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> Eric Shea....found that rotor info finally, On Club site
r_towle
post Jan 17 2011, 07:34 PM
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Take a look here.
Three rotors...I knew I was not nuts.

http://www.914club.com/bbs2/index.php?showtopic=250740

Rich
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Eric_Shea
post Jan 17 2011, 08:17 PM
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The question wasn't if you were nuts or not... you are "here" so that part is self explanitory. (IMG:style_emoticons/default/welcome.png)

Perhaps we can open it up again though. The question was; if you imported the caliper "and" the rotor from one spindle to the next, would they fit? We have only two rotors to offer today and I would imagine if there is a mid-term rotor it was the later without the centering ring. I suspected that, if the caliper migrated over with the rotor to the various spindles (early or late), it would work (not sure what the ball joints have to do with the caliper offset but...). I just never had a pair of early struts and late struts in house to compare.

Maybe someone can help.

Will a 1970 caliper and rotor fit on a 1975 strut -- and vise-versa? The only reason I can see they wouldn't is the mounting ears may also play a part in the offset beyond that of what the caliper and rotor play. Calipers and rotors are of obvious differences.
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John Jentz
post Jan 18 2011, 09:09 AM
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QUOTE(r_towle @ Jan 17 2011, 10:34 PM) *

Take a look here.
Three rotors...I knew I was not nuts.

http://www.914club.com/bbs2/index.php?showtopic=250740

Rich

The PET shows only 2 rotors.

411 407 075
70-72 to chassis 47229 19032

411 407 075B
72-76 from chassis 47229 19033

I would think if there were a third rotor the PET would show it. Maybe a past owner had the hub centric ring machined off to use an early wheel.
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r_towle
post Jan 18 2011, 09:51 AM
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QUOTE(Eric_Shea @ Jan 17 2011, 11:17 PM) *

The question wasn't if you were nuts or not... you are "here" so that part is self explanitory. (IMG:style_emoticons/default/welcome.png)

Perhaps we can open it up again though. The question was; if you imported the caliper "and" the rotor from one spindle to the next, would they fit? We have only two rotors to offer today and I would imagine if there is a mid-term rotor it was the later without the centering ring. I suspected that, if the caliper migrated over with the rotor to the various spindles (early or late), it would work (not sure what the ball joints have to do with the caliper offset but...). I just never had a pair of early struts and late struts in house to compare.

Maybe someone can help.

Will a 1970 caliper and rotor fit on a 1975 strut -- and vise-versa? The only reason I can see they wouldn't is the mounting ears may also play a part in the offset beyond that of what the caliper and rotor play. Calipers and rotors are of obvious differences.


OK, I thought it was a different question.
Take early strut and put on late stuff....
I may have some fronts to do this...I have the struts.

I recall doing this the other way around abd the early cliper and rotor dont work/dont fit on the later strut.
Lemme see.

Rich
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rdauenhauer
post Aug 14 2012, 09:58 PM
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Was there ever a definitive answer to the last (I think) question posed:

Can you fit late front rotor & calipers to an early (3" threaded not wedge) strut, w/o interference?
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davep
post Aug 15 2012, 03:40 PM
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QUOTE(John Jentz @ Jan 18 2011, 09:09 AM) *

QUOTE(r_towle @ Jan 17 2011, 10:34 PM) *

Three rotors...I knew I was not nuts.

The PET shows only 2 rotors.

411 407 075
70-72 to chassis 47229 19032

411 407 075B
72-76 from chassis 47229 19033

I would think if there were a third rotor the PET would show it. Maybe a past owner had the hub centric ring machined off to use an early wheel.

I remember having all three rotors on hand at one time.
411 407 075A was the later style without the hubcentric ring. It was one of those parts that was used in production, but was not available as a spare part. Parts books got updated and the superceded parts were removed.
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rdauenhauer
post Aug 16 2012, 05:56 AM
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QUOTE(rdauenhauer @ Aug 14 2012, 10:58 PM) *

Was there ever a definitive answer to the last (I think) question posed:

Can you fit late front rotor & calipers to an early (3" threaded not wedge) strut, w/o interference?


(IMG:style_emoticons/default/blink.gif) Bueller, Bueller ?
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Eric_Shea
post Aug 16 2012, 09:37 AM
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No
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rdauenhauer
post Aug 17 2012, 06:43 AM
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Yer Killin me....
No they wont work, no there wasn't an answer
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Eric_Shea
post Aug 17 2012, 07:12 AM
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If I'm reading correctly all of the posts above; no, there's no answer yet. I don't deal with enough -4 struts to test the theory.
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MoveQik
post Aug 17 2012, 07:26 AM
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QUOTE(John Jentz @ Jan 18 2011, 10:09 AM) *

Maybe a past owner had the hub centric ring machined off to use an early wheel.

FWIW, my were machined off when I bought my car. I didn't know this until I went to replace the cheap wheels the PO had on it with some Fuchs. (IMG:style_emoticons/default/dry.gif)
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rdauenhauer
post Aug 20 2012, 07:26 AM
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Ok I needed an answer so I pulled out some parts to test fittment (IMG:style_emoticons/default/wacko.gif)


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sixnotfour
post Aug 20 2012, 07:34 AM
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Way to go Rich !!
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Eric_Shea
post Aug 20 2012, 09:29 AM
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McMark
post Aug 20 2012, 10:20 AM
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914Sixer
post Aug 20 2012, 05:51 PM
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Dave is correct that there were 3 different rotors. This information is available in Dr 914's book of 700 Tips. I do not have a copy at this time but the break down is there. The offset of the early strut is different, the late rotor is thicker, early and late calipers have different offset, the backing plates are different. Those are some of the differences I can remember of the top of my head.
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rdauenhauer
post Aug 25 2012, 10:51 PM
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Ok Ok... I got a bit preoccupied w/ Finals. (IMG:style_emoticons/default/confused24.gif)

So the answer is ....YES!
not really interested in this debate as to whether or not there were 2 or 3 different rotor/hat variants, but there are 2 available currently, Early 70-72 and late 73->.

First some pics of what were working with, Early vs late struts, back plates, rotors & calipers.


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Eric_Shea
post Aug 26 2012, 05:31 AM
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Very useful information. That's what I suspected. Thanks for taking the time to clear this up. Practical applications:

You want to run a rotor with a centering ring on your early car (found a pair of late Fuchs?) - Use late model calipers and rotors.

You want the deeper pad depth of the later caliper on your early car (longer lasting for racing or street applications) - Again, use the late model caliper and rotor combo.

You want to run the lightweight Brembo calipers without the spacers on your later car - Use the early rotor.

You want to run 911 Fuchs on your 914 and simply stud the rotor (slightly less expensive than studding the rotor and machining off the centering ring) - Early Calipers and Rotors. It might be more initially to purchase the early calipers but after you change out rotors a couple of times, that cost would be realized.

Thanks again Rich.
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rdauenhauer
post Aug 26 2012, 09:18 AM
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One thing I might add is dependent on your early car, you may have to change (or remove) your backing plates (dust shield).
With the early style installed the late rotors will not seat on the spindle.


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