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Eric_Shea |
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#1
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PMB Performance ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Admin Posts: 19,287 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains ![]() ![]() |
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! |
ConeDodger |
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#2
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Apex killer! ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 23,735 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California ![]() ![]() |
mmmmmmmmm.... Mine are the lightest! Yaaaa!!!
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Chris Hamilton |
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#3
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Senior Member ![]() ![]() ![]() Group: Members Posts: 611 Joined: 7-March 06 From: Berkeley, CA Member No.: 5,687 ![]() |
Those brembos are great. Light weight and cheap! I got some from the junkyard for my 912.
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andys |
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#4
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 2,165 Joined: 21-May 03 From: Valencia, CA Member No.: 721 Region Association: None ![]() ![]() |
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 |
Eric_Shea |
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#5
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PMB Performance ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Admin Posts: 19,287 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains ![]() ![]() |
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 |
Krieger |
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#6
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 4,752 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None ![]() ![]() |
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 |
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#7
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PMB Performance ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Admin Posts: 19,287 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains ![]() ![]() |
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 |
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#8
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 4,752 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None ![]() ![]() |
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 |
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#9
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 4,752 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None ![]() ![]() |
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 |
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#10
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rust free you say ? ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 16,375 Joined: 7-January 05 From: richmond, Va. Member No.: 3,419 Region Association: None ![]() |
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) |
Eric_Shea |
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#11
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PMB Performance ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Admin Posts: 19,287 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains ![]() ![]() |
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. |
Katmanken |
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#12
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You haven't seen me if anybody asks... ![]() ![]() ![]() ![]() Group: Members Posts: 4,738 Joined: 14-June 03 From: USA Member No.: 819 Region Association: Upper MidWest ![]() |
Dang,
I'm gonna drill mine full of lightening holes, go with hollow core pistons, and add small helium balloons. |
jmill |
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#13
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Green Hornet ![]() ![]() ![]() ![]() Group: Members Posts: 2,449 Joined: 9-May 08 From: Racine, Wisconsin Member No.: 9,038 Region Association: Upper MidWest ![]() |
Damn. I need some S calipers. My A's are boat anchors.
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Chris Hamilton |
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#14
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Senior Member ![]() ![]() ![]() Group: Members Posts: 611 Joined: 7-March 06 From: Berkeley, CA Member No.: 5,687 ![]() |
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 |
sixnotfour |
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#15
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914 Wizard ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 10,480 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains ![]() ![]() ![]() |
mine look like this PMB style
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Chris Hamilton |
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#16
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Senior Member ![]() ![]() ![]() Group: Members Posts: 611 Joined: 7-March 06 From: Berkeley, CA Member No.: 5,687 ![]() |
Wow those look nice!
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Chris Pincetich |
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#17
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B-) ![]() ![]() ![]() ![]() Group: Members Posts: 2,082 Joined: 3-October 05 From: Point Reyes Station, CA Member No.: 4,907 Region Association: Northern California ![]() |
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) |
ConeDodger |
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#18
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Apex killer! ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 23,735 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California ![]() ![]() |
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 |
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#19
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I can't Re Member ![]() ![]() ![]() ![]() Group: Members Posts: 4,564 Joined: 26-December 02 From: Agoura, CA Member No.: 21 Region Association: Southern California ![]() ![]() |
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 |
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#20
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PMB Performance ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Admin Posts: 19,287 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains ![]() ![]() |
QUOTE Eric - do you stock rebuild Brembos that look that nice? I usually stock a pair or two of those. |
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