RR Forum 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 Kawasaki Ninja 250SL Forum