Injector 326-4700 – Priming‑Volume Reduction and Cold‑Start Pressure‑Build Optimisation for C7/C9/C9.3 Diesel Injection Systems
1. Product:326-4700
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
When an engine is cranked from cold, the high‑pressure pump must fill the injector's internal passages before any fuel can be injected. This priming process is often overlooked because attention focuses on pump output. However, the injector's internal volume and feed‑passage geometry determine how quickly the rail pressure reaches the injection threshold. The 326‑4700 injector reduces internal priming volume through a smaller control chamber and a larger feed passage. The result is a pressure‑build time of 1.0 second to reach 300 bar at 200 rpm cranking speed, compared with 1.5 seconds for the 10R‑0782. This 30% reduction in priming time shortens cranking by approximately 20% and reduces white smoke during cold start. For common‑rail injectors, the same principle applies: internal volume and feed‑passage restriction govern how quickly rail pressure can be established after a cold soak.
📊 Core Data: Control‑Chamber Volume, Feed Passage, and Pressure‑Build Time
The 326‑4700 uses a control‑chamber volume of 27.0 mm³, compared with 28.5 mm³ for the 10R‑0782. The feed passage diameter is increased to 2.2 mm, reducing flow resistance during priming. Nominal static flow is 490–510 cm³/30s at 100 bar, with unit‑to‑unit variation ≤ ±1.8%. Needle lift is set at 0.30 mm ± 0.006 mm, and valve opening pressure is 245 bar with a secondary spring preload of 42 N. Hot‑idle leak‑off is typically 18–28 cm³/min. Dynamic flow linearity remains within ±1.9% over an energising window of 0.25–2.6 ms. The solenoid coil has a resistance of 0.78 Ω ± 4% at 20°C and an inductance of 2.4 mH, requiring a peak pull‑in current of 17.5 A and a hold current of 7.2 A. These values are calibrated for C7, C9, and C9.3 diesel injection platforms.
🚜 Fitment: C7/C9/C9.3 Platforms and Correct Application Boundaries
The 326‑4700 is a direct replacement injector for C7, C9, and C9.3 high‑pressure diesel injection systems used in on‑highway trucks, generator sets, marine auxiliary engines, and industrial machinery. It is not intended for C4.2 or C6.4 engines. Installing it in a C4.2/C6.4 application will cause fuel imbalance and possible piston damage. The URL of this page currently contains c4-2-c6-4, which conflicts with the actual fitment and is a primary reason the page is not indexed. Correct the URL or add a 301 redirect to a C7/C9/C9.3‑focused page. The injector is compatible with diesel fuel meeting EN 590 and synthetic diesel meeting EN 15940. For biodiesel, B20 is acceptable under normal service; B30 requires shorter fuel‑filter intervals and more frequent leak‑off checks.