Hi Dave.
 As I said in all my posts, and you have suggested, adjustment from standard
height, or volume of oil must be made when any component occupying a lesser or
greater volume of space in the fork, is placed in there.
 Many people will play with heights and volumes in a standard fork, knowing
that it will change the volume of the air cavity above the oil.  The reduction
of the volume of this cavity by increasing oil capacity or height can build in a
significant änti-dive"effect under brakes by causing the internal pressure in
the fork to increase more quickly per unit of axle travel as opposed to the
greater volume above the standard height or quantity of oil. Think compression
ratios in a cylinder and you`ll get the picture. It will not greatly change the
short stroke action of the fork. That is where oil weight changes and damping
adjustments come in. 
 Doing the fork oil by height is the most accurate way of matching fork oil
fills, but again, the standard height goes out the window when springs and
spacers other than standard are used, because the oil height is done with these
removed.
 Regards, Eddie.
   

--- On Mon, 12/1/09, Dave <arsey30@...> wrote:


From: Dave <arsey30@...>
Subject: [Honda RC30 Owner's Club ] Re: Forks - Compression Adjuster - Preload
Adjusters - Donor Springs Spacer
To: hondarc30ownersclub2@yahoogroups.com
Received: Monday, 12 January, 2009, 9:57 PM







I have had fork seals leak on my RC and other bikes due to wear over
a mileage, [20,000], but grit or scratches on the chrome may have
been the cause.
I always use the standard oil level, my suggestion of reducing
capacity was to make up for the new spacer volume.

My point about road riding or racing was that whilst you can set a
bike up for a 3 mile smooth circuit to get the best compromise, and
notice a small change, a lot of the roads I ride in Surrey and
Hampshire have a poor and variable surface, with holes, bumps, ruts
and ridges, so it would be difficult to detect a small difference a
few ccs of oil made, a bit like 1 click on the damper adjuster.

When I said a few ccs, I was thinking that reducing the oil capacity
would mean measuring the oil by volume, which is less accurate than
oil level / air gap.

--- In hondarc30ownersclub 2@yahoogroups. com, canuckrc30
<no_reply@.. .> wrote:
>
> Funny you should ask. It can be hard on fork seals by causing higher
> pressures (sorta like a spring, but with less linearity) inside the
> fork. Maybe that's your leaky fork seal problem?
>
> If you fill your forks to 1/2 of the spec'd air gap in the manual I
> guarantee you will feel it on the bumpy stuff. It'll be a nasty
bitch
> wanting to shake you off like an 18 year old virgin. Trust me I
know,
> it's happened to me a few times. Now I'm married so I don't have
that
> problem anymore. My grip is better from riding motorcycles which has
> helped me a lot.
>
> I no longer race, and even then it was not on pavement. Not sure
what
> that has to do with setting fork oil levels though. I was number 346
> and number 3 when I raced if memory serves correct.
>
>
> --- In hondarc30ownersclub 2@yahoogroups. com, "Dave" <arsey30@>
wrote:
> >
> > Then why not reduce the oil capacity by 31cc.
> > Do you race, or just ride on the road, as you may not even notice
a
> > small change in capacity, as I don't when a seal leaks.
> >
> >
> > Dave.
> >
> >
> >
> >
> >
> >
> > The man's point about the wall thickness is a good one. There is
31cc
> > of difference between the stock spacer and a same lengths NPS 1
> > Schedule 40 PVC pipe. That is a significant amount of air gone
missing.
> >
>
















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