[DeTomaso] Booster talk

[asajay at asajay.com]

And if I recall, most all master cylinders are built this way...  
including the one in the car you are currently driving.  Just a thought.

Asa Jay

Quoting Tomas Gunnarsson <guson at home.se>:

> Larry,
>
> Fear not, the secondary piston (plunger) is moved by hydraulic   
> pressure, not the spring. The spring is there to push the primary   
> piston back to its point of origin so the opening to the fluid   
> reservoir is not covered. When the primary piston moves past the   
> reservoir port the secondary piston immediately starts to move from   
> the primary circuit pressure.
>
> Tomas
>
> ----- Original Message -----
> From: "Larry - Ohio Time Corp" <larry at ohiotimecorp.com>
> To: "'Thomas Tornblom'" <Thomas.Tornblom at hax.se>; "'Tomas   
> Gunnarsson'" <guson at home.se>
> Cc: <detomaso at realbig.com>
> Sent: Wednesday, July 22, 2009 2:16 PM
> Subject: RE: [DeTomaso] Booster talk
>
>
> Call me crazy, and many do, but I think the design of the master cylinder
> plunger sucks. I would never want the front 1/2 of the piston being pushed
> by a spring! If the bore got gooped up the piston would not move forward,
> the spring would just collapse. I want to regulate the pressure by the
> amount I push with my leg, not the amount of movement the spring is
> allowing.
>
> I think I am going to shoot mine when I go home tonight.
>
> Larry (still crazy) - Cleveland
>
> -----Original Message-----
> From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
> Behalf Of Thomas Tornblom
> Sent: Tuesday, July 21, 2009 5:33 PM
> To: Tomas Gunnarsson
> Cc: detomaso at realbig.com
> Subject: Re: [DeTomaso] Booster talk
>
> Tomas Gunnarsson skrev:
>> Yes, but it takes more than sleeving down the front part of the bore.
> You'd have to turn down the front part of the slave piston and sleeve down
> half the bore for that piston in order to get a change in pressure. I think
> you'd need a notably longer cylinder and piston combination to retain
> sufficient clearances to make the two circuits work with redundancy to
> failure in one circuit. I can look for it and we can take it apart together.
> Note that my cylinder is very early in case they changed during production.
>
> Thanks.
>
> I found a photo of a disassembled cylinder here:
> http://www.brakecylinder.com/oddsandends.htm
>
> Although it is a Bonaldi, it appears to be very similar, if not identical.
>
> I guess a dual master setup with a balance bar is the simplest to get
> working.
>
> I also noticed that the GT5 use a cylinder with a larger bore (25mm)
> than earlier cylinders (22 or 23 mm).
>
>>
>> Tomas
>
> Cheers,
> Thomas
>
>>
>> ----- Original Message -----
>> From: "Thomas Tornblom" <Thomas.Tornblom at hax.se>
>> To: <detomaso at realbig.com>
>> Sent: Tuesday, July 21, 2009 9:44 PM
>> Subject: Re: [DeTomaso] Booster talk
>>
>>
>>> Anyone got a late master cylinder to spare, working or not working?
>>>
>>> I'd like to see if it would be possible to add a sleeve to the front
>>> bore and thereby increase the pressure to the rear brake circuit.
>>>
>>> Pictures of a disassembled Benditalia master cylinder would also be
>>> interesting.
>>>
>>> Tomas:
>>> Wasn't your stock master cylinder broken? Have you opened it up?
>>>
>>> Cheers,
>>> Thomas
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>
>
> --
> Real life:   Thomas Törnblom             Email:  Thomas.Tornblom at Hax.SE
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>               S - 754 40 Uppsala, Sweden  Cellular: +46 70 261 1372
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