It is not counter intuitive. If the master cylinder bore is the same as
the slave cylinder bore, you get a 1 to 1 advantage. I believe a 5/8
bore produces a 2 to 1 advantage due to a larger surface area at the slave.
Larry
richard mayor wrote:
> Listmates, Just remember, a small master cylinder bore will result in less
> pedal pressure. And yes, it sounds counter intuitive but it is correct. Get
> over it. The ONLY reason to use a larger bore master cylinder is if you need
> to move a greater volume of fluid. For example, if your master cylinder piston
> bottoms out. My suggestion is to all who read this -- start with a 5/8" master
> cylinder and only go up in size if you need to move more fuid to makes things
> work properly. Remember, bigger bore size means more pedal pressure! Richard
> Mayor
>
>
>> From: jkrowe46@bigpond.net.au
>> To: pieters@pt.lu
>> Date: Fri, 18 Dec 2009 06:33:56 +1000
>> CC: healeys@autox.team.net
>> Subject: Re: [Healeys] Dual Brake System
>>
>> Hi Pieter
>> I also had a 1"master cylinder on the BN1 with BJ8 front discs (though not
>> tandem system) and had a hard pedal even with a PBR VH44 booster. Not a
>>
> good
>
>> feeling. Went to 7/8" and now works well
>>
>> John Rowe Qld Australia
>> BN1 BT7
>>
>> -----Original Message-----
>> From: healeys-bounces@autox.team.net
>>
> [mailto:healeys-bounces@autox.team.net]
>
>> On Behalf Of Pieter and Linda
>> Sent: Friday, 18 December 2009 1:47 AM
>> To: Alan Seigrist
>> Cc: Healey Mailing List
>> Subject: Re: [Healeys] Dual Brake System
>>
>> I have the wilwood 1" bore tandem master cylinder in my BJ7 combined
>> with four pot front calipers and rear discs. It is a straight bolt in
>> fit and easy to plumb but the pedal pressure is high. I would recomend
>> a 7/8 bore. I am fitting a tandem brake booster over the winter so we
>> will see what the pedal pressure is like then,
>> cheers
>> Pieter
>> did see a Healey at Encounter in 2008 that had converted to a Dual
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