The MGA With An Attitude
SPEEDOMETER MODELS for MGA - ST-110
There were at least three dozen different Smiths-Jaeger speedometers used for MGA, grouped under two dozen differnet BMC part numbers. Aside from MPH, KPH, and two different face styles, there would be a different speedometer for each different final drive ratio available in the rear axle. Additionally there were speedometers with special accuracy for police use.
| MGA Speedometers
|
BMC
number |
Smiths
number |
Application |
mph/
kph |
Turns
Per * |
Axle Ratio |
Notes |
Beam Lamp |
| (unknown) |
(unknown) |
Early 1500 (to 14089) |
mph |
1536 |
4.555:1 |
O |
|
| AHH 5184 |
51-116-104-01
SN.6104/01 |
Early 1500 (to 14089) |
kph |
950 |
4.555:1 |
O |
|
| AHH 5185 |
51-116-104-02
SN.6104/02 |
Early 1500 (to 14089) |
mph |
1450 |
4.300:1 |
S |
|
| AHH 5186 |
51-116-104-03
SN6104/03 |
Early 1500 (to 14089) |
kph |
900 |
4.300:1 |
S |
|
| 17H 292 |
SN.6104/06
SN.6161/06 |
1500/1600/Twin Cam |
mph |
1440 |
4.300:1 |
S |
blue |
| 17H 293 |
SN.6104/07
SN.6161/07 |
1500/1600/Twin Cam |
kph |
900 |
4.300:1 |
S |
|
| 17H 294 |
SN.6104/08
SN.6161/08 |
1500/1600/Twin Cam |
mph |
1450 |
4.300:1 |
P |
|
| 17H 295 |
SN.6104/09
SN.6104/17
SN.6161/17 |
1500/1600/Twin Cam |
mph |
1536 |
4.555:1 |
O |
|
| 17H 296 |
SN.6104/10
SN.6104/18
SN.6161/18 |
1500/1600/Twin Cam |
kph |
950 |
4.555:1 |
O |
|
| 17H 297 |
SN.6104/11
SN.6161/20 |
1500/1600/Twin Cam |
mph |
1536 |
4.555:1 |
P |
|
| (none) |
(none) |
Twin Cam |
mph |
1730 |
5.125:1 |
O |
|
| (none) |
(none) |
Twin Cam |
kph |
1070 |
5.125:1 |
O |
|
MGA Speedometers (continued)
|
BMC
number |
Smiths
number |
Application |
mph/
kph |
Turns
Per * |
Axle Ratio |
Notes |
Beam Lamp |
| BHA 4060 |
SN.6104/12
SN.6161/12 |
1500/1600/Twin Cam
and 1600-MK-II |
mph |
1376 |
4.100:1 |
O, S2 |
|
| BHA 4061 |
SN.6104/13
SN.6161/13 |
1500/1600/Twin Cam
and 1600-MK-II |
kph |
840 |
4.100:1 |
O, S2 |
|
| BHA 4062 |
SN.6104/14
SN.6161/14 |
1500/1600/Twin Cam
and 1600-MK-II |
mph |
1376 |
4.100:1 |
O, S2 |
blue |
| BHA 4068 |
SN.6104/15
SN.6161/15 |
All models |
mph |
1325 |
3.909:1 |
O |
|
| BHA 4069 |
SN.6104/16
SN.6161/16 |
All models |
kph |
825 |
3.909:1 |
O |
|
| BHA 4128 |
SN.6161/25 |
Twin Cam |
mph |
1625 |
4.875:1 |
O |
|
| BHA 4129 |
SN.6161/26 |
Twin Cam |
kph |
1025 |
4.875:1 |
O |
|
| BHA 4145 |
SN.6161/21 |
1600 (from June 1959) |
mph |
1440 |
4.300:1 |
P |
|
| BHA 4220 |
SN.6161/30 |
1600-MK-II |
mph |
1536 |
4.555:1 |
O |
|
| BHA 4221 |
SN.6161/31 |
1600-MK-II |
kph |
950 |
4.555:1 |
O |
|
| BHA 4222 |
SN.6161/32 |
1600-MK-II |
kph |
950 |
4.555:1 |
O |
blue |
| BHA 4226 |
SN.6161/33 |
1600-MK-II |
kph |
840 |
4.100:1 |
S2 |
blue |
| BHA 4227 |
SN.6161/22 |
1600-MK-II |
kph |
840 |
4.100:1 |
P |
|
NOTES:
 1.) The change in Smiths numbers from 6104 to 6161 occurred in September 1958. This refers to a change of internal speedometer gearing related to revolutions per mile.
2.) There was no speedometer available for rear axle ratio 5.125:1 which was optional for the Twin Cam for competition use. That specification would be about 1725 Turns/Mile or 1075 Turns/Kilometer.
O.) Optional final drive for Competition use.
P.) Accurate for police use.
S.) Standard final drive ratio.
S2.) Standard final drive ratio for 1600-MK-II.
*. ) Some of the Turns Per Mile or Turns Per Kilometer numbers are calculated, not yet verified. If anyone can verify different numbers, please let me know.
|
