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> Caliper Weights, Deciding where you want your un/semi-sprung weight
Eric_Shea
post Feb 27 2010, 06:30 PM
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I finally had the time, the proper scale and all of the calipers varieties around to do a little comparison weighing. All calipers are without pins, springs and pads.

And the winners are:

Brembo Calipers = 4lbs. 6oz. (front 911 strut 3" spacing, or early 914 strut w/o caliper spacers, or late 914 strut with ClubHub 48mm pistons, #109 Pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360942664.1.jpg)

S-Calipers = 5lbs. 6oz. (front 911 strut with 3.5" spacing, 48mm pistons #45 pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360943317.1.jpg)

L-Caliper = 5lbs. 6oz. (rear early 65-68 911 caliper with 2.25" spacing 35mm pistons, #30 pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360943317.2.jpg)

Wide L-Caliper = 5lbs. 10oz. (rear early 911S 67-68, 38mm pistons, #30 pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360943318.3.jpg)

911 Rear M-Caliper = 6lbs. 2oz (rear 911 69-83, 38mm pistons, #31 pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360943318.4.jpg)

914 Rear Caliper = 6lbs. 10oz. (rear 914 All, 33mm pistons, #30 pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360943319.5.jpg)

914 Front Caliper = 6lbs. 14oz. (front 914 all, 42mm pistons, #31 pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360943319.6.jpg)

M-Caliper = 7lbs. 6oz. (911 & 914-6 Front, can be used on early 914 w/o spacers, 48mm pistons, #31 pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360943319.7.jpg)

A-Caliper = 9lbs. 2oz. (911SC all front 3.5" spacing, 48mm pistons, #45 pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360943320.8.jpg)

Wide A-Caliper = 9lbs. 4oz. (911 Carrera all 3.5" spacing, 48mm pistons, #45 pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360943320.9.jpg)
[same picture as above... just has 4mm wider spacers.]

Couple of things to note. The very lightest calipers and the very heaviest calipers share the same 48mm pistons and "almost" the same size pad. The 109 pad is the same pad as the BMW 320i... just as wide as the #45 pad but a couple of mm shorter.

Stands to reason a 3" 911T/914-6 strut with Brembo's is the lightest most effective system in this batch. Looking at the top and the bottom... you could shave almost 10lbs. of un-sprung/semi-sprung weight off your suspension and get the same performance!
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ConeDodger
post Feb 27 2010, 06:36 PM
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mmmmmmmmm.... Mine are the lightest! Yaaaa!!!
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Chris Hamilton
post Feb 27 2010, 08:23 PM
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Those brembos are great. Light weight and cheap! I got some from the junkyard for my 912.
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andys
post Feb 28 2010, 10:50 AM
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Eric,

These are the combined weight of two calipers, correct?
I've got the Carrera calipers and knew they were heavy even without something to compare to.

Andys
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Eric_Shea
post Feb 28 2010, 11:05 AM
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QUOTE
These are the combined weight of two calipers, correct?


No... that's one caliper.

I never have been a fan of those calipers on a 914 for the weight reason. They are fine calipers and pretty much a staple in the Porsche line-up since 1978 but there's a couple issues that make me not want them on my car:

1. The rotors are the 24mm vented rotor. This adds weight beyond the 20mm standard vented rotor. Rotational Mass is the last place you would want to add weight. I have "never" heard of a 914 that is braking properly that has ever experienced fade on a 20mm vented rotor. If you check the historics and the HSR 2 Litre Challenge, all of those cars are wheel to wheel racing... HARD... on 20mm rotors and 908/S-Calipers.

2. The weight of the caliper - As you can see, the S-Caliper is a full 8lbs lighter (we're talking pair now) and it has the same piston and pad area. S-Caliper pads are actually thicker for racing purposes.

That said, some say the S-Calipers flex. I have yet to experience this on any S-Calipers that I've had. I've gone through pad bedding procedures that left the brakes smoking and I was "looking" for flex at the time. I dub thee an "Internet Myth"... YMMV
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Krieger
post Feb 28 2010, 12:59 PM
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This is great info. Thanks. So I have my A calipers apart and they are very clean inside. The spacers that are in the centers are about 11mm thick. Are these considered wide A or regular?
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Eric_Shea
post Feb 28 2010, 01:00 PM
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Those are Wide A-Calipers. (what's with the "Andys" and the Carrera calipers?) (IMG:style_emoticons/default/biggrin.gif)
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Krieger
post Feb 28 2010, 01:05 PM
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That's the luck of the $40 swap meet find. A is for Andy anyway! (IMG:style_emoticons/default/biggrin.gif)
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Krieger
post Feb 28 2010, 01:12 PM
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So Eric, what is the difference between a 914/4 and /6 rear rotor? Diameter? I know the 4s are 1mm thicker and about half the price. I just need to drill some holes for the studs to pass through. I was thinking this may be a better way to go for my application.
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scotty b
post Feb 28 2010, 01:18 PM
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QUOTE(Chris Hamilton @ Feb 27 2010, 06:23 PM) *

Those brembos are great. Light weight and cheap! I got some from the junkyard for my 912.


What do they come on ? (IMG:style_emoticons/default/confused24.gif)
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Eric_Shea
post Feb 28 2010, 02:47 PM
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QUOTE
what is the difference between a 914/4 and /6 rear rotor? Diameter? I know the 4s are 1mm thicker


Diameter, not thickness. Once you machine the holes in the -4 rotors you're about even cost wise.
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Katmanken
post Feb 28 2010, 04:42 PM
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Dang,

I'm gonna drill mine full of lightening holes, go with hollow core pistons, and add small helium balloons.
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jmill
post Feb 28 2010, 04:55 PM
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Damn. I need some S calipers. My A's are boat anchors.
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Chris Hamilton
post Feb 28 2010, 07:42 PM
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QUOTE(scotty b @ Feb 28 2010, 11:18 AM) *

QUOTE(Chris Hamilton @ Feb 27 2010, 06:23 PM) *

Those brembos are great. Light weight and cheap! I got some from the junkyard for my 912.


What do they come on ? (IMG:style_emoticons/default/confused24.gif)



Various old italian cars. I got mine from an Alfa. They were like $40 a side. I had to go through them before I could put them on the car though.

They look like this
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sixnotfour
post Feb 28 2010, 07:58 PM
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mine look like this PMB style


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Chris Hamilton
post Feb 28 2010, 08:02 PM
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Wow those look nice!
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Chris Pincetich
post Mar 1 2010, 10:50 AM
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Nice (IMG:style_emoticons/default/beerchug.gif)
Eric - do you stock rebuild Brembos that look that nice?
Wonder what rear caliper Brembo options are out there, maybe with an e-brake??
(IMG:style_emoticons/default/smile.gif)
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ConeDodger
post Mar 1 2010, 12:17 PM
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It was almost a shame to cover them up with wheels... Until I stood on the brakes the first time!


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campbellcj
post Mar 1 2010, 11:06 PM
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Anybody got weights for the Boxster calipers? I may be heading in that direction if I follow-through with my latest crazy plans.
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Eric_Shea
post Mar 2 2010, 02:10 AM
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QUOTE
Eric - do you stock rebuild Brembos that look that nice?


I usually stock a pair or two of those.
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