Daimler Straight-Eight engines
| Twenty-Five 3¾-litres V 26 engine | |
|---|---|
| Overview | |
Cooling system | water, pump and fan, thermostatically controlled[4] |
| Output | |
| Power output | 90 bhp (67 kW; 91 PS)[3] @3,600 rpm (claimed) Tax rating 25.7 hp[4] |
| Chronology | |
| Predecessor | 3.7-litre Double-Six 30 |
| Successor | Thirty-Two V 4½ |
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Daimler Straight-Eight engines were
Three series of Straight-Eight engines were built between 1934 and the outbreak of the Second World War in 1939; another series, the DE36, was built after the war from 1946 to 1953.
Origin
The Straight-Eight engine was announced by
The general aim with the engine was "to give the greatest luxury in travel as expressed by quietness, smoothness, flexibility, and general ease and safety of control rather than great speed".[5]
While a great deal of useful experience had been acquired by Daimler from Lanchester, who were still building their overhead camshaft straight-eight when they were purchased in 1931, the Daimler Straight-Eight is not a copy.[6]
Twenty-Five V 26
_(cropped).jpg) In the Daimler Twenty-Five the straight-eight was mounted using their Daimler-patented bi-axial design by which flexible support is given to the engine at five points. The gearbox was also held with rubber at three points and one underneath.[5] The one-piece cylinder-head had the spark plugs sunk into it at an angle along the nearside. The make and break and the distributor were set almost vertically at the side of the block. Alongside was the coil with a spare mounted beside it. The generator on the offside shares a triple belt drive with the water pump and the radiator cooling fan.[5] |
The crankshaft was fully counterbalanced, mounted in nine main bearings, and fitted with a vibration damper. The valves, like other poppet valve Daimlers, had wide clearances, in some cases more than 0.060 inches (1.52 mm). They were overhead and driven by pushrods from a chain driven camshaft taking power from the rear end of the crankshaft.[3]
Increased engine size
In September 1935 it was announced that the cylinder bore was now increased to 80 mm increasing the engine's capacity from 3.746 to 4.624 litres following the 25% reduction in horsepower tax which took effect on 1 January 1935. intended to provide improved performance but more important lighter running for the engines and a consequent extension of silent and comfortable service. The tax horsepower rating is now 31.74.[7]
Thirty-Two V 4½
| Thirty-Two 4½-litre V 4½ engine | |
|---|---|
| Overview | |
Cooling system | water, thermostatically controlled[4] |
| Output | |
| Power output | Tax rating 31.74 hp[8] |
| Chronology | |
| Predecessor | Twenty-Five V 26 |
| Successor | Thirty-Six DE 36 |
In most respects, the Thirty-Two V 4½ was a bored out version of the V26, which it replaced. The compression ratio was increased to 6 to 1.[8] These engines were also fitted to a number of chassis made after 1936 which were fitted with a Lanchester radiator and nameplates.[10]
-
Tickford cabriolet 1936 -
-
limousine 1936
Sandringham royal livery -
Lanchester grilled
drophead coupé for
the Maharajah
Jam Sahib of Nawanagar
Light Straight-Eight E 3½ and E 4
| Twenty-Six 3½-litre E 3½ engine | |
|---|---|
| Overview | |
Twenty-Seven DE 27 | |
Introduced in 1936, the E 3½ was an entirely new engine to power a livelier car for the owner driver.[11] During 1935 a 3½-litre Straight-Eight open car achieved a maximum timed speed at Brooklands of slightly in excess of 90 mph.[12]
Increased engine size
In August 1938 the engine bore was increased to 77.47 mm (3.050 in) and the engine was renamed E 4.[13] The increase in bore increased the following:
- Cubic capacity to 3,960 cc (241.7 cu in)[14]
- Power output to 95 bhp (71 kW; 96 PS)[14] @3,600 rpm,[4] and
- Tax rating to 29.77 hp[4]
for the Lord Mayor of London
Thirty-Six DE 36
| Thirty-Six 5½-litre DE 36 engine | |
|---|---|
| Overview | |
Cooling system | water, thermostatically controlled[15] |
| Output | |
| Power output | 150 bhp (110 kW; 150 PS) @3,600 rpm,[15] Tax rating 35.92 hp |
| Chronology | |
| Predecessor | Thirty-Two V 4½ |
| Successor | Regina DF400 and DK400 |
The DE 36 was the last Daimler Straight-Eight.
State landaulette
allweather in royal livery
limousine, landaulette and allweather with perspex head
and their three backup cars
Notes
- ^ a b c New Eight-Cylinder Daimler.The Times, Tuesday, May 01, 1934; pg. 9; Issue 46742.
- ^ a b c Cars Of To-Day. The Times, Tuesday, May 29, 1934; pg. 19; Issue 46766
- ^ a b c d e f Smith 1972, p. 88.
- ^ a b c d e f g h Smith 1972, p. [page needed]
- ^ a b c d New Eight-Cylinder Daimler.The Times, Thursday, May 17, 1934; pg. 13; Issue 46756
- ^ Smith 1972, pp. 85–86.
- ^ a b c d e f g h i j Motor-Cars Of 1936. The Times, Saturday, Sep 28, 1935; pg. 6; Issue 47181
- ^ a b c d e f g h Smith 1972, p. 92.
- ^ Smith 1972, pp. 88, 92.
- ^ Smith 1972, p. 98.
- ^ Smith 1972, p. 100.
- ^ Smith 1972, p. 101.
- ^ Smith 1972, pp. 119–120.
- ^ a b Smith 1972, p. 120.
- ^ a b c d e f g h i j Road Test No. 15/47. The Motor, December 17, 1947
(reprinted in Smith 1972, p. 161) - ^ Douglas-Scott-Montagu & Burgess-Wise 1995, p. 249.
- ^ Sedgwick 1979, p. 249.
- ^ Culshaw & Horrobin 2013, p. 116.
References
- Culshaw, David; Horrobin, Peter (2013) [1974]. "Daimler". The Complete Catalogue of British Cars 1895 - 1975 (e-book ed.). Poundbury, Dorchester, UK: Veloce Publishing. pp. 109–118. ISBN 978-1-845845-83-4.
- ISBN 1-85260-494-8.
- ISBN 0713412712.
- Smith, Brian E. (1972). The Daimler Tradition. Isleworth, UK: Transport Bookman. ISBN 085184-014-0.
External links
