> 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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