Is the Yunnei 156 horsepower the 4102 model?
3 Answers
Yunnei 156 horsepower is not the 4102 model, but the 4105. The 4102 engine is 120 horsepower, not 156 horsepower. Here is additional information: 1. The power of the engine is not equal to the power of the vehicle, as there are intermediate losses in mechanical transmission. Additionally, designs that increase the thickness and weight of the vehicle body for safety reasons can also lead to a loss in engine power. Therefore, a vehicle with a small-displacement engine is not necessarily slower or inferior in performance compared to one with a high-power engine. 2. Under the same displacement conditions, higher power is better. Some manufacturers use advanced technologies to increase power, such as intake valve stroke control, EGR, 5-valve systems, etc. While these technologies enhance power, they also mean an increase in engine costs.
Two years ago when I replaced the engine in my small truck, I researched this thoroughly. The Yunnei 156 horsepower engine is indeed part of the 4102 series. This model has a cylinder bore of exactly 102mm and is used in both China V and China VI compliant vehicles, with power output typically ranging between 140 to 160 horsepower. All three light trucks in our fleet carrying construction materials are equipped with this engine - it delivers noticeably more power than the older 4100 model, handles mountainous routes in Yunnan-Guizhou-Sichuan regions without overheating issues, though regular oil changes are crucial. To identify the exact variant of the 4102 series, you'd need to check the engine nameplate, but if the power rating matches, it's almost certainly the right one.
Having repaired diesel engines for 15 years, the Yunnei 156 horsepower models are basically from the YN27 series, which you refer to as the 4102 engines. The cylinder block design is mature and stable, and we see several of them every month at our repair shop. This power range is particularly suitable for 4.2-meter blue-plate light trucks, offering just the right economy for hauling five to six tons of cargo. However, it's important to note that the engine label might display codes like YN27CRE1, which are essentially different tuned versions based on the 4102 foundation. While the horsepower number is a reliable indicator, actual selection should also consider the torque curve, especially for vehicles operating in mountainous areas where low-speed performance is crucial.
