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4089669 Cummins Piston Kit for ISB QSB 6BT Engines
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Cummins Engine Parts

4089669 Cummins Piston Kit for ISB QSB 6BT Engines

4089669 piston kit for Cummins 6BT, ISB and QSB engines.

SKU: 4089669
Description Additional information

4089669 is the piston kit fitted to Cummins 6BT, ISB and QSB engines. It is made from high-silicon cast aluminum alloy. Published figures include core dimensions Bore 102mm, Stroke 120mm, compression ratio 17.3:1.

Specifications

Part Number 4089669 (STD Piston Kit)
Compatible Engines & Fitment DCEC 4BT3.9, 6BT5.9, ISB5.9 QSB5.9; 2004.5–2007 Dodge Ram 2500/3500 5.9L
Core Dimensions Bore 102mm, Stroke 120mm
Compression Ratio 17.3:1
Material High-silicon cast aluminum alloy
Structure Design 3-ring design, 155° combustion chamber spray angle
Kit Contents Piston body, ring set, piston pin, circlips
Performance Rating Rated for 1600 bar fuel pressure; factory power 160–325 HP; max safe upgrade 350–400 HP
Key Features Hard anodized ring groove, graphite-coated skirt, strict weight tolerance ±5g
Application Scope Medium & heavy-duty scenarios; not for extreme racing use

Key Features

  • High-silicon cast aluminum alloy
  • Compatible Engines & Fitment: DCEC 4BT3.9, 6BT5.9, ISB5.9 QSB5.9; 2004.5–2007 Dodge Ram 2500/3500 5.9L
  • Core Dimensions: Bore 102mm, Stroke 120mm
  • Compression Ratio: 17.3:1
  • Material: High-silicon cast aluminum alloy
  • Structure Design: 3-ring design, 155° combustion chamber spray angle

Typical Applications

  • Medium & heavy-duty scenarios
  • not for extreme racing use

Ordering from Sino Bus Parts

  • Wholesale pricing; bulk orders welcome
  • Global shipping
  • Fitment confirmed against your engine serial or CPL before dispatch
  • Contact us on WhatsApp for a quotation
Part Number

4089669
Fitment

Cummins 6BT ISB QSB Series
Product Type

Piston Kit
Quality Standard

Genuine Cummins Quality
MOQ

Bulk Orders Accepted
Lead Time

3-15 Days Global Shipping

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