CLOSE RATIO GEARS --"SA" ?

[jl46]

Hello All,
I have a MCS built 3 Feb 1966. Engine # 9F-SA-Y/xxxxx .
Does the "SA" in this number signifi that I have a set of Close Ratio Gears
in this engine ?

Thanks for your help
Jim

[mk1]

Cooper S variants
970cc
9F/Sa/X         Engine numbers 29001-29003 with Tecalamit filter
9FD/Sa/X      Closed circuit breathing introduced with Tecalamit filter
9FE/Sa/X      Closed circuit breathing, oil filter with oil light switch introduced
9F/Sa/X        Engine numbers 29039-30029 Purolator oil filter with oil light switch and closed
                       circuit breathing
1070cc
9F/Sa/H       Engine numbers 26501 to 33660 and 19201 to 20410
9FD/Sa/H    Engine numbers 33661 to 33948 with closed circuit breathing and oil light switch in
                     oil filter head
1275cc
9F/Sa/Y        Engine numbers 31001 to 31504 pre closed circuit breathing with Purolator oil filter
9FD/Sa/Y    Closed circuit breathing with oil light switch on filter housing after engine number
                     32178
9FE/Sa/Y    Closed circuit breathing with oil light switch on Purolator filter housing and piston
                    design change
9F/Sa/Y       From engine number 32378 onward, closed circuit breathing with Purolator filter
                    with oil light switch, Aeg510 camshaft introduced at engine number 40006, cross-
                    drilled EN40Bcrank at engine number 42730 and metal dipstick tube at engine
                    number 42548 onward
12H397       Cooper S Mk3 with dynamo, negative earth and Tuiftrided EN16T crankshaft
12H398       Cooper S Mk3 with alternator, negative earth and Tuftrided EN16T crankshaft
 
Note: Only Cooper S engines with prefix '9F' had EN40B forged steel, nitrided crankshafts.

[jl46]

Thanks Mark,
I guess I could have been clearer with my question.

I just want to to understand how most if not all of the 1275 Cooper S
engines (1964-1971) and gear boxes were configured.

9F = Cooper
SA= Mk 1 and Mk II transmission with close ratio gears.
Y = 9.75: 1 compression

Is it fair to say that most if not all were built as above and therefore
had close ratio gearing ?

Thanks,
Jim

[mk1]

No, Close ratio gears were an option. They were never offered as standard, only as an option.

options.jpg

[Simon776]

The 'SA' indicates remote control, close ratio gearbox, three synchromesh.

The Cooper and S had closer ratio gears than other Mini's so it means the standard Cooper/S gearset.