Modern light planes commonly use the flat - 8 configuration instead as it is lighter and easier to air cool , in addition it can be manufactured in modular designs sharing components with flat - 4 and flat - 6 engines .
Modern light planes commonly use the flat - 8 configuration instead as it is lighter and easier to air cool . 
 In addition it can be manufactured in modular designs sharing components with flat - 4 and flat - 6 engines .