Quote:
Originally Posted by taff2
The driveability is fine, idles good etc, it works just like a blower manifold, it also has a large connecting passageway between the two plenums, so each cylinder can pull from a massive volume. As for cylinder robbing, in a normal manifold the flow from the carb chokes 'bends' to each manifold runner as the valve on that cylinder opens, mine does the same.,only the flow stream also has a direct line of sight from the plenum to the back of the valves, no choke point at the pushrod bulge, no swerving around a 'swan neck'. Cylinder to cylinder distribution is very good going by my plug readings. This siamesed port arrangement has been around a long time-it was used in Austin Mini engines from the '60's with a capacity of just 1.0 litre and driveability was fine with them. They could also be tuned to quite a high hp per cylinder . David Vizard did a lot of development work with these A series engines before he moved to the States.
To work with a Torker type manifold you would have to port the heads in the same way as mine- the port dividing wall between each pair of ports in the heads is cut back into the ports by around 1"- this opens up the pushrod choke area (there is now virtually no choke area there 'til close to 10,000 rpm ), and the line of sight is considerably straighter to each valve. It would take a bit of work to cut the dividing walls out of a single 4 barrel manifold, probably about half the work you've already done!
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The next time you take the manifold off see if you can snap a picture or two of the cut back divider in the head . Just curious how it looks..
Id like to try this one day and see how I like it.. Sounds like by doing this you take a lot of know how of porting the runner out of the game .. Just a straight open shot , not much to think about with that .. Thanks for explaining it ...