I am not sure that the air scoops will keep the air flow in the cylinder, the Weston UK site has some pictures of the recomended air scoop and this shows how th4e air is forced to flow through the fins as the side plates capture the whole engine.

[link=http://www.westonuk.co.uk/westonuk2_036.htm]WestonUK RCV page[/link]

On yours do the side plates but right up to the engine fins, if they do not then the air can escape around the outside of the fins. Additionally, if the end of the surve does not fit well against the fins then the air can escape backwards. Finally, with the V formation some of the air could short circuit out of the top of the fins, I would consider a blanking plate between the two air scoops to prevent this.

I have a pair of RCV60SPs in my Mosquito (I know it is not radial cowl but it is another example), I go in through the scale air scoop on the cowl chin, have a curved air scoop with side plates that fit closely to the fins so all the air flows upwards through the fins, it then turns around in the top of the cowl and goes down around the crankcase, some of it spills out around the scale exhaust slots and some carries on down around the WestonUK in cowl silencer and through a slots by the model exhausts. This works well and as the Mossie is 18-19lbs in flying condition the engines have to work hard.

The photos show

1. The air scoops in the cowl along with the mounts for the exhaust stacks
2. The cowls in place showing the tight fit between the fins and the air scoops so all incoming air has to flow through the fins
3. The air inlet into the scoop in the cowl chin
4. The air outlets at the back of the exhaust stacks which are by the side of the crankcase, as these holes are at the bottom of the exhaust stack the air has to flow through the fins and past the crankcase before exiting
5. The slots in the bottom of the cowl to ensure some air flows over the in cowl exhuast.
6. Shows the engine in the cowl without the scoop showing the in cowl exhausts.

Peter.