Date: Wed, 20 Oct 2010 07:51:34 -0400
Reply-To: Michael Snow <slowmachine82@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Michael Snow <slowmachine82@GMAIL.COM>
Subject: Re: Speaking of heat and rubber.. CV boots?
In-Reply-To: <AANLkTi=h9AxuwN2+5rL6w=isUZnpKxxWzQ+vxm6qN4zb@mail.gmail.com>
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On Tue, Oct 19, 2010 at 9:49 PM, Don Hanson <dhanson928@gmail.com> wrote:
> The Inline Tuners tell me that about 30" is the
> correct length for the primary 'runners' on the dual downpipe manifold that
> is the best one for the ABA motor..30" and then you merge the two into one
> and on to the cat and muffler. I am thinking in order to get that length in
> a Vanagon installation I shall turn the pipes forward...run them along the
> driver's side of the motor then cross under the nose of the tranny and
> return along the passenger side..
>
> In order to preserve full ground clearance, I am thinking I might go just
> below the CV joints...I shall probably have to make some type of heat shield
> to keep the boots from being too hot...especially when stopped with the
> motor going...Right?
>
> My alternate plan is to simply make the downpipes as long as I can get to
> fit, configured like my current system....guessing I can put about 24-29"
> inchers in there, doing it like my single down pipe current exhaust....But
> that will mean some power I don't get from having the full optimum length.
> It should still be a significantly better breathing system than the tiny
> single pipe that is sharply bent and crudely welded that I am running so
> far....
>
> The tuners (Techtonic Tuning in Or.) tell me they dyno out ABA motors,
> with just this one exhaust change, and see them usually gaining 10-12hp..I'd
> like that, for just the cost of a nice fall drive to Bend to the exhaust
> shop and some fab time $ using all the parts I have and the manifold that
> came with my $300 motor...
>
> Don Hanson
>
I've never measured the pipes on my TiiCo conversion, but the primary
pipes are pretty long and don't go below the axles. There are photos
in the Yahoo TiiCo group files, and I have attached one that will make
it through to your pmail but not the list. All other things being
equal, long pipes normally provide more low-end torque than shorter
pipes, so this is worth some effort. I would not route the exhaust
below the axle under any circumstances.
--
Michael Snow
1987 Syncro TiiCo
1982 Westfalia 1.9TD
http://slowmachine82.blogspot.com/
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