Best FUNCTIONAL Vented hood for FC3S?

[Phoenix7]

Originally Posted by nissanconvert

This series of articles is well worth a look. There's far more science here than i've seen in most threads on the subject. But, until someone mentions at the very least wool tufts (preferably pictures at speed) i'm not going to believe that washers or an ebay duct/hood are as functional as the seller says.

Ok, explain that picture to me then. What am I looking at?

From the article you posted:

With extra exit vents in the bonnet preventing any build-up in engine bay pressure, best flow through the radiator is gained. (Of course, you can substitute ‘intercooler’ or ‘oil cooler’ for radiator, if in fact their exit flows are also into the engine bay.)


So the airflow through a radiator doesn’t depend on the pressure in front of the core; it depends on the pressure difference across the core. IOTW, the air exit is just as important as the air entrance – if the air exits aren’t big enough (or the airflow doesn’t pas through them quickly enough), pressure will build up on the downstream side of the heat exchanger, decreasing the flow that’s occurring through it.

The one you posted is a good one but it's of the Aerodynamic Forces of the Rx7 and I'd like for someone to explain it to me.

The ones people should be focusing on are: