Date: Mon, 27 Feb 2006 10:05:00 -0800
Reply-To: Bruce Nadig <motorbruce@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Bruce Nadig <motorbruce@HOTMAIL.COM>
Subject: Re: New IRS Axles vs 108mm Porsche CVs
Content-Type: text/plain; format=flowed
I hate to break it to you (pun intended), but there is more to putting on
Porsche 930 (Porsche 911 Turbo) CVs than just bolting and unbolting.
The bolt pattern of the 930 CV joint is different from that of the Vanagon.
This creates problems in two places: 1) output flanges from the
transmission, and 2) at the stub axle. In addition to installing 930 CV
joints, you will have to install new axles (I used Sway-A-Way racing axles -
I've forgotten what length axle I had to use, but I do remember that no
matter how carefully I measured things, I still went through three pairs
until I got the length right), modify the output flanges and do something
about the stub axles.
I purchased modified stub axles from McKenzie's Performance. McKensie's
welded closed the bolt holes for the "normal" Vanagon CV joints, machined
the surface flat, redrilled the stub axle for the 930 bolt pattern, threaded
the holes to accept the bolts that hold the CV to the stub axle, and also
left a raised lip around the edge that the 930 CV fits right into. IMPORTANT
NOTE: the threaded holes for the CV bolts were NOT metric threaded. That
means you will also have to hunt down new bolts of the correct length,
diameter, and thread pitch.
Is it worth it to switch to 930 CVs? Only if you have already made other
expensive modifications (such as greatly upgraded engine output). If you are
having chronic problems breaking stock axles or destroying stock CV joints
and you have only modest engine output (stock wbx, TIICO, or Subie
4-cylinder conversion) I would have to say that your problem probably does
not lie in the stock VW axles or CVs. Among other things, I would closely
examine driving style.
Please note that above I said "chronic problems", not the random failure of
a new part. New and refurbished parts can and do prematurely break. These
random events should be seen as outliers and not as solid data points. If,
however, you are regularly breaking new/refurbished axles or CVs, as I said
above, start with the problem and work to find a solution from there.
Switching to the 930 CVs is not called for in the vast majority of Vanagons,
even the vast majority of Vanagons on this list that may have modestly
upgraded engine output. The switch to 930 CVs is very expensive, and
somewhat involved.
I hope that this helps.
Cheers,
Bruce
motorbruce
motorbruce@hotmail.com
>From: Dave Mari <vw4x41987@YAHOO.COM>
>Reply-To: Dave Mari <vw4x41987@YAHOO.COM>
>To: vanagon@GERRY.VANAGON.COM
>Subject: New IRS Axles vs 108mm Porsche CVs
>Date: Sun, 26 Feb 2006 17:12:03 -0800
>
>How are the new IRS axles holding up? Most of the vendors are now selling
>them in place of OEM rebuilts. I have broken one in 5k miles and was now
>thinking about the 930s, but its big$$ as I could keep 2 spare new axles in
>the van for 1/2 the price.
> Dave :)
>
>eric abercrombie <ericsaddress@cox.net> wrote:
> You might be right about the return on investment. I went with the
>930's not because of any failures on my van, but because I've seen
>and heard of axles snapping in half. I guess I bought insurance as
>much as anything because I tend to break the rules about proceeding
>into remote places by myself.
>
>Former list member and all around nice guy ( Tim are you there ?)
>snapped two "new" replacement axles in his 2.5 subaru powered sycnro
>westfalia and not even while offroading
>
>Would the vendor who supplied those like to comment ?
>
>Picture of 930's on a custom axle next to stock 14"
>
>
>http://members.cox.net/91syncrowesty/New%20axles%20with%20930%
>20cv.jpg
>
>
>
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