07-25-2014, 04:46 PM
Sorry to be away so long and VERY sorry to have missed the Rally.
The squirrel cage fan cfm is calculated to move enough air to pick up heat radiated from: exhaust components, engine radiated heat, generator winding contributed heat plus the heat rejected to coolant. Additionally the squirrel cage fan is the quietest mover of air (subject to conjecture) and is preferred by most builders. I agree with Tom, replace the bearings with ball vs sleeve and you'll be quite satisfied. Team Rahal has over 10,000 hours on their ball bearing fan .
The fan motor is fed directly from the generator terminal box in most cases and runs whenever the set produces an output. The newer Newell's use a belt-less squirrel cage. On 785, I have replaced the fan twice, not impressed with with belt-less but they do save space.
The squirrel cage fan cfm is calculated to move enough air to pick up heat radiated from: exhaust components, engine radiated heat, generator winding contributed heat plus the heat rejected to coolant. Additionally the squirrel cage fan is the quietest mover of air (subject to conjecture) and is preferred by most builders. I agree with Tom, replace the bearings with ball vs sleeve and you'll be quite satisfied. Team Rahal has over 10,000 hours on their ball bearing fan .
The fan motor is fed directly from the generator terminal box in most cases and runs whenever the set produces an output. The newer Newell's use a belt-less squirrel cage. On 785, I have replaced the fan twice, not impressed with with belt-less but they do save space.
Gordon Jones
2000-45'-2slide-#567