http://www.teglerizer.com/dcoe/thecompa ... er%20pipes
Обратите внимание.
This is the crossover porting built from copper piping and brass compression fittings. The entries into the manifold throats were ground flush to match the profiles of the inner walls. The 'T' between manifolds (with the large outside thread) has not been tightened yet. This is the valve cover connection, and will be tightened after the carbs are mounted to the head. This allows for carb to carb, center-to-center variations.
You may ask why would you port the individual runners together? I believe for road use, a small amount of bleed over helps steady state cruising. Plus, to maintain proper crankcase pressure (vacuum) you still need a crankcase to intake vacuum tap.
The last little section of piping (that will connect to the valve cover), is designed to be 'crimped' to limit pressure pulses. Hence, the four throats would share a more common vacuum pulse interaction in comparison to that of any flowing into/out of, the crankcase. A standard in-line PCV valve will also be installed and tested here, as well as simply testing a 'crimped' connection to regulate the crankcase pressure.