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Joined: Jan 2014
Posts: 3,137
J
JW51 Offline OP
'Bolter
Anyone have “hands on” experience with how one of these runs on a 216/235?

(This is purely curiosity. I don’t own one or have a plan to own one.)

I have some vague memory of reading that the design was intended to equalize the runner length and eliminate 90 degree turns. I can no longer locate the source of that information.

Both of those goals make some theoretical sense.

Joined: Feb 2004
Posts: 27,000
H
Kettle Custodian (pot stirrer)
Eye candy- - - -the real problem with 90 degree turns is in the cylinder head, with no way to improve the situation, so anything that's done manifold-wise is the product of a collaboration between P.T. Barnum, Rube Goldberg, and W.C. Fields!
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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Joined: Dec 2008
Posts: 1,979
P
'Bolter
Any down-draft carburetor requires mixture to turn 90° below the throttle disc (toward left or right in the plenum), and then again 90° inward to align the manifold runner with the intake port.
No angles: side-draft only, like the Corvette (although the alignment is not perfect).

Equal length?
I'm not sure that's best, because the two pairs of cylinders drawing from the front & rear intake ports are strongly irregular because of the firing order: 1 5 3 6 2 4.
Cylinder 1 & 2 and 5 & 6 intake strokes are separated by 240°-480°-240°.
Only cylinders 3 & 4 have exactly equal intake strokes: 360°-360°-360°.


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