IIRC the rotors are almost the same diameter. The difference was in the actual swept area. The 'hat' part of the 4 cylinder rotor is larger diemeter so the disc surface is smaller. I'll try a drawing... 4 cyl 6 cyl || || || || ||__ || || \ ||____ || \__ || |__ || || || __ || __ || / ||____| ||__/ || || || || || || || NOT to scale but you get the idea... Ken Quoting Tom Jennings <tomj@xxxxxxx>: > On Wed, 7 Mar 2007, Sandwich Maker wrote: > > > iirc the 4-cyl rotors were solid; the calipers used extra thick pads > > to make the difference up. > > I'm not sure how much info I'm goin to try to put in the list. My > main point is interchange; what will fit what, since I consider > AMC to be a car kit parts manufacturer that encourages me to > swap parts in crazy combinations. > > I want to get all the brake dimensions, brands, replacement > part numbers. IDs of all the valving. IDs of the backing plate > flanges and caliper mounts and wheel cylinders. > > Brake parts (springs, etc), hoses, that sort of thing, probably > won't add. They can be usually scrounged. They could be added > to the list later if desired. > > Frank sent me a graphic of rear axle tube flange metrics, so > I'll try to work those up for amc15 and amc20 and add a column > for that. I know it can be derived from engine size etc but > having a column will make it searchable. > > Oh yeah, once it's in a spreadsheet I'll transform it into a > full ross reference: given a wheel cylinder (Bendix, rear, 13/16) > list all cars that used it, sort of thing. That comes "for free" > once the data is there. I guess it's the point of this exercize. > > (Someone shoudl do this sort of thing for engine, trans, > bellhousing, clutch, driveshaft, axle, ...) > _______________________________________________ > Amc-list mailing list > Amc-list@xxxxxxxxxxxx > http://www.amc-list.com/mailman/listinfo/amc-list > _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://www.amc-list.com/mailman/listinfo/amc-list