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Offline Pintocrazed

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Rotor swap
« on: August 09, 2014, 02:12:37 PM »
Anybody know if I can use 74 up rotors on my 73?the 73 rotors are crazy expensive

Offline dick1172762

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Re: Rotor swap
« Reply #1 on: August 09, 2014, 02:46:56 PM »
Plain and simple, NO.
Its better to be a has-been, than a never was.

Offline Pintocrazed

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Re: Rotor swap
« Reply #2 on: August 09, 2014, 03:39:53 PM »
:( I didn't want to spend 300 for rotors

Offline oldkayaker

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Re: Rotor swap
« Reply #3 on: August 09, 2014, 05:21:30 PM »
See bbobcat75's link for the differences in the rotors.  Rockauto is a little cheaper at $222 plus shipping for two ACDELCO 73 rotors.  Maybe put an ad in the wanted section.  Good luck.
http://www.fordpinto.com/pinto-faq/71-spindle-to-74-spindle/msg130024/#msg130024
Jerry J - Jupiter, Florida

Offline 65ShelbyClone

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Re: Rotor swap
« Reply #4 on: August 09, 2014, 08:08:18 PM »
What does the "hub reg" dimension refer to?
'72 Runabout - 2.3T, T5, MegaSquirt-II, 8", 5-lugs, big brakes.
'68 Mustang - Built roller 302, Toploader, 9", etc.

Offline Wittsend

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Re: Rotor swap
« Reply #5 on: August 09, 2014, 11:05:19 PM »
Do you live near a self service yard? The local Pick Your Part has rotors listed at $14.99 with a $3 core charge.  Probably $20 each out the door.  On the 50% off sale day about $13 each.  I know there aren't Pinto's every trip, but man, maybe I should be grabbing them when I can. If they Mic OK and aren't deeply grooved they are probably good.  For the record I did get a spare set a number of years ago because people were complaining they were $100 each.  Now $150!

Which brings up the subject..., can your rotors be turned? I think Pep Boys charged about $13 a rotor when I had my wife's Civic rotors turned.  I opted to have them turned figuring the warping had run its cycle. I felt new rotors would just warp again.  So far 9 months later everything is good.

Offline 65ShelbyClone

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Re: Rotor swap
« Reply #6 on: August 09, 2014, 11:07:25 PM »
I was thinking that it might be fairly trivial to machine the 74+ rotors, but I have access to a machine shop.  8) Not everyone does.
'72 Runabout - 2.3T, T5, MegaSquirt-II, 8", 5-lugs, big brakes.
'68 Mustang - Built roller 302, Toploader, 9", etc.

Offline oldkayaker

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Re: Rotor swap
« Reply #7 on: August 10, 2014, 06:24:47 AM »
I believe the "hub reg" refers to OD of the rotor hub where the factory steel wheels center themselves on the rotor.  I do know that the early factory steel wheels will not fit over the larger later year rotor hubs.

As far as machining a later year rotor down, I would have a concern with the later rotor "min thick" being larger that the early rotor "nom thick".

Since you are considering non-stock set up, this link shows how to install larger 5 lug rotors on the early spindle plus some other custom ideas.  Note, larger rotors usually require larger wheels.
http://www.fordpinto.com/pinto-faq/front-disc-brakes-(4-5-lug)/msg6498/#msg6498
Jerry J - Jupiter, Florida

Offline Pinto5.0

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Offline 65ShelbyClone

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Re: Rotor swap
« Reply #9 on: August 10, 2014, 11:58:03 AM »
I believe the "hub reg" refers to OD of the rotor hub where the factory steel wheels center themselves on the rotor.  I do know that the early factory steel wheels will not fit over the larger later year rotor hubs.

If that's the case, then turning the hub diameter down to the early size wouldn't be hard. Pretty common with Granada brake swaps going onto early Mustangs.

Quote
As far as machining a later year rotor down, I would have a concern with the later rotor "min thick" being larger that the early rotor "nom thick".


That's a definite consideration if the vent passages are wider in the later rotor....and they probably are to save weight and material.
'72 Runabout - 2.3T, T5, MegaSquirt-II, 8", 5-lugs, big brakes.
'68 Mustang - Built roller 302, Toploader, 9", etc.

Offline Pinto5.0

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Re: Rotor swap
« Reply #10 on: August 10, 2014, 10:15:16 PM »
I didn't take a micrometer to them but I've had early & late rotors side by side & the vents appear similar in size. Cutting late rotors down to work on an early car should leave plenty of material.
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'80 hatch(Restoring to be my son's 1st car)~Callisto
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