914/6 rear caliper spacers, one solution Options

[McMark]

I've done a ton of research into the 308/914-6 caliper connection. Let me know if you have any questions regarding that.

Nice pins, BTW.

McMaster car sells M7 bolts, if that helps.

[michel richard]

Just looked at the McMaster Carr website. They do have 7mm hardware, but not socket head cap screws, at all, and not standard hex head in anything above 50 mm.

It looks like the closest they have is 8mm by 70mm. That would probably mean drilling the bolt holes in the caliper oversisze, and I don't want to do that to my unobtanium 914/6 calipers unless there is zero other choice.

The other alternative is to use the hardware off of core 911 calipers.

Michel

[davep]

I've been working on both conversions for about 6 years. Pins and spacers are different between the /4 and /6 calipers. Bolts are only available from core 911 calipers or if I have them custom made in the UK. Well, okay, I could get them made here for $14 each (minimum 50). They are grade 9.8, and the only others I could find were grade 8, and half the tensile strength. If there is sufficient interest I could place the order for the 100 minimum in the UK.

[Eric_Shea]

CODE

why don't you just order one of Eric's kits?

-4 and -6 calipers are different.

QUOTE

I guess I'd look at sourcing the next size OEM, and drilling and tapping.

(IMG:http://www.914world.com/bbs2/html/emoticons/ohmy.gif) OMG!! On 914-6 calipers? (IMG:http://www.914world.com/bbs2/html/emoticons/ohmy.gif)

It's really simple gang... get some core 'Rear 911 M-Calipers' Virtually everything you need is simply 'there'. Here's what it takes to do this conversion (detailed list)

*10mm Caliper Spacers (included, exact match in the rear 911 m-caliper)
*Longer Hardware (included, exact match in the rear 911 m-caliper)
*5mm Rotor Spacer (we can supply, they're not cheap but not too bad)
*Custom Pins (Michel has this sorted... for others plan on about $12-15 each at a decent machine shop)
*911 Rear Pad Spring Kit
*Longer Studs for the rear hubs (to accomodate the rotor spacer)

Now, consider how much it costs to get my V-Caliper kit, and I'm not raping anyone here... a pair of core 911 M-Calipers should go for $40-70 bucks. Think about it... $40-70 for 4 correct spacer and 8 correct bolts.

No brainer... it would be worth $100 or more to me if I wanted to do this to a -6 caliper.

[davep]

I agree with Eric. Find some junk 911 rear calipers. I've stripped about 10 calipers so far. Perhaps someone in California can raid a yard or two for us. Not too many left to raid in Utah or Ontario. Give Eric and myself a note if you can help.

[michel richard]

I phoned Parts Heaven and talked to Jeff. He agreed to take core calipers apart and to ship just the spacers and the bolts. US$ 40 !
I'll report when they arrive.
I then use regular 911 rear vented rotors, right ? If memory serves, the only thing that might happen is the need to turn down the outer diameter a couple of mm.
If all works out well in that area, the plan is to get spreader springs, the rotor spacers and longer studs from Eric.

[davep]

Turn the 911 rear rotor down to 286mm from 290mm.
I know it is not much but the extra weight and unused surface is detrimental. Also provides the needed clearance.

[michel richard]

I figured out that the pins that I made with the bosses were not ideal.
It looks like part of the job of those pins is to help center the spreader spring. So I turned another pair with a shorter mid-section.
Here's a picture of an orginal short pin (bottom) my first attempt (middle) and this morning's style of pin. This morning, I made the bosses longer and the mid-part the same length as on the original.

[michel richard]

And here's what the new pin looks like in the caliper. Once more, the spacers betwen the caliper halves in this picture are for mock-up purposes only.

[michel richard]

Got my spacers and bolts from Parts Heaven, and I'm pretty happy.
Here's what I got, four of these spacers, and eight bolts:

[michel richard]

And the calipers, assembled.

I still need to get the seals and new spreader springs from Eric Shea, but this is beginning to look like proper calipers. Note that the bolts are the appropriate length,

[Kargeek]

Here is how I utilized 914-6 calipers with 911 caliper spacers and vented rear rotors. In addition to splitting the calipers and 911 caliper spacers, I used a spacer between the caliper mounting bolts. I also wanted to use the stock dust shields so a spacer was fabbed between the dust shield and mounting bracket. DH

[Eric_Shea]

Way ta go Michel (IMG:http://www.914world.com/bbs2/html/emoticons/smilie_pokal.gif)

Kargeek (sorry no name in the sig)... I'm shocked that a spaced -6 caliper doesn't hit the arm with those spacers on the caliper ears. 914 calipers are usually so tight that customers have to take off the 10mm rear adjuster cap just to get the caliper to mount... (IMG:http://www.914world.com/bbs2/html/emoticons/ohmy.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif)

[Kargeek]

[QUOTE]Kargeek (sorry no name in the sig)... I'm shocked that a spaced -6 caliper doesn't hit the arm with those spacers on the caliper ears. 914 calipers are usually so tight that customers have to take off the 10mm rear adjuster cap just to get the caliper to mount...

Eric, I did this conversion 18 years ago with NOS 6 calipers, swapmeet 911 calipers for spacers and a local porsche shop supplied me the mounting spacers. I don't remember a problem with clearance...I haven't had the car apart since. Dave Hall-aka, Kargeek.

[Eric_Shea]

Dave... amazing. I can see the picture so I'z gots ta believe it.

[michel richard]

QUOTE (Kargeek @ Jan 31 2006, 07:55 PM)

Eric, I did this conversion 18 years ago with NOS 6 calipers, swapmeet 911 calipers for spacers and a local porsche shop supplied me the mounting spacers. I don't remember a problem with clearance...I haven't had the car apart since. Dave Hall-aka, Kargeek.

Pretty clean, for something that was done 18 years ago !

[rickyhgarcia]

Michel,

Check Eric´s work on my set of 914-6 GT rear calipers:

914-6 GT Rear Calipers