Printable Version | Subscribe | Add to Favourites
New Topic New Poll New Reply
Author: Subject: Heavy clutch
Trigger1

posted on 20/10/18 at 08:01 PM Reply With Quote
Heavy clutch

Is it normal to have a heavy clutch on a bike engined car (919 Fisher Fury).

I've only ever driven one other bike engined car and I can't remember if that was heavier than a normal car clutch or not?

Is it normal to have a slightly heavy clutch on a bike engined car, the Fury has uprated clutch springs if that makes a difference?

View User's Profile View All Posts By User U2U Member
CosKev3

posted on 21/10/18 at 09:31 AM Reply With Quote
No totally the opposite,bike clutches are usually very light in a car using a foot pedal,as the biker would have just used his hand to pull the clutch in!

With standard bike engine springs in my experience the clutch is way too light in a car with a lack of feel when letting it out,even with uprated springs it improves the feel a lot but it's still way lighter than any car engined clutch.

Any pics of your cable and routing of it?

[Edited on 21/10/18 by CosKev3]

View User's Profile View All Posts By User U2U Member
adithorp

posted on 21/10/18 at 04:18 PM Reply With Quote
Ive come across a couple like that. It depends on the leverage at the pedal. Get it wrong (ie, cable attachment too far from the fulcrum or too big a master cylinder diameter) and you get a heavy clutch. The other negative effect of that is a very binary bite point; either on or off and nothing between.





"A witty saying proves nothing" Voltaire

http://jpsc.org.uk/forum/

View User's Profile View All Posts By User U2U Member
Trigger1

posted on 21/10/18 at 10:26 PM Reply With Quote
Thanks both, I'll see if I can get some pics, but sounds like I need someone who knows these better than me to point me in the right direction.
View User's Profile View All Posts By User U2U Member
40inches

posted on 22/10/18 at 08:09 AM Reply With Quote
You need to get the cable clevis as near to the pedal pivot as possible. I managed to get 100mm of pedal movement to 25mm of clutch lever.
View User's Profile View All Posts By User U2U Member
Trigger1

posted on 22/10/18 at 06:01 PM Reply With Quote
quote:
Originally posted by 40inches
You need to get the cable clevis as near to the pedal pivot as possible. I managed to get 100mm of pedal movement to 25mm of clutch lever.


Do you mean this bit?

https://flic.kr/p/2aVXvRe

View User's Profile View All Posts By User U2U Member
adithorp

posted on 22/10/18 at 08:11 PM Reply With Quote
Yes. From memory (it was 11 years ago) on my Fury I cut the 2 forked bits off the bottom of the clutch pedal and ground it back to flat. Then drilled a new hole through closer to the fulcrum (pivot) and attached with a saddle on the end of the cable.





"A witty saying proves nothing" Voltaire

http://jpsc.org.uk/forum/

View User's Profile View All Posts By User U2U Member
Trigger1

posted on 22/10/18 at 09:06 PM Reply With Quote
quote:
Originally posted by adithorp
Yes. From memory (it was 11 years ago) on my Fury I cut the 2 forked bits off the bottom of the clutch pedal and ground it back to flat. Then drilled a new hole through closer to the fulcrum (pivot) and attached with a saddle on the end of the cable.


Thanks, makes sense to increase travel, but how does that have an affect of reducing the stiffness of the clutch?

View User's Profile View All Posts By User U2U Member
adithorp

posted on 23/10/18 at 07:30 AM Reply With Quote
It'll increase the leaverage so the pedal will feel lighter to press and give more control of the bite point.

As well as moving the cables attachment point on the pedal you'll also have to raise the outer cable attachment position in the end of the pedal box to keep it inline.





"A witty saying proves nothing" Voltaire

http://jpsc.org.uk/forum/

View User's Profile View All Posts By User U2U Member
Trigger1

posted on 23/10/18 at 04:33 PM Reply With Quote
quote:
Originally posted by adithorp
It'll increase the leaverage so the pedal will feel lighter to press and give more control of the bite point.

As well as moving the cables attachment point on the pedal you'll also have to raise the outer cable attachment position in the end of the pedal box to keep it inline.


Now you've explained it, it makes perfect sense, thanks!

View User's Profile View All Posts By User U2U Member
AdamR20

posted on 23/10/18 at 07:49 PM Reply With Quote
As above; you want about a 6:1 ratio at the clutch pedal.
View User's Profile View All Posts By User U2U Member

New Topic New Poll New Reply


go to top






Website design and SEO by Studio Montage

All content © 2001-16 LocostBuilders. Reproduction prohibited
Opinions expressed in public posts are those of the author and do not necessarily represent
the views of other users or any member of the LocostBuilders team.
Running XMB 1.8 Partagium [© 2002 XMB Group] on Apache under CentOS Linux
Founded, built and operated by ChrisW.