Im sure this has been covered before and it looks rice and whatever else but does it actually make for an increased air flow under the hood? so that the engine is cooler?

u would figure hot air rises so making a small gap for it to vent would be beneficial.

but theres also that old trick of lifting the bonnet at the front which proved to be non-beneficial as it didnt improve engine temperatures.

so has anyone got any proper physics into the equation?
or any recording of engine temperature differences.
simply putting a a thermo in there isnt the same because it just proves that more hot air is moving in that area not so much that the engine bay is hotter.