Re: BTV blues...

Posted by PackardV8 On 2010/6/17 8:59:08

The BTV piston (ram or rod or whatever anyone wants to call it) measures 0.655 inches in diameter. Call it 5/8" diameter close enuf. This IS why the BTV can use the 1:1 pedal ratio. The catch is that it has to travel alot further than the more conventional and widely used 1.000" piston of nearly all other MC's to displace the same amount of fluid/pressure.

THE CONFUSION comes in with the service manual spec. The service manual indicates a 1" MC for the BTV. It is strictly an error. There is nothing even close to 1" about the BTV at all. It is a 5/8 cylinder. Therefore the 1:1 pedal ratio of the BTV and the rather excessive over all length of the entire BTV unit as compared to nearly all other units..