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Date:         Sat, 4 Feb 2012 16:58:41 -0700
Reply-To:     OlRivrRat <OlRivrRat@COMCAST.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         OlRivrRat <OlRivrRat@COMCAST.NET>
Subject:      Re: Jaguar vs. Passat brakes on Vanagon
Comments: To: Alistair Bell <albell@SHAW.CA>
In-Reply-To:  <6B1A8917-BF81-4DA0-B151-298E134C59F9@shaw.ca>
Content-Type: text/plain; charset=UTF-8; format=flowed; delsp=yes

Alistair

BigOldummyMe ~ I knew that ~ Haven't had enough sleep lately & it's still too early

to have a drink. When I was doin the math, I was tellin myself there was something wrong

but I just didn't listen well enough. Thanks AB

ORR ~ DeanB

On 4 Feb , 2012, at 2:54 PM, Alistair Bell wrote:

> sheesh you guys, come on now > > A = pi X (radius squared) > > (circumference = diameter X pi) > > > 3" piston: > > A = Pi X(1.5 squared) > = 7.07 square inches > > 1.5" piston > > A = Pi X (0.75" squared) > = 1.77 square inches > > So two 1.5" diameter pistons would have a total area of: > > 2 X 1.77 = 3.54 square inches > > > alistair > > > > > On 2012-02-04, at 1:03 PM, OlRivrRat wrote: > >> Dennis >> >> Also ~ the area of a circle is found by ~ Pi x Diameter. The >> vol' of a cylinder is Pi x (Radius x Radius). >> >> So your 3" piston has an "FootPrint" of 9.428 Sq" & your two 1.5s >> will also = 9.428 Sq". >> >> ORR ~ DeanB >> >> On 3 Feb , 2012, at 8:11 PM, Dennis Haynes wrote: >> >>> My concern is both the threads and the face of the hub cracking >>> from the center. Yes most front drive vehicles use a flange hub >>> with the rotors slipped on or over and many use bolts threaded >>> into those hubs but those hubs-flanges are from a solid machined >>> piece of steel, not a casting. The rotor casting is designed to >>> work as is. That hat and disc adds strength to the flange. Did >>> anyone notice my error in the area calculations? I used the >>> diameter, not the radius. >>> >>> Dennis >>> >>> -----Original Message----- >>> From: Chris S. [mailto:szpejankowski@gmail.com] >>> Sent: Friday, February 03, 2012 4:03 PM >>> To: Dennis Haynes >>> Cc: vanagon@GERRY.VANAGON.COM >>> Subject: Re: Jaguar vs. Passat brakes on Vanagon >>> >>> So your concern are the threads going into the machined hub. >>> >>> Newer VW vehicles use front hubs and hub-centric rotors which do >>> not utilize press-in studs. The pressure of lug bolts holds the >>> wheel and rotors in place. Perhaps the hub material in those hubs

>>> are of different hardness to handle the extra load. It would seem

>>> that the forces would be transferred by the hub face and not the >>> lug bolts themselves. The lug bolts merely provide the clamping >>> force. >>> >>> Chris. >>> >>> Wysłane z iPhone'a >>> >>> Dnia Feb 3, 2012 o godz. 6:43 Dennis Haynes >>> <d23haynes57@HOTMAIL.COM> napisał(a): >>> >>>> What you really want to know is the total surface area of the >>>> piston(S) combination. This is calculated by the radius squared x

>>>> pi. >>>> A 3" piston has an area of 28.274 cu in. Two 1.5" piston have a >>>> total of only 14.137 cu in. >>>> >>>> With the original rotors being cast the wheel flange gets much of

>>>> its >>>> strength from the complete rotor piece. There is no way I would >>>> rely >>>> on the wheel flange part to mount the tire with the rotor disk >>>> and hat >>>> cut off and flange cut down to fit inside a different rotor. The >>>> threads alone are an issue as the rotors have a defined lifespan

>>>> and >>>> each time a wheel is mounted there is some wear and distorting of >>>> these threads. Have a machine shop make a hub from solid steel >>>> and use >>>> pressed in studs instead of lug bolts. This will also allow the >>>> flange >>>> to be placed for proper disk alignment or wheel spacing. >>>> >>>> I would also consider that a major change to the front brakes >>>> should >>>> also include a matching change to the rears. The rears contribute a >>>> lot more to stopping than many would think. A properly working rear >>>> set up has a lot of surface area. A real problem with the rears is >>>> that the aftermarket shoes do not have thick enough linings and >>>> without some compensation only part of the shoes contact the >>>> drums. I >>>> have posted a number times shimming the lower shoe rests out the

>>>> get >>>> more of the shoe to contact the drums. Also the rear brake pressure >>>> valve can fail causing poor rear brake action. With good pads up

>>>> front >>>> and the rears working properly the stock brakes can work quite >>>> well until you go to larger tires. >>>> >>>> Dennis >>>> >>>> -----Original Message----- >>>> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On >>>> Behalf Of ralph meyermann >>>> Sent: Thursday, February 02, 2012 8:58 PM >>>> To: vanagon@GERRY.VANAGON.COM >>>> Subject: Re: Jaguar vs Passat brakes on Vanagon >>>> >>>> Whats the total of piston diameters? >>>> >>>> Velma 82diesel 1.6 na westy >>>> >>>> On Feb 2, 2012 7:54 PM, "BenT Syncro" <syncro@gmail.com> wrote: >>>> >>>> Chris, >>>> >>>> At quick glance, the biggest difference is twin piston calipers for >>>> the Jag and single for the Passat's. >>>> >>>> >>>> BenT >>>> >>>> sent from my electronic leash >>>> >>>> >>>> On Feb 2, 2012, at 4:45 PM, "Chris S." <szpejankowski@GMAIL.COM>

>>>> wrote: >>>> >>>>> What's the list opinion ... >


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