- Jan 2, 2019
- Reaction score
- My Car
1972 Mustang convertible, 351C 2V with FMX (#'s matching)
Currently equipped with 351C 4V 4BM, .060 over, roller cam, Sanderson block huggers, -AC
IMO, not sure about that as the rpm’s increase, the stock fan blades “spool up” and expand in towards radiator face and their OD is well past the ID of the shroud creating x?cfm of flow through it which I doubt would be affected by any air going into the open ducts on the hood and swirling around unmanaged. I could envision plug wires, accessorie wires, vacuum lines/hoses, etc. being whipped around in the engine bay like crazy with the intake air not being funneled into to a “functional” cold air box pumping directly into the intake manifold. A set of go pros mounted by the battery and WS washer reservoir for an experimental video would be cool to see if any of you that are running open ducts would take that on.In that case, it might actually improve flow through the radiator! It certainly helps to understand the boundary conditions. Considering the cross sectional areas involved, the effect is probably minimal whatever it may be.
I wonder if there are any youtube videos of 71-73's in a wind tunnel. That would be pretty cool to check out.