[DeTomaso] Booster talk

[Tomas Gunnarsson]

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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