Connecting rod transmits piston power to crankshaft, bearing huge alternating pressure during each combustion stroke. Cast connecting rod cannot sustain frequent heavy load acceleration for commercial vehicles, easily producing rod bending deformation under long distance transportation driving cycle.
Hot forged connecting rod integrated metal fiber bears instantaneous explosion pressure of turbo diesel engine without bending. Cast connecting rod internal loose structure generates permanent bending deformation under repeated heavy torque impact, changing piston vertical movement track and scratching cylinder wall surface.
Forged connecting rod big end hole machining precision keeps uniform clearance with matched connecting rod bearing alloy layer. Cast rod hole dimensional tolerance deviation creates local bearing overload abrasion, burning alloy layer within short driving mileage causing sudden engine oil pressure drop.
Naturally aspirated small displacement passenger vehicles adopt cast connecting rod for cost control, daily urban driving mild load meets service demand. Forged connecting rod extra material processing cost increases procurement expense unnecessarily for light load private vehicle overhaul orders.
Commercial diesel truck fleet prepare full forged connecting rod inventory, family gasoline cars stock standard cast connecting rod. Complete connecting rod assembly with matched bearing bush saves separate bearing purchasing step for repair shops.