Grill and valence block, summer port opening size?
For those who have blocked off air access to the radiator with grill and valence blocks, what size is the opening that you leave for cooling air?
I have two 4" diameter ports, which are about 12.5 square inches each for a total of 25 square inches open area. This is the only open area leading to the radiator, other than cracks around the edges of grill trim. The radiator is in a "tunnel" so from the front end, there is no other large place for air to enter.
I am seeing coolant temps running about 198F to 206F during highway driving, with ambient temps between 40F and 60F. I do not see coolant temp cycling much so I do not believe the fan is kicking in much. These are acceptable coolant temps to me for now, but I wonder about summer.
25 square inches seems to be not quite enough of an opening. The motor is a 1.6 liter Nissan.
Summer is coming, what do you think is a good port size for summer weather? It gets up to about 100F max ambient here in MI.
