Lister 5/1 Diesel

Bolinder Semi-Diesel Hot Bulb Engines

Some Examples

Bolinder Hot-Bulb

The directly reversible Bolinder 'E' type engine.

Background/History

Bolinder started with oil engines in about 1894, manufacturing four-stroke engines, but the change was made to two-stroke operation early on, and thereafter was to be almost exclusively used by the company. The early model 'E' engines used water injection or drip at high powers, to prevent overheating of the bulb in the cylinder head.

By 1918, over 600,000 bhp had been sold in various engine types and configurations, making Bolinder one of the leading engine makers in Europe, although its location in Sweden restricted its export potential. The production sizes were: 5hp to 80hp in single cylinder, 10hp to 160hp in twins, and 80hp to 320hp in four-cylinder engines. This large range was later restricted to only up to 80hp in the twin cylinder versions, the larger fours being discontinued as the main market for Bolinder was in fishing vessels etc. Higher powers were catered for by the later ranges of 'M' engines.

Interestingly, the governor on the 'E' engine was the 'hit and miss' type, rather than continuous fuel flow control, the engines also being almost unique for a period for not having a reverse gearbox, the engine being directly reversible. Air starting was utilised for most of the Bolinder range of engines, a single or twin compressor being built into the engine for this purpose.

The later engines, designated the 'M' series were of improved design, with blower scavenging and water cooling of the cylinder heads to prevent overheating of the hot bulb at high powers. In normal use, the hot bulb was subjected to a wide range of temperatures, which caused a lot of thermal cracking and distortion. Water cooling made the range of temperatures narrower, with increased reliability.

The use of a blower (compressor) for scavenging was becoming quite widespread, and the Bolinder engine could run at reduced power with the blower out of action, which was useful for marine users who could otherwise have their ship become disabled far from land and repair facilities.

Sizes of typical engine: 500bhp engine weighed 40 tons, ran at 160 rpm, length including thrust block and clutch 27ft, flywheel diameter 4ft 7in diameter (1.40 metres) and the first boat to be fitted with this engine was the "Hjalmar Sorensen", length 165 ft breadth 33 ft draught 12 ft 9 ins deadweight cargo 750 tons, built in Denmark out of steel in 1915 and rigged as a four-masted schooner. The 'M' engine fitted to this vessel was a 240 bhp model and the ship made her first voyage to South America in May 1915.


Bolinder 'M' Hot-Bulb

Directly reversible Bolinder 'M' type engine 4-cylinder 320bhp

The side-mounted silencer is oval, not a picture error.

Bolinder 'M' Hot-Bulb

Bolinder 'M' Series Twin Cylinder Engine - Line Drawing

Bolinder Hot-Bulb Engine with Propellor Gear

Bolinder Engine With Propeller Reversing Gear

Bolinder 500hp Hot-Bulb Engine with Propellor Gear

Bolinder 500hp 'M' Engine With Propeller Reversing Gear

Bolinder Hot-Bulb Engine with Propellor Gear

Bolinder Engine With Propeller Reversing Gear


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