Master Cylinder question

[pbureau@attbi.com (ATS - Patrick Bureau)]

AL,

16v Rocco MC 22,2mm Stroke, 17/15 Bore 
G60 noABS MC 22,2mm Stroke, 16/18 Bore

16v MC Bore = 17/15 = 1.13
G60 MC Bore = 16/18 = 0.89

See.. same stoke, smaller bore = more pressure to brake pad than 16v MC.

Patrick


=>-----Original Message-----
=>From: Allyn [mailto:amalventano1@comcast.net]
=>Sent: Thursday, March 14, 2002 11:41 AM
=>To: ATS - Patrick Bureau; scirocco-l@scirocco.org
=>Subject: Re: Master Cylinder question
=>
=>
=>I thought the g60 and 16v mc's had the same bore, but the g60 has 
=>a longer stroke.
=>Al
=>
=>----- Original Message ----- 
=>From: "ATS - Patrick Bureau" <pbureau@attbi.com>
=>To: <scirocco-l@scirocco.org>
=>Sent: Thursday, March 14, 2002 7:47 AM
=>Subject: RE: Master Cylinder question
=>
=>
=>> Agreeing with you on the subject of upgrading the master 
=>cylinder should be
=>> done by compairing pressure and what is needed to make everything work
=>> "better".
=>> 
=>> Though I was required to upgrade from 20.4mm to 22.2mm Master 
=>cylinder (to
=>> be able to support rear disc brakes and front disc 10.1 upgrades).
=>> 
=>> I did perform the logic between the 16v master cylinder and the 
=>G60 Master
=>> cylinder, and in a previous post I did display the difference 
=>between the
=>> two, basically the G60 MC has the identical lenght in stroke, 
=>but the bore
=>> of the G60 Master cylinder is smaller, and if I understand the law of
=>> hydrolic fluids (fro the years back at working at a hydroloic 
=>shop called
=>> Wainbee (manufacturers of hydrolic pistons and lifts ). if you 
=>have pistons
=>> (because that is what a master cylinder is after all, 2 pistons 
=>shifting oil
=>> around.) that have the same stroke, but one has a larger area 
=>(bore) and the
=>> other one is smaller;
=>> 
=>> The larger bore, will require less pedal travel to push the oil to its
=>> destination, but will have less pressure on the piston.
=>> The smaller bore will require more pedal travel to push the oil to its
=>> destination, but will have more pressure on the piston.
=>> 
=>> and since the stroke is the same and the bore is smaller, and 
=>the price is
=>> cheaper, why not get the G60 over the 16v MC?
=>> 
=>> Patrick
=>> 
=>> 
=>> Now when it comes to 11" the G60 is an 11" brake MC. If you are 
=>to find a
=>> 25mm MC try to fiond one with a bore of almost the same size, 
=>that way you
=>> will have more power and less pedal travel all in one. But so far, the
=>> prices really don't warrant this unless you are going to 13" wheels.
=>> 
=>> 
=>> 
=>> =>-----Original Message-----
=>> =>From: scirocco-l-admin@scirocco.org
=>> =>[mailto:scirocco-l-admin@scirocco.org]On Behalf Of Brett Van 
=>Sprewenburg
=>> =>Sent: Wednesday, March 13, 2002 10:20 PM
=>> =>To: scirocco-l@scirocco.org
=>> =>Subject: RE: Master Cylinder question
=>> =>
=>> =>
=>> =>A better braking system starts with the tightest possible tolerances
=>> =>and the least flexible
=>> =>parts...other improvements can be made as I detailed previously.
=>> =>Seeing as how few
=>> =>people actually do that, a larger MC might be able to help...but we
=>> =>should all stop
=>> =>believing it's due to the higher pressures of a larger MC.  We might
=>> =>want to try and
=>> =>firm up the rest of our braking system as much as possible by
=>> =>replacing worn brake
=>> =>calipers (or leaking seals) and rubber lines before diving into
=>> =>another MC.
=>> =>
=>> =>==Brett
=>> 
=>> 
=>> _______________________________________________
=>> Scirocco-l mailing list
=>> Scirocco-l@scirocco.org
=>> http://neubayern.net/mailman/listinfo/scirocco-l
=>