Area of application
Agricultural tractor for two-furrow plough. Because the tractors were starting to be fitted with rubber tires, road transportation with tractors became increasingly normal.
At the start of the second World War, a fuel stop was introduced to the private market and for those who wanted to continue driving their tractors, wood gas unit became a solution.
A few hundred BM 2:s were made during the war years under the name Munktells GBM 2.
To be able to drive on wood gas, you had to rebuild the engines with new cylinder caps with sparkplugs and magneto. The pulley was moved to the right side to give space for the wood gas container.
The gearbox’s gearing changed depending on if the tractor had iron- or rubber tires.
Hesselmans wood gas unit was also available for the tractors made previously that were still in use on farms.
When the war eventually ended you could rebuild the industrially made wood gas driven tractors with a conversion kit for compatibility with the conventional fuel.
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Munktells GBM 2
Engine Bolinders W5, 2-cyl, 2-stroke hot bulb engine rebuilt for wood gas drift
Cylinder bore 150 mm
Stroke 150 mm
Engine output, normal 32 hp vid 1 100 r/min
Birch wood, humidity 10% 28,8 hp (on the pulley)
Birch wood, humidity 20% 25,1 hp (on the pulley)
Fir wood, humidity 16% 26,8 hp (on the pulley)
Birch wood, humidity 10% + methanol 33,9 hp (on the pulley)
Compression ratio 8,2:1
Wood gas unit Hesselman T-500
Wood container, volume 1,5 hl
Speed with rubber wheel,
forward gear 1 to 4 3,1 - 4,5 - 6,9 - 14,3 km/h
Speed with iron wheel,
forward gear 1 to 4 2,8 - 4,0 - 4,8 - 6,0 km/h
Fuel tank 75 L
Cooling system 25 L
Weight, complete with wood gas unit,
filled up wood container and iron wheel 2 400 kg