Ift it's based on an iron 7 port head then the design and origin was
scandanavian not Mini Spares. Still that doesn't help. The iron 5 port
design
was well established but the re-work by Pierce's contactors didn't improve
the flow.
Weslake-Monza 1330
In a message dated 31/08/2009 02:55:31 GMT Daylight Time,
bugeye15@hotmail.com writes:
Interesting that you say that the MGB X-flow head isn't a Pierce design.
It appears that "new" A series head isn't a pierce design either.
The email I have says that it is similar to the MiniSport design head.
it appears to me that it is the same as the Minisport but Aluminum instead
of cast iron,
and funded by Pierce and Dr. Ferrillo
This is what Minisport has to say about their X-flow head.
Product Description:
Image Illustration Only
Cast in iron to the highest standards, this is truly a cylinder head to
enhance any performance engine from fast road up to full race specification.
It has many fantastic features that make it one of the most attractive
additions to any Mini, not least of all that it fits under the original bonnet
without modification.
Its advantages over other heads of this breed make it the winning choice
for the original A-series tuner. Using 7 ports (4 inlets, 3 exhausts)
optimizes power achievement along with compatibility with all the currently
available 5 port performance parts.
Twin inlet manifolds are cast one piece with the head, and in standard
form these accept two twin barrel side draught 40mm carburetors, or
alternatively they can be opened out to suit larger 45mm carburetors.
Retaining the 3 exhaust ports allows any widely available _ A _ or _ A+ _
series type exhaust manifolds and systems to be used.
Likewise any A-series cam (standard or competition) and any valve train
components fit straight on.
Thanks to 1.2mm of extra space between valve centerlines, this head also
accepts big valves. Or if standard to slightly oversize valves are used, the
risk of cracking between inlet and exhaust are greatly reduced.
The 7 port cross flow head has shown great success in real competition, as
it was fitted to all the top Danish team works cars.
Under tests carried out on a standard (with the exception of 1.5mm
rockers) MG Metro, the head increased the maximum power to 100 HP. This huge
increase is due to the use of 4 inlet ports and the cross flow construction.
We also have a 7 port head fitted to a hill climb 1380 Mini, with a full
race engine and Weber Alpha injection system, which is producing 150bhp +,
with only a 10:1 compression ratio. So, as you can see the potential is
massive!!!
..........
As you know, I am far from an expert on these things, just passing along
some info.
If I had the funds, I would like to try it.
Brian S.
Bugeyeracer finally resto'ed!
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