BritBike Forum logo
BritBike Sponsor BritBike Sponsor BritBike Sponsor
BritBike Sponsor

BritBike Sponsor

BritBike Sponsor
BritBike Sponsor BritBike Sponsor BritBike Sponsor
JWood Auction JRC Engineering dealers JWood Auction
Home | Sponsors, Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons, "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Photo posting tutorial

Member Spotlight
coopers
coopers
australia
Posts: 57
Joined: January 2005
Show All Member Profiles 
Shout Box
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Who's Online Now
195 registered members (1xfatboy), 1,788 guests, and 604 spiders.
Key: Admin, Global Mod, Mod
Newest Members
Simon.Holyfield, Bushcreature, Doug Valley, tim_v7, BosBSA
10032 Registered Users
Top Posters(30 Days)
Lannis 144
kommando 103
Stuart 66
Popular Topics(Views)
476,598 mail-order LSR
Forum Statistics
Forums33
Topics65,721
Posts635,201
Members10,032
Most Online3,995
Feb 13th, 2017
Like BritBike.com on Facebook

Previous Thread
Next Thread
Print Thread
Rate Thread
Page 2 of 2 1 2
Re: A65 dynamic crankshaft balancing [Re: Pete R - R.I.P.] #526402
02/04/14 11:39 am
02/04/14 11:39 am
Joined: Sep 2002
Posts: 7,812
Seattle
Alex Offline

BritBike Forum member
Alex  Offline

BritBike Forum member
Joined: Sep 2002
Posts: 7,812
Seattle
Originally Posted By: Pete R

It will actually make less power,even at high rpm.


????

Really???


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Support Your #1 BritBike Forum!
Membership Type! Free
Member
Premium
Member
Premium Life
Member
Vendor
Member
Site
Sponsor
Recognition No Premium Member Premium Life member (5 years) Vendor Member Site Sponsor Membership
Post commercial threads No No No Yes Yes
Custom title No Yes Yes Yes Yes
Upload avatar & photos No Yes Yes Yes Yes
Link avatar & photos Yes Yes Yes Yes Yes
Private Message Storage: 10 100 100 100 100
Length of signatures 255 600 600 600 600
Removes this very advert island between post 1&2 No Yes Yes Yes Yes
Price Free $12.90/year $105.00 No End
$55.00/5 years
$210.00/year
($17.50/month)
Email
Click on button >>
  Premium Member Premium Life member Vendor Member Site Sponsor Membership
Re: A65 dynamic crankshaft balancing [Re: Alex] #526408
02/04/14 12:07 pm
02/04/14 12:07 pm
Joined: Jul 2009
Posts: 3,549
Vic. Australia
P
Pete R - R.I.P. Offline
In Remembrance
Pete R - R.I.P.  Offline
In Remembrance
P
Joined: Jul 2009
Posts: 3,549
Vic. Australia
You might wonder why people like Johnny Allen used heavier than standard flywheels in LSR attempts.His was about 10 lbs heavier than standard.
About 1/4 way down the page here,you'll find why Flywheel and Valvetrain

Re: A65 dynamic crankshaft balancing [Re: Bola] #526430
02/04/14 2:45 pm
02/04/14 2:45 pm
Joined: Sep 2002
Posts: 7,812
Seattle
Alex Offline

BritBike Forum member
Alex  Offline

BritBike Forum member
Joined: Sep 2002
Posts: 7,812
Seattle
Perhaps on an LSR bike the supposed power gain outweighs a 2-3% increase in rolling resistance. On my roadracer acceleration matters and I am pretty happy to lose both the dead weight and rotational inertia. Has anyone measured the supposed power loss or is it conjecture?


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Re: A65 dynamic crankshaft balancing [Re: Pete R - R.I.P.] #526436
02/04/14 4:02 pm
02/04/14 4:02 pm
Joined: May 2013
Posts: 4,670
Rotherham - S. Yorkshire
Allan Gill Online happy
BritBike Forum member
Allan Gill  Online Happy
BritBike Forum member
Joined: May 2013
Posts: 4,670
Rotherham - S. Yorkshire
Originally Posted By: Pete R
Originally Posted By: NickL
Don't be tempted to lighten the flywheel too much, it spoils the engine at all but high revs. (my opinion anyway)

It will actually make less power,even at high rpm.


Isn't this torque related, not inertia? If it is possibly to not loose anything at top end and loose flywheel weight, that would be a much better? Wouldn't acceleration (from a light flywheel)overcome friction (tyre to tarmac)?


beerchug
Re: A65 dynamic crankshaft balancing [Re: Bola] #526474
02/04/14 8:14 pm
02/04/14 8:14 pm
Joined: Sep 2002
Posts: 7,812
Seattle
Alex Offline

BritBike Forum member
Alex  Offline

BritBike Forum member
Joined: Sep 2002
Posts: 7,812
Seattle
I don't remember the exact figure but I think my flywheel is about 6 lbs lighter than stock. It actually idles nicely even with clapped out carb slides. And it spins up like a modern bike when you blip the throttle. Hard to keep the front wheel on the ground too despite the boat anchor TLS brake.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Re: A65 dynamic crankshaft balancing [Re: Bola] #526477
02/04/14 8:23 pm
02/04/14 8:23 pm
Joined: May 2013
Posts: 4,670
Rotherham - S. Yorkshire
Allan Gill Online happy
BritBike Forum member
Allan Gill  Online Happy
BritBike Forum member
Joined: May 2013
Posts: 4,670
Rotherham - S. Yorkshire
Are the effects just because of the weight reduction in the flywheel?


beerchug
Page 2 of 2 1 2

Moderated by  Allan Gill, Jon W. Whitley 


Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.6.1.1