You can see this header at:
http://picasaweb.google.com/Triosan/KingstonHeaderVerusPacesetter
The header John was referring to was supplied by Tony-Lindsey Dean of
Kingston ?? in the UK. By a qirk of construction mine now goes to a single
silencer under the passenger seat sice and exits straight down at the
entrance to the tunnel the exhaust pipe was supposed to go in. Loud
[beautiful in a race car, helmet cuts the noise].
On Wed, May 21, 2008 at 8:08 AM, John Macartney <
standardtriumph@btinternet.com> wrote:
> > Moving on to the TR6 with its longer runner 3-1 manifolds in terms of
> > breathing, and from a purely bar-room mechanic view of how a one-to-three
> > manifold might work, I would guess that there has to be some flow
> > differences between 1 & 3 compared to 2 (and 4 & 6 with 5) since the
> runner
> > length is different. Of course, I don't have a manifold to hand to look
> at
> > the runner I/Ds to see if they are smaller for any of the legs, or if
> there
> > are any flow shaping differences between the various legs of the
> manifold.
> > The differences in flow per cylinder will be less than that mentioned in
> > Witor's T2000 manifold tuning article, I'm sure, but I'd be interested to
> > learn what the difference was!
>
> Tony, if it helps, I've got a used Witor recommended manifold on my PI.
> It's the type I always
> recommend when this topic crops up as it's the 6-3-1 type. FWIW (and I
> believe the manifold in
> question is the former pattern from SAH and Triumphtune/Moss) the
> individual pipes are all (visibly)
> about the same length. Indeed, the pipe for #6 curves behind pipes 2 to 5
> and snicks neatly in to
> #1. Many of us in the UK believe this design is arguably the best because
> the scavenging effect is
> best and with pipes of roughly equal length it can be argued the *bangs*
> all have to travel an equal
> distance before getting mixed up with all the other *bangs*. Certainly,
> this set-up makes a
> phenomenal difference to performance as a whole and makes an overall noise
> that probably isn't legal
> through just one main silencer and a tailpipe resonator. Gives me a
> splitting headache after a
> while - but what the hell, you can hear everything is working just fine!
>
> Jonmac
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--
Chuck Arnold
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