Quote:
Originally Posted by V8 Bob
Gonna have to disagree with some of the above math.
1" master cylinder piston travels 1.27" for 1 c.i. of fluid movement.
1 1/16" master cylinder piston travels 1.12" for 1 c.i. fluid movement.
The 1" piston travel increase is .150", or just over 1/8", not 3/8". This results in pedal travel increase of .750" with a 5:1 ratio, or .9" with a 6:1. As I stated previously, using a 1" is doable in most cases with minimum effort. The resulting higher pressure output with a 1" works better with common disc/drum systems by slightly lowering the pedal effort.
I know converting to a dual master cylinder is the best hydraulic brake upgrade you can make, but does require some thought and extra effort.
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V8 Bob ..... First thing I'm gonna do here is apologize profusely to Bob for ASSUMING that "Pickup's" math was correct. I started to check it last night, but got lazy ..... SHAME!!
Anyway, V8 Bob's math is irrefutable after checking and tells the story in real life terms. I believe the big point here is bringing to light just how important it is to know what you're doing when fooling around with changing M/C bore diameters (or wheel cylinder bore diameters). It's also necessary for folks to realize that
DUAL M/Cs require a GREATER stroke distance than normal to operate sufficiently once one of the circuits becomes compromised. And there are so many other details that need to be figured into these upgrades, like pedal ratios, or even the thickness of carpeting or padding below your brake pedal. And most importantly, take the time to create a TEST LEAK in each circuit of your newly-plumbed dual M/C to make sure that your new configuration will actually stop if a leak occurs in one side of your system.
Coop
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