Here is a solution that works in terms of achieving your end goal--keeping that Sunbeam cool. A Derale Pusher Fan 11.75" pushes through over 2200cfms, fits perfect and does the trick. I have one on my Tiger along with the 6 blade fan, no issues in hot Nevada or Napa Valley in the middle of the summer.
Bill
Bill - is this the fan you are using? Summit Racing Part Number DER-16925
Electric Fan, Single, 11.75 in. Diameter, Pusher, 2,210 cfm, Black, Plastic
"Universal Yes
Flow Direction (Application) Pusher
Is this the fan you are using? I hope so. If it is I may purchase one as it may help solve an issue that I have with my 302 V8 Alpine. Thanks.