bauerjab

I have an 87 911 with 930 brakes. I just bought 9x17 Fikses for the rear. (275/35. The passenger rear tire slightly rubs the oil line.
What are my options, e.g., spacer and/or modification of oil line.

Also, if I have to "modify" the oil line, how do I do it? Is it as simple as moving the bracket which holds the oil lines lower. Or do I need to purchase new oil lines.

Thanks

John

tchanson

John,
I would guess that you're running too much tire in the rear with 275's.

I use a 245/40 in the rear on 9" Fikses. Clearance is not an issue. I recall that Fikse recommends a maximum 255 width in the rear for that application.

Try contacting <a href="http://home.nycap.rr.com/wmv/" target="_blank">Bill Verburg</a> for some additional input. I believe that he was running 275's or 285's on 17" Kinesis wheels in the rear, but it involved oil line movement or modification.

Good luck,
Tim

Jim Michaels

I agree with Tim; 245s in the rear are very popular, at least on 16" rims. I would also consider 255s on 17" rims to be maximum for a Carrera. The bigger the wheels and tires, the greater the mass that little engine has to try to turn, so the slower the giddy-up. More rotating mass also reduces braking efficiency. These are some of the reasons why many track and autox guys prefer 16" rims with 245s on their Carreras.

But for now, you've got that oil line "polishing" problem that can be addressed in several ways. The most popular (as you suggested) are moving the oil line more inboard (get the big hammer) and/or adding a narrow spacer; even a 1/8" spacer should be enough, and that won't require you to fit longer studs. If you have some rear toe-in to spare, you could reduce toe-in a bit as well. I've been through the same thing, and after the adjustments you can place some white racers tape over that part of the oil line to see if you're still getting any rubbing.

Alan Herod

If you are located in the DC area, you should come to our tech (prep for VIR) on Saturday at ASG. One of our members runs a 275's on a heavily modified SC without special flares. He moved the oil lines. Understand that it was a process though in that he first went to aeroquip which still rubbed. He ended up running them through the car. Not a desirable choice in hot weather, but a good heat source in the winter, particularly if you are running headers. If you are not in the DC area you probably don't have a need to know concerning the acronyms.

Bill Verburg

Here's a pic of the wheel well on my Carrera, rims are 9.5x17 Kinesis w/ nominaly sized 275/40 tires(they actually are wider than that)


You can see that the oil line was relocted a bit further into the recessed shelf, and the nuts on the trailing arm were groud down. Its tight but has worked fine for quite a few years.

Here you can see how close it is

bauerjab

[quote]Originally posted by Bill Verburg:
<strong>Here's a pic of the wheel well on my Carrera, rims are 9.5x17 Kinesis w/ nominaly sized 275/40 tires(they actually are wider than that)


You can see that the oil line was relocted a bit further into the recessed shelf, and the nuts on the trailing arm were groud down. Its tight but has worked fine for quite a few years.

Here you can see how close it is

</strong><hr></blockquote>

bauerjab

Bill,

Thanks for the reply. I see the how the oil lines were lowered. Is it really that simple? I am asking because the oil lines are metal and it does not seem they can be lowered easily without the risk of causing some kind of kink or structural instability.

Also, with respect to the other posts regarding whether 275s can fit, I know for a fact they can because these wheels were taken off of a stock SC.

Thanks all

John

bauerjab

I forgot to ask. Where can I buy 1/8" spacers.

Thanks

John

JackOlsen

I run 275's under SC flares on 17-inch 2-piece Fuchs. I used an Aeroquip line to re-route the oil.



You've got to machine those two bolts on the springplate, too.

Roamer

John what offset do the wheels have, this determines what, if any spacing is necessary. You should check with Steve Timmin's site at <a href="http://www.instant-g.com" target="_blank">www.instant-g.com</a> where he outlines the offsets and spacing needed to fit 275's in the rear wheel wells. Steve told me that he is working on getting 285/30 R18's under his wife's car now!

Good luck!
<img src="graemlins/burnout.gif" border="0" alt="[burnout]" />

Bill Verburg

Neither Fuchs 9x16 w/ an o/s of +15mm & 245/45 tires nor my Kinesis 9.5x17 & 275/40 tire need a spacer. w/ the wide tires both sides are close to being in physical contact.

When I looked into Fikse they offered

• +18.6mm o/s 9s
• +12.3mm or +25mm o/s +9.5s
• +18.6mm o/s 10s

since a spacers width is subtrated from the o/s I figured the Fikse 9s w/ a 3.6mm spacer would fit like the Fuchs 9s, the Fikse 9.5 would need ~6mm spacer and the Fikse 10s would need a lot more work than I was willing to do.

bauerjab

To all:

Many thanks for all of the helpful responses. Unfortunately, I am out of town and can not determine the offsets of if a 1/9" spacer will solve the problem.

But two questions still remain.

1. I know I am going to have to lower the oil lines. Can I do this by merely pressing them down (or using a "big hammer"). Obviously, I am concerned about creating any structural weakness in the lines.

2. Assuming a 1/8" spacer solves the problems, where can I get one.

Once again, many thanks for all of your inputs.

John

Bill Verburg

Heat and gentle pressure applied as uniformly along the length of the piece works best.

bauerjab

Bill,

Thanks. Sorry for asking for more specifics.But...

When you say "heat," is running the car and heating the oil lines from the hot temperature of the oil sufficient? Or are you talking about an external source of heat such as a propane torch that "gently" heats the line.

Thanks in advance.

John

Bill Verburg

Both