What were 17'' 964 Cup Racing wheels made of?
09-02-2006, 11:47 AM
#16
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Originally Posted by cupcar
Your RSA may have the original front wheels moved to the back and either Borbet copies or original Porsche Turbo 9 inch rear wheels.
Last edited by Cupcar; 09-02-2006 at 08:10 PM.
09-02-2006, 05:16 PM
#17
I believe that those wheels were being offered for sale by JC. There are 2 different sets 1 8x17 ET52 from an RS cup, 1 9x17 ET55 also from a cup.
I thought I had some pics of the 9.5s but I can't find them right now. They may have been trabnsferred to an archieve cd
I thought I had some pics of the 9.5s but I can't find them right now. They may have been trabnsferred to an archieve cd
09-02-2006, 06:56 PM
#18
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Originally Posted by Bill Verburg
I believe that those wheels were being offered for sale by JC. There are 2 different sets 1 8x17 ET52 from an RS cup, 1 9x17 ET55 also from a cup.
I thought I had some pics of the 9.5s but I can't find them right now. They may have been trabnsferred to an archieve cd
I thought I had some pics of the 9.5s but I can't find them right now. They may have been trabnsferred to an archieve cd
09-02-2006, 07:25 PM
#19
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Cupcar & Bill,
Thanks for the additional information. With that, I'll do some checking. I'm hoping to have a set of new shoes for springtime.
Noah
Thanks for the additional information. With that, I'll do some checking. I'm hoping to have a set of new shoes for springtime.
Noah
09-05-2006, 10:48 AM
#20
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A little late but may be of some help.
The standard wheels Cup1's and all other alloys I have seen made use an alloy that appears to be identical to each. I have been trying to get the composition of it for a while but can only find similar alloys. The centers of the 3 piece speedlines off the 94 turbo use this same alloy as that used on the cup1's. They are an aluminum-based alloy not magnesium although they are very high in Silicon and Magnesium.
The silicon used in the Aluminum alloy wheels is there to add strength and magnesium is added for machinability. When you get into high Silicon aluminum alloys you will find that even standard band saw steel blades dull quickly when trying to cut the material. These alloys are very strong when heat-treated properly.
The magnesium used on the "magnesium" Cup wheels is also an alloy I would say closer to some of the standard aircraft magnesium alloys used like AZ91. These alloys have upwards of 9% aluminum and 1% zinc. Magnesium alloys usually weigh 1/3rd less than their aluminum counterpart based on alloying ratios and although they weigh less are much more susceptible to cracking or breaking than the aluminum alloys. So, there is a trade off, weight for strength.
The standard wheels Cup1's and all other alloys I have seen made use an alloy that appears to be identical to each. I have been trying to get the composition of it for a while but can only find similar alloys. The centers of the 3 piece speedlines off the 94 turbo use this same alloy as that used on the cup1's. They are an aluminum-based alloy not magnesium although they are very high in Silicon and Magnesium.
The silicon used in the Aluminum alloy wheels is there to add strength and magnesium is added for machinability. When you get into high Silicon aluminum alloys you will find that even standard band saw steel blades dull quickly when trying to cut the material. These alloys are very strong when heat-treated properly.
The magnesium used on the "magnesium" Cup wheels is also an alloy I would say closer to some of the standard aircraft magnesium alloys used like AZ91. These alloys have upwards of 9% aluminum and 1% zinc. Magnesium alloys usually weigh 1/3rd less than their aluminum counterpart based on alloying ratios and although they weigh less are much more susceptible to cracking or breaking than the aluminum alloys. So, there is a trade off, weight for strength.
