Robert E. Shlafer wrote:
>Poor flow, Bob???
>
>I think you MAY be mistaken. I've not seen
>anything other than opposite (at least, not
>yet!:).
>
>Empirical tests conducted by MiniMania
>show the stock alum head (with stock valve
>sizes) out of the box flows as well as a
>"prepared" Longman GT3.
>
>
>
>
Mini Mania's marketing claims don't really tell you much about the flow
test, and therefore it is impossible to refute. What test pressure was
used? What valve, and at what lift? Did it perform 30 % better over the
entire flow curve, or just at one data point?. I have not flow tested
the aluminum head, but have given it a good examination and commented on
some of the findings here. There is no way it can out flow a well
prepped head out of the box using standard size 1275 valves, except
maybe at a very low lift. The port throat is too large for ID of the
seat insert and this mismatch is a huge obstruction to flow. You only
need to stick your finger in the port from the chamber side and feel the
top side of the seat insert. It looks as though everything may just
clean up when boring out the ID of the inserts for 1.40" intakes, and
the OD of the inserts is large enough for 1.40 intakes.
John
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