Date: Sun, 2 Sep 2012 21:06:41 -0700
Reply-To: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject: Re: '88 Exhaust help
In-Reply-To: <20120902154903.ba2d9648c4914d5f56715942772a6035.02aa962594.wbe@email02.secureserver.net>
Content-Type: text/plain; charset=UTF-8; format=flowed
You might want to check if your RTV silicone says 'sensor safe' on it.
generally ..it's a no-no to use a sealant like that where there is an
oxygen sensor - sensor contamination can result.
Though sealants these days often say sensor safe on the tube.
there's the 1-3 forward exhaust pipe, and the 2-4 rear one. But no 1-2 I
can think of.
you can run a straight pipe ...or even a straight pipe inside a hollow cat.
A piece of EMT conduit fits perfectly....just guessing.
It might be that hardly anyone makes one as it would be illegal in many
places to do so.
There has been such an official part like that of course, once upon a
time. Perhaps still.
it will help slightly with power.
a good cat is best. A hollow cat is not that good, exhaust flow wise.
a straight pipe is very slightly better.
On 9/2/2012 3:49 PM, Gregory Smith wrote:
> Update on my new exhaust pipe tribulations.
>
> I loosened all the joints and actually removed the 2-1 manifold to make
> sure I could get it clean. Removed large elbow to CAT. Manhandled the
> header pipes until they were as aligned as I could get them.
> Reinstalled 2-1 manifold and gaskets using high temp copper RTV silicone
> for good measure. Reinstalled large elbow with new hardware and
> gaskets. Re-tightened all other connections. Allowed to cure for a
> couple of days. A brief test drive today revealed no leaks, I love that
> mellow metallic rasp that a properly muffled engine, especially it seems
> a boxer, makes. Thanks for the encouragement.
>
> A related question; does anyone make a "test pipe" for substitution
> where the CAT is and would it help with running and/or power? My rig is
> otherwise stock engine-wise.
>
> Gregory Smith
> '88 Vanagon GL
>
> Smith Design Studio
> Small Building Company
> Olympia, WA
> 360-239-0429
> gregoryfsmith.com
>
> -------- Original Message --------
> Subject: Re: '88 Exhaust help
> From: Stephen Grisanti <bike2vcu@yahoo.com>
> Date: Wed, August 29, 2012 10:23 am
> To: vanagon@GERRY.VANAGON.COM, Gregory Smith <gfs@GREGORYFSMITH.COM>
>
> Mine was like this when I replaced it this time last year, the flanges
> of the two header crossover pipes met the collector flange at a slight V
> angle. I was able to use some Permatex Copper Spray Gasket (recommended
> by one of the Advance Auto guys) and load up the mating surfaces
> adequately for a good seal. Still holding.
>
> After I was done, someone wisely suggested that I should have
> belt-sanded the uneven mating surfaces to try leveling them and had I
> thought of this before testing successfully I'd have done so. Try
> belt-sanding first and use the copper stuff as insurance.
>
> Also, the other reply about loosening everything up and tightening it
> all incrementally is a good idea in any case. That way, you do not
> preload any single piece in the wrong position.
>
> Stephen
>
> --- On Wed, 8/29/12, Gregory Smith <gfs@GREGORYFSMITH.COM> wrote:
>
> From: Gregory Smith <gfs@GREGORYFSMITH.COM>
> Subject: '88 Exhaust help
> To: vanagon@GERRY.VANAGON.COM
> Date: Wednesday, August 29, 2012, 11:52 AM
>
> Hi gang,
>
> I recently had to replace my header pipes and 2-1 manifold. I'll spare
> the horror stories of getting the old rusty parts off. Except to
> mention the one broken stud that took more than 4 hours to coax out
> using heat, PB Blaster, vice grips and patience. And a sawzall is sure
> handy.
>
> Anyway, the new pipes and gaskets are great, but I can't seem to get the
> dual-pipes-to-manifold joint to seal, where I have a noticeable leak.
>
> I think I need to loosen everything and start tightening at this
> particular joint, but any suggestions are appreciated.
>
> Gregory Smith
> '88 Vanagon GL
>
> Smith Design Studio
> Small Building Company
> Olympia, WA
> 360-239-0429
> gregoryfsmith.com
>
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