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Old 1 Jan 2018, 09:57 (Ref:3790098)   #1
Escort TC
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Need Help Homologation

I am looking for help with homologation specialists. I look in the homologation sheets 650 (RS1800 Grp4)and 1605(RS1600 Grp2) the "Monte Carlo" brake. I can find 265x20mm discs and 280x25mm discs, but not the 260x25.
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Old 1 Jan 2018, 11:34 (Ref:3790110)   #2
Tel 911S
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I am looking for help with homologation specialists. I look in the homologation sheets 650 (RS1800 Grp4)and 1605(RS1600 Grp2) the "Monte Carlo" brake. I can find 265x20mm discs and 280x25mm discs, but not the 260x25.
The Gp4 RS1800 would have been running 15 inch wheels in "Monte " spec , which is why the 280mm or larger diameter discs were used .
I am guessing that a 260x25 mm disc is so that it can run on 13 inch wheels using the "Monte" brakes .
This is not on the Homologation papers because it was not used at that time .

But without spending hours reading up Appendix J of the correct period , I believe it was allowed to machine & remove materials from parts , but not to add to them .
So machining a 280x25mm disc down to 260x25mm ,[ or just using one of that size ] , would be normally allowed & complies with Historic rules .
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Old 1 Jan 2018, 13:26 (Ref:3790115)   #3
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The disc thickness isnít mentioned on the extension referring to the large diameter discs, which as stated above, were able to be used with 15Ē wheels from July 1974. As I have 304mm diameter on my car I know they are 25mm.....

Iíd just be a little concerned that if 260 x 25mm wasnít used in period, it would prohibit itís use now- BUT as the Monte Carlo caliper is commonly used with small discs and 13Ē wheels, I guess it must be acceptable!
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Old 1 Jan 2018, 14:54 (Ref:3790126)   #4
Tel 911S
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The disc thickness isnít mentioned on the extension referring to the large diameter discs, which as stated above, were able to be used with 15Ē wheels from July 1974. As I have 304mm diameter on my car I know they are 25mm.....

Iíd just be a little concerned that if 260 x 25mm wasnít used in period, it would prohibit itís use now- BUT as the Monte Carlo caliper is commonly used with small discs and 13Ē wheels, I guess it must be acceptable!
Well , actually Mike , the 300mm dia discs are quoted as 31.75mm thick in the Homologation .

But as the measurements are quoted as maximum,s , then I think it is allowed to machine smaller . As in the 280mm x 25mm discs being cut down to 260mm x 25mm .
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Old 1 Jan 2018, 16:21 (Ref:3790140)   #5
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Well , actually Mike , the 300mm dia discs are quoted as 31.75mm thick in the Homologation .
Whoops, I was assuming- but itís a long time since they were fitted!
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Old 2 Jan 2018, 13:06 (Ref:3790300)   #6
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Thank you for the help
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Old 3 Jan 2018, 05:17 (Ref:3790403)   #7
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terence should be qualifying in the top 10 on the gridterence should be qualifying in the top 10 on the grid
Mtech brakes could no doubt help in your search.
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Old 4 Jan 2018, 23:06 (Ref:3790739)   #8
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In both Gp2 and 4 (last version of Appendix J, 1981), discs can be reduced (but larger ones must be homologated) and callipers cannot be modified and alternative callipers must be homologated - but with no minimum production quantity.

The 650 (Gp4) papers are of course for the mythical "Escort RS", not the RS1800. The only homologated RS1800 under that Appendix J is by "evolution" of the 1605 Mk1 RS1600.
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