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] > To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/