Product Description
MAHLE 929969315 MONOTHERM FORGED STEEL RACE PISTON SET for the 2004.5–2007 5.9L Cummins (24-valve common-rail). MAHLE’s one-piece Monotherm forged steel design delivers extreme durability and temperature stability for high cylinder pressures. Price is for a set of 6 pistons and includes rings, pins, and locks.
- Bore: 4.015"
- Stroke: 4.724"
- Rod length (O.D.): 7.559"
- Compression height: 2.804"
- Pin diameter: 1.575"
- Bowl volume: -48.6 cc
- Approx. compression ratio: 15.8:1
- Includes: pistons (x6), rings, pins, locks
- Valve reliefs: 0.075" pockets
Fitment
- 2004.5, 2005, 2006, 2007 Dodge Ram 2500 / 3500 with 5.9L Cummins (24V common-rail, 04.5–07 injector style)
Cross Reference / Notes
- MAHLE P/N: 929969315 (set), 929969315-1 (single piston)
- Included ring set: S42170 (per MAHLE Cummins PowerPak documentation)
- Typical market listing price: $3,247.06 (varies by retailer)
FAQ
Is the price for a full set?
Yes. This listing is for a set of 6 pistons and includes rings, pins, and locks.
Will these fit my 2004.5–2007 5.9L Cummins?
Yes—these are engineered for 04.5–07 24V common-rail trucks using the 04.5–07 injector/bowl style.
Do I need machining or special clearances?
Always verify piston-to-wall and ring end gaps per MAHLE specs. Performance builds may require additional clearance based on power level and fuel type.
What compression ratio will I see?
Listed at ~15.8:1 with a typical build (0.010" protrusion and 0.060" x 4.150" head gasket per MAHLE reference). Actual CR varies with deck, head gasket, and chamber volume.
Are these suitable for high-boost/race applications?
Yes—Monotherm forged steel construction is designed for extreme cylinder pressure and sustained heat in competition use.
