RE: [DML] Rear Calipers on Ebay

["John Hervey" <john@xxxxxxxxxxxxxxxx>]

Steve, Thank you very much. Not knowing the calculations the best I could
come up with is taking the 43 divided by 48 = about 10% x 2 = 20%. That's
why I didn't think it would be a good thing to use the calipers.
Here is what they look like.
http://www.specialtauto.com/delorean-parts/images/caliper-pistons-delovsjag.
jpg

Again, Thanks
John Hervey
www.deloreanautoparts.com
www.specialtauto.com

 

-----Original Message-----
From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of
Steve Stankiewicz
Sent: Friday, March 30, 2007 6:23 AM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: Re: [DML] Rear Calipers on Ebay

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@xxxxxxx>
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


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