Down Draft Out - Hayden In

[cmillsap]

Hi Curt,

Several people have made this conversion but I have not seen where the CFM of the new fan is compared to the original squirrel cage fan. I would hope that the BB engineers sized the squirrel cage fan properly. I do know that with the original setup, my generator coolant temp maintains itself to a constantly close 160*F. I think most of the squirrel cage motors were wired to run constantly off the generator power. So I'm thinking the Hyden style fan's CFM output should be close to the same as the old fan. If it is less; the radiator may overheat. If it is more; the thermostat may be working overtime to provide a constant coolant temp through the engine. In addition, the adapter shroud's design will have an impact on the CFM throughput. The squirrel cage shroud provides a captured enclosure which ensures a constant CFM through the radiator.

Chuck