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Old 10-16-2010, 01:51 AM
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1 1/4" MC piston...!

Summit sent me the a wrong Corvette MC and since I live in Norway, a return of such a heavy item was out of question. They offered me a 50% refund and keeping the part, which I accepted.
I have measured the MC piston diameter and it measures 1 1/4"!

I'm building my own pedal/booster set up with a 7" single booster and 7:1 pedal ratio. The car has GM discs in front and Jaguar discs at the rear.
What I should have was probably a 1 or 1 1/8" MC...

Do you think the 1 1/4" will work, or is it to big and will result in a very hard pedal?

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Old 10-16-2010, 07:20 AM
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Considering you have a 7:1 pedal ratio, it'll probably make up for that and work fine.
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Old 10-16-2010, 02:00 PM
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I would have to agree with Matt. Power brake systems usually use a ratio of around 4:1, Manual systems use a ratio of around 7:1, so the pedal ratio should cancel out the larger bore. Looks like you're stuck with the 1 1/4" bore anyway, so make the best of it. I'd sure be interested in hearing back concerning how this turns out.
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Old 10-16-2010, 02:44 PM
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I'll third the 7:1 ratio..

I have a 1" bore master and with 10" of vacuum to the booster, I would have a hard pedal the last 10' of the stop. I changed the pedal ratio to the manual setting, 6:1 and it works fine..

Your set up will have much less pedal travel..
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Old 10-17-2010, 02:27 AM
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Since I'm building a 90 degree transeverse set up, I can change the ratio very easy later If that's neccessary.

I' ll keep you informed, and thank you for the reply's
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