A view of some different heads

[Hydros]

From left to right

Unknown, copper in color.  Notice the dish shaped head.

Prohopper street

Ottos Hydraulics, Chrome Jets (late 70's early 80's)

Black Magic Hydraulics, competition

[87gbody]

Does the dish shaped head significantly increase effective piston area? Not a bad idea...

[Hydros]

Man that's a good one, I need to think this one out, what a great observation. you may be on to something here...

Some brake master cylinders are made to move fast and then take up the load. They have a small pistion area and as the piston travels it opens into a larger diameter.

This is an area that might be very useful, good going 87G

[87gbody]

Man that's a good one, I need to think this one out, what a great observation. you may be on to something here...

Some brake master cylinders are made to move fast and then take up the load. They have a small pistion area and as the piston travels it opens into a larger diameter.

This is an area that might be very useful, good going 87G

So it starts off making pressure, then moves to volume? I guess you could call that a "progressive cylinder" or something. I'm going to google that master cylinder setup, post up a pic or info if you have it handy.

I don't think it would take much to have a dome machined into an existing cylinder.

[87gbody]

Does the dish shaped head significantly increase effective piston area? Not a bad idea...

I asked a few friends about this, they all agreed that the force only acts on what is perpendicular to it, meaning no difference. However I did find an old "google answer" which I found interesting:

"The pressure acts on what you might call the projected
area of the piston. The projected area being the area that would
project onto a plane perpendicular to the axis of the piston." 

I'll be sure to post any more info I find.

[Hydros]

Does the dish shaped head significantly increase effective piston area? Not a bad idea...

I asked a few friends about this, they all agreed that the force only acts on what is perpendicular to it, meaning no difference. However I did find an old "google answer" which I found interesting:

"The pressure acts on what you might call the projected
area of the piston. The projected area being the area that would
project onto a plane perpendicular to the axis of the piston."  

I'll be sure to post any more info I find.

Yes/yeah,   this is interesting.  I can see all sorts of things happening with this if is it proved to be a benefit, from cylinders to piston pumps to hybrid suspensions.