One other point Paul, I like your compact manifold for its simplicity,
but I think there is VE to be gained by using tuned lengths, have you
considered a rolled 32 inch primary manifold?

Hans

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Which manifold. The one in the last 3D is not complete. For max torque
and max BSFC at 6000 RPM the optimum runner length is around 25 inches.
Max HP is around 7000 RPM with this manifold length.

Optimum exhaust pipe length is 32 inches long because the speed of
sound
is 1700 FPS in the hot exhaust gases rather than 1000 FPS in the cool
intake > manifold air.
Paul Lamar

-------------------------------------
Right, I meant the TC exhaust manifold, thought you would know that
from the 32 inch reference.

Hans

Yes in theory but no room for it and more work to fabricate.

Paul Lamar ...No rotor no motor.

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