Talk Morgan Forums Morgan Sports Cars Maintenance & Servicing Air Intake improvements

Robbie,
we visited this year for a few hours on a cruise & it didn't rain. We loved the place & the roads must be epic in Norway.
John

Button,
it is to do with what is called the stoichiometric mix. That is the ratio of fuel to air to get the biggest bang for your buck.
If the air is hot it is less dense and has fewer O2 molecule per cylinder full on the inlet stroke. So you need less fuel to get the right mix but you also get less power on ignition.
If the air is colder it is denser so more O2 molecules & so more fuel can be added per cylinder & thus more power.
Of course you can also make the air or air fuel mix denser by compressing it with a turbo or a supercharger & ideally an intercooler.

The air will be turbulent across the bonnet (with a Reynolds number of over 2000) but that is why the louvres on the Roadster face forward to help the air flow in under pressure of driving forward rather that trying to suck in from a low pressure eddy zone if the louvres face backward. The traditional louvres are there to vent air out not in from the engine bay & the eddy will help suck it out.

Hope that helps.
John