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Ten/Twelve Series III 1938 - 9

Bhp graphs

The Series models went away from the chrome grille to a painted style in 1938. Thre was a change to the engine as both models had an overhead valve engine although the bore and stroke remained the same.

The picture shows a showroom at the launch of the series III Twelve.

Ten-Four and Twelve Series III
Engine
	Ten four	Twelve Series
Number of cylinders	4	4
Bore mm	63.5	69.5
Stroke mm	102	102
Capacity cc	1292	1548
Valves	overhead	overhead
RAC hp rating	10.0	11.98
CR
BHP (graphs)
at rpm
Valve timing
inlet opens	ATDC	ATDC
inlet closes	ABDC	ABDC
exhaust opens	BBDC	BBDC
exhaust closes	ATDC	ATDC
Coolant	water	water
Carburation	SU	SU

Dimensions
	Ten-four	Twelve
Wheelbase	8'4"	8'0"
Track		4'2"
Length		13'4"
Width		5'0"
Weight		21¾ cwt
Front suspension	half elliptic	half elliptic
Rear suspension	half elliptic	half elliptic
Axle ratio	5.375	5.25
Tyre size	550 x 16	550 x 16

Performance
0 to 50 mph secs	25	20.2
standing quarter secs	25.6
Fuel consumption mpg	30	30
Maximum speed	65	71

Body styles
	Doors	Ten-four	Twelve
Saloon sliding head	4	X	X
Saloon fixed head	4	X	X
Special Coupe	2	X

Chassis numbers
	Ten-four	Twelve
Start	S3/TN108711	S3/TW101
Finish	S3/TN122430	S3/TW19565
Total	13,719	19,464

Books and articles (available on the web)

Other sources
The Morris Owner	Issue	page
All Models Description of new Series III models	9/37	676
Twelve-Four model description	9/37	648-51
Popularity of the Twelve-Four	12/37	956-8
All Models Description of new Series III models	10/39	746
The Light Car and Cyclecar
Ten Saloon Road Test The Light Car	17/9/37
Twelve Twelve-Four description The Light Car	20/8/37	414-16
Twelve Road Test	3/2/39	356-8
The Autocar
Twelve-Four detailed description	20/8/37	335-6
The Motor Trader
Twelve Service Data Sheet 57	1/2/39	231-8
Twelve-Four detailed description	25/8/37	197-9
Practical Motorist
Ten-Four Road Test	11/6/38	236-7
Twelve Road Test	29/7/39	523-4
Twelve-Four detailed description	4/12/37	170-2
Twelve-Four detailed description	28/8/37	698

If anyone has copies of there articles please contact the webmaster so that they can be included on this site for reference.

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