Do they open progressive (smal choke first, big choke later), or are they just like twin-SUs/Webers!?
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drmini in aust wrote:
Hmmm..
M1100, that pic brings up an interesting question- if a single SU can feed a port with intermittent flow characteristics, WHY does a twin SU manifold on a Mini need a balance pipe? A Weber one doesn't ....
Vizard said the balance pipe/port intersection on a BMC twin SU manifold is the worst contributor to its bad flow. Anyone ever filled a balance pipe with epoxy to see what happens?
Speedwell developed something pretty good:
http://www.mk1-performance-conversions. ... su_1_4.jpg
But they are verry hard to find.
I only saw a pair of them ever for sale (and missed to buy it
).
But... I guess they could easily be reproduced!
They seem to flow way better than the original twin-SU manifold.
(Hard to imagine, hmm?
)
Cheers,
Jan
