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

Richard, as far as I know the opening underneath between front and engine is unaltered open since the 70is. The amount of air in this region to suck upwards behind the radiator is much bigger than the louvres, different engine size etc., which in my view seems to be more a fine tuning in relation.

But it could perhaps happen that the above mentioned effect is even bigger since e.g. the 1.6 Sigma engine is even smaller and more backwards mounted than a Trad Plus 8 which should result in a correspondingly bigger air gap.

There was a short film somewhere here, I recall also an American one, where the airflow on the outside of the car was tested by using stripes of fabric and you could clearly see where is low pressure and where is more pressure. I can‘t find it. The cowl was in my remembering more a low pressure area and the region behind the front wheel over the wing where the louvres are was definitely a very low pressure area (regarding air intake solutions).

Interesting also what Button writes, perhaps one must „help“ the radiator to get air flow through it with such an additional radiator. But first I would see what Guten gets as a result of his additional floor plate because for me it would be the more elegant solution.

Let us remind this thread is partly about air intake and partly about engine coolant. My contribution here is about engine coolant with priority...in my case the air intake would have to be altered if the engine coolant would better by using a floor plate. But that would be the next story.

BTW its all about the fun, it feels in a positive way as if we would improve our model steam engines from 1970

Thanks Heinz. Maybe this was video you were referring to.

https://youtu.be/uomfVKFBJ44

Thanks Richard, yes it is the video.

There must be a reason why the factory changed the direction of the side louvres a few years ago..?
Nick

They changed the louvres with the launch of the first Roadster series1. Only that car had an intake directly at the inside bonnet of the louvres.
My unimportant guess: MMC did some survey at that time, perhaps the airflow was better by changing the direction of the louvres. Then the following series had a different intake but now the tools for the bonnet had been altered and will still be used until today.

I know that i have mentioned this before but re: Craig's photo it is alledged that one can gain 12bhp by putting it there.

I would say I’ve gained 12 bhp easy including the remap !

When I had my 2014 4/4 remapped by Cain and including a K+N filter in standard airbox it produced 14bhp increase as measured on rolling road.

Next increase to 136 bhp was fitting of Librands tubular manifold and sports exhaust.

Thanks Heinz, you've reminded me that the first time I saw inverted louvres was on my 2005 roadster mk1. Mine had no inner fitting to the louvres as some others had.
The thing is though, have any tests of airflow under there been made since the change?
Nick

Funny thing. We had an ex bonnet maker here as a guest between Christmas and new year. I happened to mention the direction of the bonnet louvres in conversation about my bonnets and I had thought that it was to do with safety but he told me that it was changed specifically to accommodate the air intake on the first Roadsters. So there is your answer.