Jaguar Mark IV

SS Jaguar Jaguar 1½—2½—3½ Litre
Jaguar 2½ litre sports saloon 1947
Overview
Manufacturer	SS Cars Jaguar Cars
Production	1935–1949
Assembly	Coventry, England
Body and chassis
Class	Executive car (E)
Layout	FR layout
Chronology
Predecessor	SS Cars Ltd SS1
Successor	Jaguar Mark V

SS Jaguar 1½ Litre Jaguar 1½ Litre
SS Jaguar sports saloon 1937
Overview
Production	1935–1949 10,980 made
Body and chassis
Body style	4-door saloon 2-door drophead coupé
Powertrain
Engine	1,608 cc (1.6 l) I4 1,776 cc (1.8 l) I4 Standard
Transmission	4-speed manual
Dimensions
Wheelbase	112.5 in (2,860 mm)
Length	173 in (4,390 mm)
Width	65.5 in (1,660 mm)
Height	60 in (1,520 mm)

SS Jaguar 2½ Litre Jaguar 2½ Litre
SS Jaguar sports saloon 1936
Overview
Production	1935–1948 6281 made
Body and chassis
Body style	4-door saloon 2-door drophead coupé
Powertrain
Engine	2,664 cc (2.7 l) I6
Dimensions
Wheelbase	1935–1937: 119 in (3,020 mm) 1938–1948: 120 in (3,050 mm)
Length	186 in (4,720 mm)
Width	66 in (1,680 mm)

SS Jaguar 3½ Litre Jaguar 3½ Litre
Jaguar sports saloon 1947
Overview
Production	1937–1948 3162 made
Body and chassis
Body style	4-door saloon 2-door drophead coupé
Powertrain
Engine	3,485 cc (3.5 l) I6
Dimensions
Wheelbase	120 in (3,050 mm)
Length	186 in (4,720 mm)
Width	66 in (1,680 mm)

The Jaguar Mark IV (pronounced mark four) is a range of automobiles built by Jaguar Cars from 1945 to 1949. The cars were marketed as the Jaguar 1½ litre, Jaguar 2½ litre and Jaguar 3½ litre with the Mark IV name later applied in retrospect to separate this model from the succeeding Mark V range.

The range was a return to production of the SS Jaguar 1½ litre, 2½ litre and 3½ litre models produced by SS Cars from 1935 to 1940. Before World War II the model name Jaguar was given to all cars in the range built by SS Cars Ltd with the saloons titled SS Jaguar 1½ litre, 2½ litre or 3½ litre and the two-seater sports cars the SS Jaguar 100 2½ litre or 3½ litre. In March 1945 the company name SS Cars Ltd was changed to Jaguar Cars Ltd.

All the Mark IVs were built on a separate chassis frame with suspension by semi-elliptic leaf springs on rigid axles front and rear.

The smallest model of the range originally featured a 1608 cc side valve Standard engine but from 1938 this was replaced by a 1776 cc overhead-valve unit still from Standard who also supplied the four-speed manual transmission.

Pre-war the car was available as a saloon or drophead coupé but post war only the closed model was made. Up to 1938 body construction on all the models was by the traditional steel on wood method but in that year it changed to all steel. Performance was not a strong point but 70 mph (113 km/h) was possible: the car featured the same cabin dimensions and well-appointed interior as its longer-engined brothers.

Despite its lack of out-and-out performance, a report of the time, comparing the 4-cylinder 1½-litre with its 6-cylinder siblings, opined that the smallest-engined version of the car was "as is often the case ... the sweetest running car" with a "big car cruising gait in the sixties".

Mechanically operated brakes using a Girling system were fitted.

Again the engine was sourced from Standard but had the cylinder head reworked by SS to give 105 bhp. Unlike the 1½ Litre there were some drophead models made post-war.

The chassis was originally of 119 in (3,020 mm) but grew by an inch (25 mm) in 1938 to 120 in (3,050 mm). The extra length over the 1½ Litre was used for the six-cylinder engine and the passenger accommodation was the same size.