Modular Integrated Deck (MID) Engine Sleeves

The Darton 300-035 engine sleeves offer a robust solution for enhancing the performance and durability of aluminum engine blocks that may have design weaknesses in their upper deck areas. Traditional 'cast-in sleeves' are often an economical choice for low-horsepower engines but are unsuitable for high-horsepower, high-boost, or larger bore applications. Darton's patented Modular Integrated Deck (MID) system provides a superior alternative, utilizing uniquely designed cylinder sleeves that interlock to form a reinforced, tensioned deck. This design not only strengthens the block but also allows for the individual replacement of sleeves. These sleeves are designed as 'wet sleeves' and incorporate 'Swirl Coolant Technology' to manage and enhance water flow between the block and head, promoting stable cooling. Additionally, 'Register Fins' help dissipate heat, preventing excessive combustion chamber temperatures that can lead to detonation and engine failure. The sleeves are treated with a phosphate coating for superior corrosion and rust resistance, which also adds a protective barrier for the lower o-rings, extending their lifespan. Darton sleeves are constructed from bulletproof ductile iron with a 130,000-psi tensile strength, offering cast iron performance within an aluminum block. Key benefits include improved block integral strength, enhanced cooling, superior oil and compression control, and increased horsepower output potential. They are suitable for both street and strip applications and provide superior cylinder sealing and ring wear. Product details for this specific sleeve include a bore of 3.37 inches, an OD of 3.751 inches, a wall thickness of 0.148 inches, a length of 5.335 inches, a thickness of 0.2 inches, and a diameter of 3.92 inches. The fitment is specifically for the Nissan SR20 engine from 1991 to 1995.