Paul Lamar wrote:

Just to reiterate here are some pertinent graphs from Kuchemann & Weber
yet again. Placing a large rad within ten to fifteen inches from the block,
intake manifold, exhaust manifold (no matter how cool) or firewall is a
no no if you want it to work well. It is particularly important
with a two inch thin or thinner rad (what we are dealing with here) as
the flow velocity is higher than about 40% of the forward velocity.

Not necessarily, and in fact generally not so.  Thinner radiators typically have larger
frontal profile, which means that for the same size duct input, the pressure recovery
diffusion for the thinner radiator will cause the flow *velocity* to be *slower* than that of
the thicker radiator (assuming core volume remains constant).

But otherwise what Paul says is generally true.

Russell Kent

Well perhaps if it were not for the additional aerodynamic drag of the thicker 
core causing  less air to flow through it. The volume of the core held
constant.
 
Paul Lamar
 
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