1966 solid rotors to vented rotors

[Toronto66_911]

What do I need to do to switch very safely to vented rotors from stock solid front rotors on my 1966 911? If anyone has done this upgrade,could you list what I will need?
I am presently putting back on newly rebuilt calipers for the solid rotors that are re done by Davep (very nice knowledgable guy), from this site, and I will be gathering up all that is needed over the next few months to tackle this project.

Cheers
Peter

[Flieger]

Well, for a start you will need the spacers for between the new caliper halves. I am not sure about the hubs.

Eric Shea can surely tell you exactly what is needed.

[ajwans]

Get a set of Eric's Brembos and save yourself some weight at the
same time.

andy

[davep]

Yes, he does have the option of Brembo's, I'll show him the options when he visists next time. I believe that besides the vented rotors, he will require the proper hubs, or spacers & longer studs. I expect the proper hubs are the cheaper option.

Can later struts just bolt in?

[Neunelfer]

You'll need new hubs. That's about it.

The later hubs have 3.5-4mm of offset in them splitting the difference of a vented rotor. Spacers won't work as the offset is inward.

Studs are the same 45mm Verbus.

If you go with new struts you'll probably be best off with a new front end all together. The ball joints on the 66 are the issue here.

[davep]

http://forums.pelicanparts.com/showthread.php?t=473760

[Neunelfer]

Thanks for that link Dave,

This is very important as I get a lot of questions about "How can I run a vented rotor on my early 911? Is is as simple as bolting on a vented rotor and the proper caliper?"

The answer is; with a new hub. The critical measurement for the hub isn't actually shown so I took the liberty of doctoring the photo a bit.



An easy way of looking at this is:

#1 Solid Rotor
#2 20mm Rotor through 1983
#3 and #4 24mm Rotors on Carreras and up

Each time the rotor got wider, the calipers got a spacer and the hub moved a bit further outward to accommodate the thickness (the exception being the 24mm where the rotor was crafted to work on the same plane with an 11mm spacer in the A-Caliper vs. the standard 7mm spacer of the SC cars.)

The answer to Peter's question is #2. When moving from a solid rotor to a 20mm vented rotor you'll need the 1970 through 1983 type hub.

[911quest]

I ran vented rotors on the front of my '65 without switching the hubs. I had to use the 5mm '68 spacer in the front to keep the wheel from hitting the calipers. Changing the hubs is a more elegant solution but it can be done.

[davep]

I had to use the 5mm '68 spacer in the front to keep the wheel from hitting the calipers.

Ah, so in addition to the hubs, they used spacers with some hubs as well?
Other than the 930, what cars used spacers on the hubs as standard fitment?

[911quest]

The spacers were used on the rears of some '68 models probably to match the change in the front hub size. That is my interpation of the matter and might be incorrect.