Originally Posted by 64elko
my radiator is 21x20 4core........ running a 16 inch 2300 cfm fan,,,,,, ........
How many amps is your fan rated for? Who is the manufacture? This is setup as a puller? Some manufactures can be generious in their cfm ratings, Spal's "rule of thumb" is approx 10amps per 1000cfm.
When setups are space limiting and have to run elec fan(s) go with A QUALITY fan with as much size,amps and cfm will allow in fitment, sometimes have to run 2 fans and even staggering their mount position on a aluminum shroud. With higher amp draw you need a large enough alternator ,and wire it accordingly.