Vintage Minor Register

Technical Details


Production Seasons Chassis/Engine Changes Body Production Engine
Brake Cables Sundry Data Bibliography  


Production Seasons

Season Chassis Numbers
1929 MM101- M12738
1930 M12739 – M27097
1931 M27098 – M34699


Index of Chassis and Engine Changes

Chassis/Engine Change
MM101 September 1928, production commences. Tourer and fabric saloon
MM351 Roller bearing introduced on differential bevel pinion
MM1101 Improved carburetter fitted
MM1110 Less deeply dished steering wheel
MM1162 Stronger front dumbirons with longer pins to suit
M3099 Improved track rod ends (hexagon base)
M3102 Improved handbrake ratchet
M9249 Improved front brake cable pulleys (now shackled) cam levers, altered Kingpin and cable to suit.  Pulley still fitted under kingpin
U10126 Hyatt roller bearing introduced for fan.  Improved oil pump driven gear
March 1929 ‘M’ Type MG production commences
M12199 Modified petrol pipe assy.
U12326 Improved rear main bearing
M12557 Improved bonnet catch (chrome plated)
M12739 September 1929, coachbuilt saloon and 5 cwt. Van introduced.  Triplex windscreens fitted as standard
M14192 Smiths shock absorbers replaced by Armstrong type
M14456 Chrome plated brass replaces solid nickel radiator.  Double radiator stays introduced.  Bonnet platforms redesigned.  “MORRIS” radiator script deleted
M15136 Dynamo DEL 24 replaced by DDS5. (early dynamos DEL 7 and DEL 19 were superseded by DEL 24).  New concave cylinder block and nosepiece to suit
M15294 Revised mixture control geometry
M17883 New steering arm drag link end at steering box - adjustable with cap and lock screw
M27023 Semi-sports 2-seater and fire tender introduced
M27098 September 1930, Morris pattern running board rubbers replace pyramid pattern, except on vans.  Self-aligning door hinges introduced.  Window clamp lock replaces cam and lever on saloons.  Tourer hood and sidescreens redesigned
M29071 Stronger wheels introduced.  Wording changed on hubcaps from “MORRIS MINOR” to “MORRIS”
M29528 Transmission handbrake replaced by cross-shaft operated wheel brakes.  Front brake cables re-routed to brake lever forward of wheel hub with shackled pulley on top of kingpin.  More angled brake cam levers introduced.  Wider rimmed brake drums/backplates fitted
U30136 Stronger connecting rods fitted (stronger little end, gudgeon pin,  clamp bolt and improved tab washer)
M34699 Short wheelbase Minor production ends.  Long wheelbase family Eight saloon and Eight Special Coupe production commences with numerous specification changes

(In addition to the above changes, a number of unannounced changes were introduced by Morris to the Minor specification,
including the widening of the wing sideskirts, the flattening of the clutch driven plate and the modification to the steering box mount)

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Body Production

Season Body Colours and
Upholstery
Price
1929 Four-seater tourer Blue or brown cellulose with matching Rexine.  Black hood £ 125
£ 127   (w/Triplex)
Fabric saloon Blue or brown fabric with matching Rexine £ 135
£ 141/10/-  (w/Triplex)
Chassis Black enameled wings £ 100
1930 Four-seater tourer Blue cellulose with blue Karhyde. Black hood £ 130
Fabric saloon Blue fabric with blue Karhyde £ 140
Coachbuilt saloon Dark brown over brown two-tone cellulose with matching Karhyde £ 149
5-cwt. van Shop grey £ 135
Chassis Black enameled wings £ 105
1931 Four-seater tourer Blue cellulose with blue Karhyde. Black hood £ 130
Fabric saloon Blue fabric with blue Karhyde Black fabric with red Karhyde £ 135
Coachbuilt saloon Dark maroon cellulose with brown Karhyde.
Blue cellulose with brown Karhyde
£ 140
5-cwt. van Shop grey £ 125
Semi-sports Black fabric with maroon fabric tail and door caps and maroon Karhyde Drab hood £ 125
Fire tender Vermilion, lined with black and gold £ 170
Chassis Black enameled wings £ 100

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Engine

Bore: 57 mm (2.2435”)
Stroke: 83 mm (3.268”)
Bore/stroke ratio: 1.456:1
Capacity: 847.1 cc (51.68 cu. in.)
RAC Rating 8.056 hp
Bearing sizes:
Connecting rod: 1 ½” x 1 1/8” long
Crankshaft – rear: 1¾” x 1 3/16”
Crankshaft –front: 1 3/8” x 13/16”
Connecting rod centres: 165 mm (6½”)
Compression ratio: 4.75:1
Valve head diameter: 
Valve seat angle: 30°
Valve lift: 9/32”
Valve springs – free length: 1 ¾”
Valve springs – free coils: 7 ½
Valve spring rate: 71 lb. per in.
Valve stem diameter: 9/32”
Valve timing:
Inlet opens: 9° ATDC
Inlet closes: 35° ABDC
Exhaust opens: 43° BBDC
Exhaust closes: 7° ATDC
Cam follower clearances: Inlet and exhaust - 0.004” when hot
Firing order:  1,3,4,2
Piston working clearance: 0.003”
Ignition timing: With hand control fully retarded, points just opening at TDC 
Brake Horsepower:
At 1,000 rpm:  5.75 bhp
At 1,500 rpm:  9.00 bhp
At 2,000 rpm:  12.00 bhp
At 2,500 rpm:  15.00 bhp
At 3,000 rpm: 17.50 bhp
At 4,000rpm: 20.00 bhp
Dynamo: Driven at engine speed
Sump capacity: 4 pints 3 fl. oz.
Oil pressure (35 mph, hot) 45 – 50 psi
Starter ratio: 8.3:1
Sparking plugs: AC Sphinx B-II short reach, set to 20 – 25 thou
Fuel tank capacity:  5 gallons
Fuel consumption: 45 – 49 mpg
Radiator capacity:  10¾ pints
Capacity of block: 7¼ pints
Total cooling system capacity: 2 gals. 5 pts.
Engine weight (With clutch, less gearbox): 209 lb.

Cylinder bores are graded by 0.0005”, Z being greatest, Y normal, and X small.

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Transmission

Gearbox ratios:
First:  3.5:1
Second: 1.833:1
Top: 1:1
Reverse: 2.833:1
Rear axle ratio: 4.88:1 (9/44)
Crown wheel/bevel clearance: 0.005” – 0.006”
Engine/rear axle ratios:
First: 17.11:1
Second: 8.96:1
Top: 4.88:1
Reverse: 13.85:1
Gearbox oil capacity:  1 pint
Speedometer gear ratio: 4:17
Clutch toggle clearance: 3/32”
0.010”to 0.020” at pressure pins

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Chassis

Track: 3’ 6”
Wheelbase: 6’ 6”
Steering gear ratio: 7.7:1
Toe-in:  1/8"
Castor angle:
Turning circle:  34’ 6”
Wheels: 19” x 2.15”
Tyres:  4.00 x 19
Tyre pressure –front:  22 psi
Tyre pressure – rear: 26psi
Tyre pressure – rear - Semi-sports: 24 psi

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Electrical Equipment

Voltage: 6V
Instrument panel/switchgear:  Lucas
Dynamo: Lucas DEL7, DEL19, DEL 24, DDS5
Distributor: Lucas D4A, DS4, D41
Contact breaker gap: 0.012” – 0.015”
Starter motor:  Lucas RM35, 25SM, M35AO
Cut-out: Lucas CF1
Coil: Lucas P 24
Horn:  Lucas Sparton
Battery: 6V
Headlamps: Lucas R47B
Headlamp bulbs: B.A.S no.1S, 6V, 12W
Sidelamps: Lucas no.1120
Sidelamp bulbs: B.A.A no. 8S, 6V, 3W
Tail lamp: Lucas TF 201
Tail lamp bulb: B.A.A no. 8S, 6V, 3W
Festoon dashlamp: Lucas DF5
Festoon dashlamp bulb: B.A.S no. 8, 6V 3W
Ignition warning lamp: Screw type 8-9V 3W

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Bearing List

Front hubs – inner: LJ 25
Front hubs – outer: MJ 20
Rear hubs: LJ 40
Dynamo-commutator end: LJ ½
Dynamo – drive end:  LJ ¾
Clutch spigot: LJ 5/8
Clutch withdrawal: LJT 1½
Constant mesh pinion: LJ 35
Mainshaft: MJ 7/8
Bevel pinion: MJ 25
Differential: LJT 35
Bevel pinion roller: MRJ 25
Front main bearing MJ 1 3/8

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Brake Cables

Front – to chassis M9248: 47½”
Front – from chassis M9249 to M29527: 46½”
Front – from chassis M29528: 42½”
Rear: - All 48”

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Sundry Data

Speedometer cable length: 3’ 10½”
Wheel spokes:
Inner: 8g,. 6 15/32”
Outer, to M 29070: 8g., 8 7/32”
Outer, from M 29071: 8g., 8 1/8"
Battery to starter button cable: 3’ 4”
Starter button to starter cable:  1’9”
Battery to earth cable:  1’ 3½”
Battery to instrument panel cable: 7’ 1”
Starter ring gear: 83 teeth
Starter pinion gear: 10 teeth
Starter ratio: 8.3:1

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Bibliography

Date Publication Page Subject
08/06/28 The Autocar 1165 1929 Minor
07/28 The Morris Owner 570 Introducing the Minor
31/08/28 The Autocar 442-5 Advance Details of 1929 Cars
07/09/28 The Light Car & Cycle Car 404-7 1929 Minor
09/28 The Morris Owner 840-2 Minor saloon & Tourer Details
05/10/28 The Light Car & Cycle Car 5?0  1929 Minor
12/10/28 The Light Car & Cycle Car 578 1929 Minor (Motor Show)
30/11/28 The Autocar 1221-3 Minor saloon Road Test
04/01/29 The Light Car & Cycle Car 142-5 1929 Minor, Road Test & Description
08/29 The Morris Owner 726-30 Decarbonising the Minor
13/09/29 The Light Car & Cycle Car 450 Tuning & Modification
18/10/29 The Light Car & Cycle Car 596 Gordon England Types
06/12/29 The Light Car & Cycle Car 34 Jarvis Coupé
06/12/29 The Light Car & Cycle Car 38 Gordon England 2-Seater, Road Test
13/12/29 The Light Car & Cycle Car 62-3 Arrow 2-Seater
20/12/29 The Light Car & Cycle Car 95 Arrow 2-Seater, Road Test
03/01/30 The Light Car & Cycle Car 158 Gordon England Saloon
31/01/30 The Light Car & Cycle Car 262 CMS Sports 2-Seater
28/02/30 The Light Car & Cycle Car 365 Arrow 2-Seater
07/03/30 The Light Car & Cycle Car 405 Arrow 2-Seater
21/03/30 The Light Car & Cycle Car 464 Arrow Sports Model
21/03/30 The Light Car & Cycle Car 468-70 Minor Tuning & Maintenance
28/03/30 The Light Car & Cycle Car 493-5 Minor Tuning & Maintenance
04/04/30 The Autocar 651-3 Morris Minor, Detailed Information
11/04/30 The Light Car & Cycle Car 562-4 Tuning & Maintenance
11/04/30 The Autocar 689-91 Care & Maintenance
18/04/30 The Light Car & Cycle Car 590-2 Care & Maintenance
18/04/30 The Autocar 761-3 Care & Maintenance
25/04/30 The Autocar 819-20 Care & Maintenance
29/04/30 The Motor 608 Sunrayn Drop-Head Coupé
09/05/30 The Autocar 882-9 Special Coachwork
30/05/30 The Autocar 1079 CMS Sports 2-Seater
08/08/30 The Autocar 33 Semi-Sports 2-Seater – advertisement
08/08/30 The Light Car & Cycle Car 314 Semi-Sports 2-Seater
12/08/30 The Motor 52 Semi-Sports 2-Seater, Description
19/08/30 The Motor 93 Semi-Sports 2-Seater
05/09/30 The Light Car & Cycle Car 433 1931 Minor
10/10/30 The Light Car & Cycle Car 610 1931 Minor
17/10/30  The Light Car & Cycle Car 639 1931 Minor (Motor Show)
31/01/30 The Autocar 925-6 Semi-Sports 2-Seater, Road Test
07/11/30 The Light Car & Cycle Car 749 Arrow Spear
14/11/30 The Light Car & Cycle Car 780 Semi-Sports 2-Seater, Road Test
10/02/31 The Motor 43-5 Special Coachwork
21/08/31 The Autocar 316 Merlyn Drop-Head Coupé


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