Dongfeng KR truck parts turbocharger Air intake hose 1109021-K90A1

Designed to optimize air delivery to the turbocharger, the hose features a smooth inner wall (Ra ≤ 0.8μm surface roughness) that minimizes airflow turbulence—critical for maintaining consistent boost pressure. Its gradual 3° bend angle (matching the engine bay’s layout) avoids sharp turns that disrupt airflow, ensuring a steady supply of compressed air to the engine. The integrated bellows section (with 8 convolutions) provides 15mm of axial flexibility and 10° of angular movement, accommodating engine vibration and thermal expansion without kinking. In performance testing, this airflow-optimized design preserves 98% of the turbocharger’s rated airflow, supporting the engine’s maximum power output (e.g., 350hp for Dongfeng KR’s diesel engine) and reducing fuel consumption by 2–3% compared to restrictive hoses

Crafted from a high-performance EPDM (Ethylene Propylene Diene Monomer) rubber compound with 15% fabric reinforcement, the hose withstands the extreme conditions of the engine bay. It tolerates continuous operating temperatures from -40°C (cold starts) to 150°C (turbocharger heat soak) and intermittent peaks up to 180°C without hardening or cracking. The rubber compound also resists internal pressure up to 100kPa (1.0 bar)—well above the turbocharger’s typical boost pressure of 60–80kPa—preventing ballooning or burst failures. Unlike low-grade SBR rubber hoses that degrade within 6 months, this EPDM construction maintains elasticity and structural integrity for 3+ years, even when exposed to engine oil, coolant, and road chemicals

Engineered to prevent air leaks (which reduce turbocharger efficiency and engine power), the hose features a multi-layer sealing system. The flanges at both ends are reinforced with 1.5mm-thick steel rings (embedded in the rubber) that maintain shape under pressure, ensuring a tight seal against the turbocharger and air filter ports. The inner flange surface is textured with a 0.5mm rib pattern that enhances grip on mating surfaces, while the included stainless steel T-bolt clamps (with 8mm bolts) apply uniform pressure across the flange—eliminating gaps that cause air leaks. A pressure decay test (100kPa initial pressure, 30-minute hold) shows less than 2kPa pressure loss, meeting Dongfeng’s strict airtightness standards. Unlike hoses with weak flanges that deform under clamping force, this design ensures long-term airtight performance

Built to withstand the rigors of daily truck operation—constant vibration, UV radiation, and environmental exposure—the hose integrates anti-aging and vibration-damping features. The EPDM rubber is infused with UV stabilizers and antioxidants that resist degradation from sunlight and ozone, passing 1,000 hours of xenon arc testing (simulating 5 years of outdoor exposure) without cracking or brittleness. The fabric reinforcement layer (polyester cord) absorbs engine vibration, reducing stress on the rubber and preventing fatigue failures at the bellows-to-flange joints. Additionally, the hose’s outer surface is coated with a smooth rubber layer that resists abrasion from contact with engine bay components, maintaining structural integrity even after repeated rubbing. Each unit undergoes pressure cycling testing (0–100kPa, 10,000 cycles), temperature cycling (-40°C to 150°C, 500 cycles), and leak testing, backed by a 18-month warranty against defects (e.g., cracking, ballooning, flange failure)