[Spridgets] Master cylinder

Lester oldsaabguy at comcast.net
Wed Aug 3 14:01:20 MDT 2011


You have two things to consider with hydraulics:

1. The volume of fluid that must be moved and

2.  The pressure needed.

So...

larger cylinder means more fluid (per travel inch) but less pressure  (Your
foot pressure over larger surface area = less pressure)

smaller cylinder means less fluid  but more pressure

The fluid moved needs to be the distance the clutch slave cylinder needs to
move by it's bore.  This volume changes depending on which size cylinder you
have.

So, in general, a smaller cylinder will give you more travel and require less
effort and a large cylinder will give you less travel and more effort.

Lester

.. see, I gave you all sorts of info that wasn't helpful!  ;-)




On Aug 3, 2011, at 6:26 AM, Joe Lansing wrote:

> I can't get my Rivergate clutch slave set correctly. It really seems like I
don't have enough throw. So my simple mind is asking - "Which master cylinder
provides more throw? A 3/4" or a 7/8?" Did my '62 have a 3/4" of 7/8"? I think
I now have a master out of a 65...
>
> Any guidance you can offer?
>
> Joe
> Home of the perpetual Sprite project
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