New Hood Mod! NACA Ducts!

[thedutchguy]

Me think you brave man to take two days of !

[iamjacksadrenalgland]

actually, NACA ducts are designed to vent air out from under the hood. there's a pressure difference between air flowing over the hood and air trapped under the hood.

this issue was debated at great length on a porsche forum that i used to belong to when 944 owners considered using hoods set up with NACA ducts plumbed to their intakes.

... and now for today's automotive fun facts ...

in 1979 porsche decided to build a turbocharged version of their normally aspirated 924. in order to accomodate the extra heat generated, they fashioned an NACA duct directly over the exhaust manifold/turbocharger.

in 1981 porsche offered a limited production 924 carrera GT which utilized an intercooler between the turbocharger outlet and the intake manifold. the resulting temperature drop allowed for more boost and more power. in order to provide airflow over the top mounted intercooler, they fashioned a large scoop on the hood.