- Location
- Durham, UK
They are the tool carriers that relied on air to lift the implements. The frame was the air tank. Is that right John?No mention of another DB peculiarity, the 2D
Possibly the only 2 cylinder engine in the world that actually had 3 pistons....
2 cylinder diesels are inherently inbalanced, and do tend to vibrate unless fitted with a huge, heavy flywheel and counterbalance weights on the crank
to save on weight, and size, DB decided to cast another bore into the sump, under the crankshaft. This was fitted with a cast iron piston which weighed exactly the same as the total weight of the 2 aluminuim pistons "up top"
The cast iron piston ran on an opposing stroke, so as the 2 pistons were going up, it was going down.
Rumour was, it did such a job at balancing the engine, you could balance a coin on the bonnet when the engine was running, such was its smoothness!!!