CAT 292-3780 / 2645A718 Fuel Injector – High-Pressure Common-Rail Injector with Enhanced Flow Stability and Thermal Tolerance for C13/C15 Engines
1. Product:292-3780 / 2645A718
2. Compatible Equipment: Diesel Fuel Injection Systems
3. Manufacturer: Aftermarket OEM Replacement
4. Condition: Brand New, Fully Tested
5. Origin: ABOSEDE Diesel
6. Shipping period: 3-5 business days
7. Payment terms: T/T, Western Union, PayPal
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Product Introduction
The relationship between fuel temperature and injection quantity is one of the most overlooked variables in common-rail system diagnostics. Diesel fuel's viscosity drops by approximately 30% from 0°C to 80°C, altering the internal leak-through rate inside the injector's control chamber. This change in viscosity affects the pressure drop across the bleed orifice, which in turn shifts the opening delay and the delivered fuel quantity. The ECM attempts to compensate using its fuel temperature sensor, but the compensation is based on a nominal injector model that does not account for individual injector variations. The CAT 292-3780, also known as 2645A718, addresses this through a temperature-compensated bleed orifice that maintains a consistent flow coefficient across a wide temperature range. The result is a fuel delivery that remains within ±1.5% of the commanded value, regardless of fuel temperature, providing consistent combustion from cold start to full operating temperature.
Temperature Compensation – The Mechanical Solution to a Thermal Problem
The 292-3780's temperature compensation is achieved through a bimetallic element integrated into the bleed orifice assembly. This element, consisting of two metals with different coefficients of thermal expansion, adjusts the orifice area slightly as the temperature changes. At low temperatures, the orifice opens slightly to compensate for the higher viscosity, maintaining the same pressure drop. At high temperatures, the orifice closes slightly to prevent the pressure drop from becoming too rapid. The result is a bleed orifice that behaves as if it were temperature-independent, providing a consistent fuel delivery across the operating temperature range. The compensation is calibrated to maintain a flow coefficient variation of less than 1.5% from -20°C to 120°C.
Flow Calibration – The High-Flow Profile for C13/C15 Engines
The 292-3780 / 2645A718 is a high-flow injector with a static flow of 455–475 cc/30 sec at 100 bar. Its six-hole nozzle, with a hole diameter of 0.182 mm and a spray cone angle of 148°, is optimised for the C13 and C15 engines used in heavy-haul, mining, and on-highway applications. The needle lift is 0.062–0.066 mm, and the flow curve is linear up to 1.6 ms, supporting sustained high-load operation.
Electrical data:
Coil resistance (20°C): 0.54–0.62 Ω
Inductance (1 kHz, 1.5 A): 0.55 mH
Opening current threshold: 1.68 A
Holding current: 0.84–0.92 A (PWM at 1.2 kHz)