News & Trade Shows

Connecting rods are essential components in diesel engines, transferring the force from pistons to the crankshaft to generate mechanical power. The strength and design of a connecting rod directly affect engine performance, efficiency, and reliability, especially in heavy-duty or high-stress applications. Most forged steel connecting rods used in diesel engines have a tensile strength of 900–1100 MPa, giving them the durability to withstand extreme loads and repeated stress cycles. Choosing the right rod, whether stock, forged, or billet, can make a significant difference in engine longevity and performance. In this guide, we will break down the differences between these types of...

The crankshaft is the mechanical core of any diesel engine, transforming the piston’s linear combustion force into rotational torque that ultimately drives the vehicle. Its stroke length, journal configuration, and balance determine how efficiently power is delivered, how smoothly the engine operates, and how well it withstands long-term mechanical stress. A properly engineered crankshaft directly impacts torque characteristics, vibration control, and overall engine durability. One measurable benefit of proper crankshaft design and balance is vibration reduction. In controlled engine studies, using balance components reduced measured vibration levels by over 40% at 750 rpm and by about 21 % under typical load conditions,...

Main bearings and rod bearings are critical hydrodynamic components that support the crankshaft and connecting rods inside a diesel engine. Though not visible during operation, they function under extreme combustion pressures and depend entirely on a stable hydrodynamic oil film to prevent metal-to-metal contact. Hydrodynamic journal bearing oil films typically operate within a 1–10 micron range, where even minor clearance variations can significantly influence peak pressure distribution and wear behavior. In high-compression diesel engines, where cyclic loading is severe, maintaining correct bearing clearance, oil viscosity, and lubrication stability is essential for durability. Understanding the functional differences between main and rod...

The engine block is the structural backbone of a diesel engine, housing the cylinders, maintaining bore geometry, and resisting extreme mechanical and thermal loads during combustion. During a rebuild, the decision to overbore, sleeve, or replace the block directly determines compression stability, thermal control, and structural durability under sustained load. A 2025 failure analysis by He et al. on a diesel engine aluminum cylinder head demonstrated that fatigue cracking can initiate from casting defects, residual stress, and stress concentration under combined thermal and mechanical loading. The findings reinforce a broader engineering principle applicable to engine blocks: casting quality, residual stress,...

Piston rings operate at the critical sealing boundary between combustion pressure and cylinder wall stability. Beyond sealing, they regulate oil film thickness, transfer heat from the piston crown, and maintain compression integrity under sustained thermal and mechanical loading. Within this system, piston ring end gap functions as a calculated thermal expansion allowance that directly influences pressure retention and oil control. In high-compression diesel engines, even small deviations in ring clearance affect blow-by rate, lubrication stability, and long-term cylinder wear. Because diesel combustion generates elevated cylinder pressures, dimensional precision becomes increasingly critical. Research published in the Transactions of Beijing Institute of...