Question: what is difference between volvo b9r and b11r?
Answer: Simply B9R means it has 9 litre engine and B11R means 11 littre engine. It is mounted at rear part side of the bus. Volvo B9R means it has a engine displacement of 9 litre volvo B11R means it has a displacement of 11 litre. more displacement means more stroke length, more stroke length means more torque.