Some speculation on a 74+ big bearing 5x4.5 rotor |
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jhggtsf
Member Joined: 16-January-2016 Location: Metro Detroit Status: Offline Points: 140 |
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Posted: 20-October-2019 at 6:25PM |
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This might be a giant waste of a few hours but here goes...
I've been reading up on past threads brake rotor upgrades and the issue with the 5 on 5 lug pattern for the 12 inch rotor that is a bolt on. Would be nice to have a 12 inch with 5 on 4.5 because reasons. Having some time to kill I did some Rock Auto catalog mining. If you click on the part numbers in a list on Rock Auto it gives you the other applications that use the same part. Clicking on the rotor part numbers was no help, how about the bearings? Our '74+ big bearing spindles use WJB WTA12 for the outer and WJB WTA18 for the inner, to pick the first manufacturer in the list. Click on "WTA12" and you get... nuts! "Results may be incomplete due to size of result set" looks like everyone and their sister used this bearing. Dead end for now. Click on "WTA18" and you get some more useful results. All our familiar 70's Ford mid and full size. Some truck applications that probably aren't 5 lug. Lots of Mopar. Start at the top: Chrysler Imperial '74-'75. Looking up a 74 Imperial rotor gets you this little guy: RAYBESTOS 7034R $35
5 on 4.5 and 11 3/4 inches - our "12 inch" is 6040R is 11 13/16 so pretty close on the diameter. Overall height is bigger, 4.984 - 4.829 = 0.155, less that a quarter, more than an eighth. 0.06 inch of that is in the thickness of the rotor. No dimension for the hub diameter which sucks. None of the other manufacturers list it either that I could find. Checking the bearings, inner is WTA 18 of course, that's how we got here. Outer is WTA 16. The Centric listing has a nice picture with dimensions. 410.91012 is for our 74 up application, 410.91018 is the Chrysler, and bingo, the inner diameter of the inner race which the spindle goes into is the same: So it would fit on our spindle with the Chrysler bearings. Would it work? Can't tell without better drawings. Or parts in hand. Maybe you guys already know the rotor thickness kills it - don't have enough experience with these cars to say. I checked u-pull yards local to me and none of the Chrysler products were in. I did pick up the Continental/Mark caliper brackets though. Worth popping 35 bucks to do an experiment?
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Joe
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russosborne
Senior Member Joined: 01-January-2015 Location: Glendale AZ Status: Offline Points: 664 |
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Very interesting. Hope to hear more. Russ
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californiajohnny
Moderator Group Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14609 |
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idk but chances are the rotor offset could be different as to the fit inline with the caliper????
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JOHN
74 GRAN TORINO S&H CLONE 74 VETTE CUSTOM 90 S10 BLAZER 4X4 LIFTED 77 CELICA CUSTOM 75 V8 MONZA SUPERCHARGED 79 COURIER VERT. SLAMMED 75 VEGA V6 5 SPD 70 CHEV C10 P/U 68 MUSTANG FB CONVERSION |
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Rockatansky
Senior Member Joined: 30-July-2010 Location: On The Road Status: Offline Points: 6072 |
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bearing center distance would be the first thing to check, and offset
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72 GT Ute
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russosborne
Senior Member Joined: 01-January-2015 Location: Glendale AZ Status: Offline Points: 664 |
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Have a thought. I'd be willing (after the end of the month) to pitch in $5 or $10 for someone who knows what they are doing to buy this and the bearings to try out. Anybody else willing to do that, and anyone wanting to actually be the one to try it? I would think that there are enough of us who are interested in the big brakes to make this feasible. Thanks, Russ
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jhggtsf
Member Joined: 16-January-2016 Location: Metro Detroit Status: Offline Points: 140 |
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Hey Russ, I ended up ordering one of these rotors and the bearings; they should be showing up here in a couple days. Not sure when I can get to it though I have had some issues come up in the interim but hopefully won't be too long.
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Joe
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mkshelton
Senior Member Joined: 14-March-2012 Location: Sierra Vista Status: Offline Points: 357 |
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Thanks thanks for stepping up to the plate!
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"Sometimes I wonder if I'm actually UNinventing the wheel"
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russosborne
Senior Member Joined: 01-January-2015 Location: Glendale AZ Status: Offline Points: 664 |
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Yes, big thanks. My offer still stands if you want it.
Not a rush on my end. Russ
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