[DML] Re: Rear Calipers on Ebay

["Harold McElraft" <hmcelraft@xxxxxxx>]

Ok - I see. You made me look it up like I should have to start. Like 
a hydraulic lift - a multiplier is involved. It would appear then 
that straying far from the oem specs could lead to some strange 
braking. A good lesson.

Harold McElraft - 3354


--- In dmcnews@xxxxxxxxxxxxxxx, Steve Stankiewicz <protodelorean@...> 
wrote:
>
> Not quite.  In a hydraulic system, the pressure (force per unit 
area on an enclosed liquid) is the same throughout, but not 
necessarily the force.  The force is calculated by multiplying the 
pressure by the area.  (In this case, the piston.)
> 
> In this case, the Delorean's piston is 48mm and the Jaguar is 43mm  
The areas are 1809mm^2 and 1451mm^2 respectively.  The difference is 
358mm^2 or 20%!
> 
> So, given the same mastercylinder, proportioning valve and pedal 
effort, the jaguar rear calipers will impart 20% less braking force 
on the rear as the original Delorean calipers.  That's a lot more 
significant than the 5% figures being thrown around.
>  
> Steve
> 
> VIN 2650 ("Project Delorean")
> www.projectdelorean.com
> 
> 
> 
> ----- Original Message ----
> From: Harold McElraft <hmcelraft@...>
> To: dmcnews@xxxxxxxxxxxxxxx
> Sent: Thursday, March 29, 2007 9:41:38 PM
> Subject: Re: [DML] Rear Calipers on Ebay
> 
> Actually from the physics thing - I think you will find that force 
> being applied at the caliper from the brake pedal is unchanged and 
> the pistons are the distribution medium. Therefore, the force is 
the 
> same it is just being distributed over a smaller area. Does that 
make 
> a difference in the braking? I don't know because the action on the 
> pads would have to be evaluated - but, I doubt if much is lost.
> 
> Harold McElraft - 3354
> 
> [very long quote trimmed by moderator]
>




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