Few reserves, no constant power and high fuel consumption – the Valmet 8100 engine did not do well in a comparative test carried out in 1994. Valmet (now under the Sisu label) has quickly responded to this feedback and has come up with the recently introduced 8150 model. In this report we find out how the new 92kW/125hp engine performed in the field and on the test bench. Text by Manfred Neunaber, photos by Stefan Tovornik