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Fork Oil Capacity #731557
04/10/18 5:24 pm
04/10/18 5:24 pm
Joined: Jul 2013
Posts: 4
Massachusetts, USA
R
RogerG Offline OP
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RogerG  Offline OP
BritBike Forum member
R

Joined: Jul 2013
Posts: 4
Massachusetts, USA
Just about all references I have seen (including the two manuals I have) say 5 fl. oz. (150cc) oil per leg. But the illustrations all show forks with internal springs and damper rods. My '55 ES2 has external springs, damper tubes but no rods. Is it still 150cc? Another reference (from 2007) in this forum says fill to 1/2" above the damper tube with forks fully extended. I fully extended a fork leg and then lowered a wooden rod into the stanchion until it hit bottom. I then compressed the leg slowly and it traveled about 1/2" before the damper tube started to push on the rod, indicating that the top of the damper tube is about 1/2" below the top surface of the lower bush retaining screw/bolt. So filling until the rod, when fully inserted, is just touching oil would be 1/2" above the tube. Does this make sense?

Thanks!


Roger Allen

1955 Norton ES2
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Re: Fork Oil Capacity [Re: RogerG] #731560
04/10/18 6:00 pm
04/10/18 6:00 pm
Joined: Mar 2006
Posts: 3,895
Norfolk, UK
L.A.B. Online content
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L.A.B.  Online Content
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Joined: Mar 2006
Posts: 3,895
Norfolk, UK
Originally Posted by RogerG
Just about all references I have seen (including the two manuals I have) say 5 fl. oz. (150cc) oil per leg. But the illustrations all show forks with internal springs and damper rods. My '55 ES2 has external springs, damper tubes but no rods. Is it still 150cc?


The quantity for 'Long' Roadholders was "1/4 (Imperial) pint" which is 142cc/ml so near enough 150cc.


5 Imperial fl. oz (20 Imperial fl. oz = 1 Imp. pint) = 142cc
5 US fl. oz. = 147.86cc

Re: Fork Oil Capacity [Re: L.A.B.] #731576
04/10/18 10:40 pm
04/10/18 10:40 pm
Joined: Jul 2013
Posts: 4
Massachusetts, USA
R
RogerG Offline OP
BritBike Forum member
RogerG  Offline OP
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R

Joined: Jul 2013
Posts: 4
Massachusetts, USA
OK, so I learned something today! Thank you L.A.B. I always presumed that a fl.oz. was a fl.oz. and that a real pint of beer was bigger than a US pint of beer simply because it was 20 fl.oz. not 16. So instead of it being a 25% difference, it's about 20%. Useful to remember that with fuel too. 150cc vs 142cc is a small difference.

Boring trivia alert: a 1/2 US pint (8 us fl.oz) is called a cup in the kitchen. Probably not going to find an everyday household tea or coffee cup that is 8 fl.oz. So you have to have measuring utensils in the kitchen (usually multiple sets) that allow you to measure easily in fractions of a cup as well as fl.oz. Note also that teaspoon and tablespoon are precise quantities, being fractions of a us fl.oz. (1/6 and 1/2 respectively). I think we have one that is 1/8 teaspoon. And you need sets for cc/ml too, for those foreign recipes.


Roger Allen

1955 Norton ES2
Re: Fork Oil Capacity [Re: RogerG] #731580
04/11/18 12:43 am
04/11/18 12:43 am
Joined: Feb 2008
Posts: 4,709
New Jersey USA
Tridentman Online content

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Tridentman  Online Content

BritBike Forum member

Joined: Feb 2008
Posts: 4,709
New Jersey USA
Just to make the recipe situation even more difficult:
In the UK there are teaspoons, dessert spoons and tablespoons.
In the US there are teaspoons and tablespoons.
Now--a UK teaspoon = a US teaspoon.
BUT--a UK dessert spoon = a US tablespoon.
There is no US equivalent of a UK tablespoon.
DAMHIK the difference!
HTH


Moderated by  Dave Comeau 

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