What are the differences between Yuchai 4105 and 4108?
2 Answers
The differences between Yuchai 4105 and 4108: 1. Different bore diameters: The bore diameter is the diameter of the cylinder, and the stroke is the distance between the top dead center and bottom dead center of the piston movement. The bore diameter of the 4108 is 108 millimeters, while that of the 4105 is 105 millimeters. 2. Different sounds: The sounds emitted by the 4108 and 4105 diesel engines are different. The 4108 diesel engine produces a muffled sound when going uphill, while the 4105 diesel engine does not. Characteristics of diesel engines: 1. Fuel injection timing and fuel metering are completely separated, with injection pressure and process controlled in real time by the ECU. 2. The injection pressure, timing, and duration for each cylinder can be adjusted according to the engine's operating conditions to achieve the optimal control point for fuel injection. 3. Capable of achieving very high injection pressure and enabling pre-injection of diesel fuel.
As a seasoned trucker who frequents truck forums, I've driven many vehicles equipped with Yuchai 4105 and 4108 engines. The differences between these two engines are quite noticeable. The 4105 has a 105mm bore, with a displacement of approximately 4.1 liters and an output of around 110 horsepower, making it suitable for light-duty trucks and urban/rural transportation. The 4108 has a slightly larger bore of 108mm, with displacement exceeding 4.2 liters and power reaching up to 140 horsepower, delivering stronger performance, especially noticeable when climbing hills. The biggest difference lies in power delivery: the 4108 offers better stability at high speeds or when hauling heavy loads, though it consumes slightly more fuel—about 0.5 liters extra per 100 kilometers. From a design perspective, the 4108 features an optimized cooling system that reduces overheating issues, while the 4105 has a simpler structure, making maintenance cheaper. My recommendation is: if you're doing heavy-duty work or long-haul trips, go for the 4108 for peace of mind; for regular light loads, the 4105 is economical and sufficient.
