Many light and small trucks perform well in urban delivery but reveal their weaknesses on the highway: sluggish acceleration, increased noise and vibration, rising oil temperatures, and accelerated wear on pistons and valves.

　　The reason is simple! Urban delivery mainly involves low-speed, frequent start-stop conditions, where engines need sufficient torque at low speeds. However, highway transport above 80 km/h demands higher standards for sustained power output, cooling efficiency, stability, and NVH (Noise, Vibration, and Harshness) performance. For transporters who prioritize timeliness and frequently run intercity routes, highway conditions are the true test of an engine's comprehensive capability.

　　Through interactions with users, Transporters Network found that many light and small truck users who frequently drive on highways prefer Quanchai Power. On one hand, Quanchai has long ranked among the top in the light commercial vehicle power matching market in China; on the other hand, its proven long-term stability and durability give highway transporters the confidence they need.

Q23A: An Upgraded "National Trend Power" for Highway Intercity Transport

　　Many 2.3L light truck diesel engines tend to lack "staying power" on highways. The Q23A, an upgrade from the Quanchai Q23 known as "National Trend Power," features targeted calibration for low-speed, high-torque performance in the most commonly used RPM range, concentrating power output where transporters need it most.

　　Master Liang, from Zibo, regularly travels between Shandong and Inner Mongolia, a 700-kilometer one-way trip with a high proportion of highway and mountainous roads. He drives an Ollin New Jieyun Qingchun Feiyang Edition equipped with the Quanchai Q23A engine, which delivers 143 horsepower and a maximum torque of 350 N·m between 1400 and 2400 rpm.

　　According to Master Liang, the truck accelerates smoothly on the highway, doesn't feel underpowered when overtaking at full load, and can steadily climb long mountain slopes. The engine noise is also well-controlled during extended driving. More importantly, the truck's highway fuel consumption is under 9 liters per 100 kilometers, demonstrating excellent fuel economy.

Q25A: More Composed for Highway Heavy-Load Transport

　　For higher-load scenarios such as highway heavy-load transport and mountain climbing, Quanchai offers the 2.5L Q25A series.

　　Transporter Master Lyu works in agricultural material transport as well as ceramic tile delivery, covering highway, national road, and rural road conditions. He drives a Forland Linghang S1 equipped with the Q25A engine, which produces 170 horsepower and a peak torque of 450 N·m, with 330 N·m of low-speed torque available at just 1000 rpm.

　　Master Lyu shared that the most noticeable improvement after switching trucks is the ample power reserve. When climbing long highway slopes or overtaking at full load, the power response is more direct and linear. At the same time, the truck's fuel consumption is stable at around 10 liters per 100 kilometers, significantly more economical than his previous vehicle.

　　Technologically, the Q25A employs a dual-swirl combustion system and high-pressure common rail technology, achieving a thermal efficiency of 43%. The cooling system has been optimized through simulation to maintain stable thermal management under high-speed, high-load conditions. The two-valve structure ensures reliability while also offering lower maintenance costs and better durability.

H25: A High-End Choice for Intercity Transport

　　Under prolonged high-speed cruising, many light truck engines experience noticeable vibration, increased noise, and even abnormal wear and oil burning due to sustained high loads. For high-end intercity logistics, Quanchai offers the "Zhiwei Power" H25.

　　Liu Shu, from Jining, Shandong, has been using Quanchai Power for 14 years. His fleet regularly travels between Shandong and Hefei, a one-way trip of nearly 900 kilometers, and currently has five vehicles equipped with the Quanchai H25 engine. Years ago, he drove a light truck with a Quanchai diesel engine into Tibet, and it didn't experience any oil ejection issues throughout the journey. The current H25 offers further upgrades in power, NVH performance, and comfort.

　　The H25 covers 160-190 horsepower, with a peak torque of 550 N·m. It uses a four-valve structure and a Bosch 1800bar high-pressure common rail system to deliver sustained, ample power. With a low-noise gear system and a dual-speed silicone oil fan design, idle noise is only 70 decibels, and the cabin remains quiet and comfortable during highway cruising.

　　In terms of durability, the H25 features a reinforced sealing structure and has a B10 life of over 800,000 kilometers, making it well-suited for long-term, high-load intercity transport scenarios.

F28T: A "Hardcore Core" for Long-Haul Heavy Loads

　　As the LNG refueling network gradually improves, the Quanchai F28T gas engine offers a more economical solution for intercity transport users.

　　Transporter Master Shen, from Yulin, previously drove a CNG small truck but found it lacked power reserve on highways. After switching to a Forland Linghang Dage equipped with the Quanchai F28T, he said he could finally "confidently run nationwide."

　　The F28T has a displacement of 2.8L, delivering 190 horsepower and a peak torque of 460 N·m. To address the high combustion temperatures of natural gas and the demands of heavy-load conditions, the F28T features a large-displacement turbocharger and reinforced valve design, improving wear and corrosion resistance by three times and achieving a thermal efficiency of 41.6%.

　　Master Shen reported that the current gas consumption cost per kilometer is about RMB 0.6, saving nearly RMB 0.5 compared to a diesel vehicle under the same conditions. Based on a daily mileage of 800 kilometers, this significantly boosts daily operational profits. The F28T strikes a better balance between power and cost.

Behind the Highway Performance: Quanchai's Overall Strength

　　Quanchai's excellent highway performance is supported not only by its product strength but also by its manufacturing system and service network.

　　On the manufacturing side, Quanchai relies on a 5G + Industrial Internet digital factory to minimize manufacturing tolerances. Every engine model must pass extreme cold, heat, high-altitude, and 160,000-kilometer full-environment validation before delivery, eliminating potential risks on the highway in advance.

　　On the service front, Quanchai has 1,716 service stations nationwide, with an average service radius of less than 52 kilometers. Combined with extended warranties on core components, this provides a stable operational guarantee system for transporters who frequently drive on highways.

　　From urban delivery to intercity transport, and from diesel to gas, Quanchai has built a diverse and precise power portfolio, delivering sustained, reliable, and efficient power output, and creating more stable operational profits for transporters.