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FSMITH010
Joined: 24 Apr 2009
Posts: 101
Location: Los Angeles, CA
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 Posted: Sat May 16, 2009 9:27 am Post subject: 933 and 928 calipers |
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I read that the 933 used 928 calipers.
Has anyone tried this or are the period 928 calipers no better than 931 or 944 calipers? |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Sat May 16, 2009 9:40 am Post subject: Re: 933 and 928 calipers |
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| FSMITH010 wrote: | I read that the 933 used 928 calipers.
Has anyone tried this or are the period 928 calipers no better than 931 or 944 calipers? |
Where did you read that?
The D-Prod parts list at 924.org for the 933 indicates same-era 930 calipers, of which I have a pair. It's possible that a 1980 928 used the same calipers as a 1980 930, but I haven't cross-referenced PET to find out.
In any event, it's a moot point, because you can't bolt up the calipers that were used on the 933 to a 931. The caliper bolt pattern is 89mm vs. the standard 76mm for 931/944 (non-M030) calipers. More details and photos here.
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erstwhile owner of just about every 924 variant ever made |
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FSMITH010
Joined: 24 Apr 2009
Posts: 101
Location: Los Angeles, CA
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| Posted: Sat May 16, 2009 10:39 am Post subject: Re: 933 and 928 calipers |
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| ideola wrote: |
Where did you read that? |
bah. forget, last night somewhere I could try and find it again.
| ideola wrote: | | The D-Prod parts list at 924.org for the 933 indicates same-era 930 calipers, of which I have a pair. It's possible that a 1980 928 used the same calipers as a 1980 930, but I haven't cross-referenced PET to find out. |
Ya, that is what I figured as I read it since I had read 930 also before. Actually the calipers and rotors aren't on that list anyways.
| ideola wrote: | | In any event, it's a moot point, because you can't bolt up the calipers that were used on the 933 to a 931. The caliper bolt pattern is 89mm vs. the standard 76mm for 931/944 (non-M030) calipers. More details and photos here. |
that would just require different carriers right? tried the 930 carriers or 928 carriers? |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Sat May 16, 2009 11:02 am Post subject: |
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I assumed you were referring to the fronts. AFAIK, the rear caliper spacing is the same for all of the rear disc-based 924/931/944/951 calipers (e.g. the Brembos have the same bolt pattern as the single pots in the rear). The front calipers are where the problem lies. The 933 apparently had its own custom spindle (at least based on the part number). So you would either need 933 spindles, or you'd have to develop a custom adapter bracket. Hardly worth it for bolting up 30 year old calipers design. If you went to the expense and trouble of fabbing/purchasing adapter brackets, might as well go with Wilwoods or the Brembos.
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erstwhile owner of just about every 924 variant ever made |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Sat May 16, 2009 2:08 pm Post subject: |
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FWIW, I ran the part numbers mentioned by Dan in the other thread about 933 brake parts, and the calipers came back as late 70s/early 80s 911 SC calipers, which are two pot, and still available new for a reasonable sum.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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williamoss
Joined: 14 Mar 2010
Posts: 8
Location: Tigard, Oregon
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| Posted: Mon Mar 15, 2010 7:52 am Post subject: 928 brakes |
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On my car a street model D production Sebring which came with 4 disks and a 5 bolt pattern it had 928 brakes. They worked great. The only propblem was when I went to buy pads and they asked what model car I had and I replied a 924 then told them I need the 928 pads there was alwasy a discussion untill the parts department looked at the car and then they sold me the 928 pads. It wa a funny bbut true story one of many of that great car.
William Moss
Tigard OR |
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leadfoot
Joined: 11 Dec 2002
Posts: 2222
Location: gOLD cOAST Australia
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| Posted: Mon Mar 15, 2010 12:13 pm Post subject: |
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have seen them on an S "as in sports model" came with trash can rims.
Stu
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1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress... |
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gegge
Joined: 27 Jul 2007
Posts: 1124
Location: Sweden
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| Posted: Tue Jun 08, 2010 9:04 pm Post subject: |
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| Rasta Monsta wrote: | | FWIW, I ran the part numbers mentioned by Dan in the other thread about 933 brake parts, and the calipers came back as late 70s/early 80s 911 SC calipers, which are two pot, and still available new for a reasonable sum. |
According to the FIA document, the Gr.4 homologisation for the 924 was with 48mm 2-pot callipers in the front. Just like contemporary 911:
Caliper typ M 69-76 76mm c-c
Caliper typ A 76-83
Caliper typ S 84-89
'A' calipers are stiffer than 'S'
Check page 18:
http://hms.dk/downloads/homologering/3075-Porsche.924.pdf
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Carl Fredrik Torkildsen
924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Wed Jun 09, 2010 4:46 am Post subject: |
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I believe this is correct. I have a pair of these calipers, in steel, and the mounting holes match the toofah spindle. Also of note, the vented rotor is the same part as the 911.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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