Daimler Straight-Eight engines
Daimler Straight-Eight engines were eight-cylinder in-line petrol engines made by the Daimler Company to power the largest and most expensive cars in their range. The Straight-Eight engines replaced Daimler's earlier Double-Six V12 engines. Unlike the Double-Six engines, which used sleeve valves based on the Knight patents, the Straight-Eights used conventional poppet valves in the overhead valve configuration.
| Twenty-Five 3¾-litres V 26 engine | |
|---|---|
| Overview | |
| Manufacturer | The Daimler Company Limited |
| Production | early 1934 to September 1935 |
| Layout | |
| Configuration | 8-cylinder in-line |
| Displacement | 3,746 cc (228.6 cu in) |
| Cylinder bore | 72 mm (2.8 in) |
| Piston stroke | 115 mm (4.5 in) |
| Cylinder block material | aluminium alloy. 9-bearing crankshaft with vibration damper |
| Cylinder head material | one-piece detachable |
| Valvetrain | OHV worked by pushrods from a nine-bearing camshaft-in-block, timing is mounted at the back of the block |
| Compression ratio | 5.5:1 |
| Combustion | |
| Fuel system | Stromberg twin downdraught carburettor with cleaner and silencer, mixture thermostatically controlled (automatic choke). The induction system is split; four central cylinders are fed by one section, outer pairs by the other section. |
| Fuel type | petrol supplied by mechanical pump |
| Cooling system | water, pump and fan, thermostatically controlled |
| Output | |
| Power output | 90 bhp (67 kW; 91 PS) @3,600 rpm (claimed) Tax rating 25.7 hp |
| Chronology | |
| Predecessor | 3.7-litre Double-Six 30 |
| Successor | Thirty-Two V 4½ |
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.
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