DSS Racing Forged Pistons with Custom Rings for 4.0L Jeep Engines

This item is an upgrade for our 4.0L Jeep Engines.

Forged and machined with premium aircraft-quality 4032 alloy, the pistons are a great choice for naturally aspirated, nitrous or boosted engines with the added strength from the internal gussets. Additional CNC milling removes material in non-critical areas to achieve a lighter weight for the perfect balance of strength, power, and longevity.

The patented X grove extends the life of the cylinders, pistons, and rings. On the down stroke debris and excess oil are swept into the X grove and exit the piston's oil drain back holes. This keeps the clearance between the piston and the cylinder wall cleaner and reduces oil load on the oil ring. On the up stroke when fuel washes down normal wear and break-in debris are swept into the X grove but exit into the oil pan and this maintains an oil film on the most critical parts of the skirts and cylinder walls. The pistons include custom rings. For optimized ring seal at the upper RPM ranges horizontal gas ports were added.

Engine Brand: Jeep

Engine Family: AMC/Jeep 6 Cyl.

Engine Size: 4.0

With/Without Rings: Includes Rings

Ring Width: 1.5/1.5/4MM

Compression Height: 1.592

Pin Diameter: 0.931

Connecting Rod Length: 6.125

Crankshaft Stroke: 3.440

Piston Series: 1 - FX 4032 Alloy

Alloy: 4032 Alloy

Cylinder Head: Jeep

TDC Assembly Height: 9.437

Piston Top Aprox. Comp. Ratio: