i'm on my 2nd set of spacers for an '86 951 and both sets have been a no-go so far. hoping someone can identify a problem with my hubs or an explanation why both sets so far haven't worked.

i started out with a set of 15mm H&R #3095716 and it appeared that maybe the upper most lip of the spacer wasn't going to allow the spacer over the hub. i then ordered a cheaper style spacer off of ebay that did not have that lip, but the step down in this spacer was still too much. you can see in the pics, once that tighter step hits the outer edge of the hub, it won't go any farther. based on ordering the proper spacers/part #s for an '86 951, can someone shed some light on what the issue might be with the hubs?

are these not '86 hubs? i was pretty sure they were, but i can't figure out why 2 sets of spacers haven't worked now.

the last photo is the first H&R attempted.

 

Looks like the spacers are designed for the hubs where the brake rotor mounts from the outside, not the inside.

 

I but those spacers work no-problem on the rear of the car.

The front, because of the wheel bearing, needs a different size bore on the inside. You can see it's catching on that step.

Take those to a machine shop, perhaps with a hub, and they'll be able to "fix" them for you.

 

The front wheel bearing and dust cap/cover stick out on the 86 944 turbo. You will need to have the spacers machined to fit over them. That cover/dust cap cause issues with spacers and with later model wheels as well.

 

i wasn't aware the '86 hubs wouldn't accept standard hub-centric spacers. thanks everyone.

are there no spacers made for the '86 hubs that are still hub-centric?

 

I don't know - I've just machined my own out.

 

Thanks Van

 

The spacers DO fit over the hub and is hub-centric. The issue is the width of the hub-centric interface. The inner-part fits over the hub just fine, but the outside is too small to continue all the way in due to the bearing-cap and stuff on the outside. It's just a simple matter to grind/enlarge the ID of the bore on the outer 1/2 of the spacer. The inner 1/2 will fit over the factory hub-ring just fine and be hub-centric. The outer 1/2 wil have needed clearance. Don't over enlarge the ID though, just enough to get it on and leave as much material on the outside for the wheel to rest on.

 

Had the same problem first time I had spacers on the fronts.
As others said, you need to machine the spacers.

 

I'm having the same issue with my 1" HC spacers, but after looking at them and taking some rough measurements I discovered something. They do in fact sit flush against the hub with an additional 8mm flat spacer behind the 1" studded adapter, but they are no longer hub centric. Measuring from the front lip of the rear bevel to the rear lip of the hub centric lip, there is 14.25mm of material on my 25mm spacers. 23mm clearance is what is needed to clear the dust shield. Obviously this means its impossible to have a spacer less than 32mm thick that is also hub centric and will also clear the dust cap. If you dont mind losing hub centricity, you can just mill out the ID of the hole from the bak a few mm, down to a depth of about 9mm deep from rear face after the bevel.

 

I just put it on a lathe so I can access the back side, and with a boring bar, I make it a little larger and deeper until it fits. Then it's still hub-centric.

 

i've already spoken to Mayo Perf. about milling out the center, but their lathe is currently inop. i'll text Tom again today and see if he can refer me to someone. otherwise, i'll just ship them straight to Van!

 

with the idea of leaving material of the spacer 'flange' in mind, it seemed to me it was going to be hard to leave anything after milling - for hub-centric fitment. pics below show the 'base' ID at 71+mm and the OD of the flange at the same 71+mm. once milled, there should be nothing of the flange left really. the same held true for my H&R spacers as well. the best i can seem to hope for a small lip at the base of the flange - on the aftermarket set. the H&R (flange) goes straight down and cuts into the spacer surface a small amount and doesn't seem likely to leave any material at all after milling.

 

I don't think your ID needs to be much bigger, it just needs to be deeper.

Take a sharpie, color the internal surfaces, then try and put it on. Where there is an interference, it'll rub the ink away.

 

Yelp, just lengthen the bore. That's what I had to do on mine. Funny tho, when I replaced the old spacers with H&R new ones I did not have this problem.