For certain cowlings this 180 degree tuned manifold might fit
better. It is more compact. It is based on a 3 inch center line radius 180 degree
2" tubing bend. the center line distance is 6 X 3.1416 or 18.8 inches.
We need 24 so this comes out about right.

It is easier to make as there are fewer
tig welds than the front mounted configuration.

It is also really trick looking :)

Paul Lamar



Looks nice. What about having a very short "block hugger" style
intake manifold to the carb for better packaging and then a
plenum + long tube combo to give the needed length?

Vlad

It is possible that might work but the origin of the pulse that
energizes the intake manifold takes place right at the port.
I suspect that moving the carb near the port may seriously
affect the tuned system. I have not tried it however. For the
same reason you don't want to put the venturi and the butterfly
throttle somewhere in the middle of the runners. When the slide
throttle on the other hand is wide open for take off and for high altitude
cruise so it has no effect.

Paul Lamar