The 12 with 4 same size fans are likely F7's. The 1 with the large fan and 3 smaller fans is an F9.
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Show posts MenuQuote from: Car Bud on November 03, 2008, 01:08:10 PMif so why did Bachmann choose to number its UP engine #806?Artistic license. They used a design they already had rather than spend a huge amount of money on tooling for an accurate version.