Hi
1303 you bring up some good points. The hot air that has done its work is larger in volume so its needs an easy path to escape.
On my 1302 I only had the stock grilles in the front apron AC front apron and the spent air went over my frame head and onto the road. It gets pretty hot in Sydney during summer (25-40 Celsius) and I never had any issues, the cooling fan only came on after standing in traffic and at around 50 - 60 kph the forward motion was enough to keep enough airflow through the radiator to keep the motor cool.
One mistake I did make was trying to keep the motor to cool with an adjustable fan switch, once I assigned the switching duties to my ECU it all worked great.
I’m not sure what sort bug your building Bugscandrift, perhaps you can let us know so we can offer better advise.
Steve
