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The WD-9 is powered by International's D-335, 5.5 litre, 4-cylinder, overhead-valve engine offering approximately 50 hp.
The car initially came with a sidevalve engine but was later improved to an overhead-valve engine. Also the car, at that point, was quite an innovation with a fully enclosed monocoque chassis, which is why it is spacious inside.
It had the standard 26.5 hp, 4-cylinder, overhead-valve engine that drove the rear wheels through a 4:1 auxiliary gearbox.