Motor power

Until 1972, the engine power was expressed in hk (horsepower). From 1972, kW (kilo-watt) was used. At that time the calculation base for hk was very different in the different countries. In America, the SAE-hk were common. By the use of unrealistic measuring methods, in which the motors ran on the test stand without auxiliary units, particularly high performance values could be specified.
While the Perkins engines were listed with DIN-hk in the Storebro price list, Volvo-Penta liked to use the SAE-hk.
With the change of the Swedish price list from no. 48 (1975) to no. 49 (1976) Storebro used the same unit for all engines. These now refer to the performance on the propeller shaft.
The new values made the popular Volvo Penta MD32 appear in a new light. The really much lower performance compared to the Perkins engines, in particular to the supposedly comparable Perkins 115, finally explained the large difference in the driving performance.

Another issue of performance was the difference between the flywheel performance and the propeller shaft power. With newer engines in the range of 300-400 hk, the loss is about 5 to 20 hp. This value depends on the type of gearbox installed.

Engine	Power SAE [hk]	Power DIN [hk]	Shaft power [hk]
Perkins 6.354M			115
Perkins T6.354MGT			175
Volvo Penta BB115	115		80
Chrysler LM318BW	225		185
Volvo Penta MD32	106		78
Volvo Penta TAMD70C		280	270
Volvo Penta TAMD63P		370	355
Volvo Penta D6 370		370	363