Model A Configuration and Date |
Main Venturi |
Secondary Venturi |
Main Jet |
Comp Jet |
Cap Jet |
Idle Jet |
---|---|---|---|---|---|---|
Jan 1928, US SB p209 Feb 1928, UK SB p127 |
24 | 10 | 20 16 |
18 | 19 | 10 |
Mar 1928, UK SB p138 | 24 | 10 | 20 | 18 | 19 | 10 |
Sep 1928, US SB p280 Nov 1928, UK SB p226 18.5 Throttle Plate was 20 |
27/32 | n/a | 19.5 | 19 | 21 | 11 |
Mar 1930, US SB p443 Jun 1930, UK SB p288 |
27/32 | n/a | 20 | 19 | 20 | 11 |
Typical Model A | .866 | n/a | Marked '20' | Marked '19' | Marked '20' | Marked '11' |
Model AF (small bore) Configuration and Date |
Main Venturi |
Secondary Venturi |
Main Jet |
Comp Jet |
Cap Jet |
Idle Jet |
Feb 1928, UK SB p127 | 21 | 9 | 16 | 16 | 17 | 9 |
Mar 1928, UK SB p138 | 20 | 10 | 17 | 16 | 16 | 10 |
Nov 1928, UK SB p226 | 18 | n/a | 16 | 17 | 16 | 11 |
Jun 1930, UK SB p288 | 18 | n/a | 16 | 17 | 16 | 11 |
From the table above, it can readily be seen that the primary differences between the Model A and Model AF are