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I was a little incorrect with my previous post. You can't exactly remove or unplug 1 fan (when mounted on a shroud like Jim's) without greatly affecting the cooling ability of the remaining fan. Since air takes the path of least resistance, the fan would pull a lot of ambient air though the large inactive hole from the secondary unplugged fan and not through the fins of the radiator: A single fan can be mounted directly to the radiator. - Will offer the least amount of resistance at speed (>45mph). *Best option if capable of cooling in stop and go traffic.A single fan can be mounted to a shroud.- Will cool better than an unshrouded fan in stagnant (stop & go) traffic - due to larger surface area.A dual fan setup can be mounted to a shroud- Both must be functional.- Comparable to the single fan in terms of stagnant cooling ability & at speed restriction(if the shroud is the same size and fans are the same CFM)A dual fan setup can be mounted directly to the radiator-one or both can be running.-Comparable to the single fan (mounted directly to the radiator) if the CFMs are the same -in most cases its moreJim -the holes you have in your shroud would also be affected to a large degree in terms of its cooling ability in stagnant air. I can't really think of an easy way for you to test if a single fan would cool enough for you in the paddock short of ditching the whole shroud and fan setup and mounting one directly to the radiator itself. I'm not surprised that one was not enough when you simply unplugged the other (look at the above picture). I'd still like to see if one fan would be enough when mounted to the rad.FWIW, I bench tested a 16" Curved-blade SPAL fan (30A) and it spiked to 95A!!! at startup. I have one on my E36 M3 which I rarely turn on (because the factory pusher fan does most the work), but the one on my 1990 Mustang 5.0 actually dims the headlights, you can feel the load on the motor, and the volt meter drops for a second or two before stabilizing back at normal values.
I was a little incorrect with my previous post. You can't exactly remove or unplug 1 fan (when mounted on a shroud like Jim's) without greatly affecting the cooling ability of the remaining fan. Since air takes the path of least resistance, the fan would pull a lot of ambient air though the large inactive hole from the secondary unplugged fan and not through the fins of the radiator:
Jim -the holes you have in your shroud would also be affected to a large degree in terms of its cooling ability in stagnant air. I can't really think of an easy way for you to test if a single fan would cool enough for you in the paddock short of ditching the whole shroud and fan setup and mounting one directly to the radiator itself. I'm not surprised that one was not enough when you simply unplugged the other (look at the above picture). I'd still like to see if one fan would be enough when mounted to the rad.
FWIW, I bench tested a 16" Curved-blade SPAL fan (30A) and it spiked to 95A!!! at startup. I have one on my E36 M3 which I rarely turn on (because the factory pusher fan does most the work), but the one on my 1990 Mustang 5.0 actually dims the headlights, you can feel the load on the motor, and the volt meter drops for a second or two before stabilizing back at normal values.
