Gary Wolf wrote:

Paul,
   I have been looking at the photos of the steel intake manifold and have a
question about the 2 into 1 area. I generally use a shape such as this for
exhaust manifolds where the flow is in the other direction, but have been
afraid to use this type of transition for intake flow.
   I am concerned about the possibility of there being a difference in the
flow between the outside edges and the centre, where the goilet shape is. I
have not done a flow test to confirm this, which is why I am asking.
   Instead I usually use a separate tube for each cylinder, belled at the
inlet ends, and freestanding in a large plenum. The sides of the plenum are
far enough away from the tubes to ensure that there is no shrouding of any
particular tube.
   Could you comment about the merits and deficiencies of each method?

                                                Gary Wolf

This is Bill Hughes's design so I will let him comment. Bill are you there?
BTW this looks very much like a copy of the stock Mazda manifold to me
(except lower and lighter). I could be wrong.
 
Paul Lamar
 
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