400-120-P DARTON SLEEVES Si Civic

Review DARTON SLEEVES Mid Wet 84mm 84.5mm 85mm for CIVIC SI

The Darton 400-120-P engine block is a high-performance aftermarket solution designed specifically for Honda Civic Si models equipped with the B16A2, B16A3, or B16A1 engines. This block is suitable for both 84mm and 85mm stroker applications, making it a versatile choice for enthusiasts seeking maximum power and durability from their engines.

This engine block is manufactured using Darton's proprietary Permanite process, which involves the use of high-silicon cast iron to create a stronger and more heat-resistant part. The block features a high-performance design with a large sump area to ensure adequate oil capacity and flow, even under high-load conditions.

The Darton 400-120-P engine block also includes several upgrades to improve strength and durability. These upgrades include thicker deck surfaces, increased wall thicknesses, and reinforced main and big-end bearing areas. The block's cylinder bores are also precision-machined to ensure a perfect fit for oversized pistons and rings, which can help improve combustion efficiency and power output.

Additionally, this engine block features a fully-machined surface finish, which provides a smooth and flat surface for easier engine assembly and improved cooling efficiency. The block also includes new water jackets and oil passages, which help to improve cooling performance and ensure optimal engine temperature.

The Darton 400-120-P engine block is also designed to work seamlessly with popular high-performance upgrades, such as aftermarket camshafts, pistons, and cylinder heads. Its robust design and precise manufacturing tolerances make it an ideal choice for those looking to build a high-performance Honda Civic Si engine that can withstand the demands of aggressive driving and competition use.

In summary, the Darton 400-120-P engine block is a high-performance aftermarket solution designed specifically for Honda Civic Si models equipped with the B16A2, B16A3, or B16A1 engines. Its high-silicon cast iron construction, thicker deck surfaces, and reinforced bearing areas make it stronger and more durable than stock blocks, while its large sump area, precision-machined cylinder bores, and improved cooling passages help to improve power output and cooling efficiency. Whether you're building a high-performance street engine or a competition-ready powerplant, the Darton 400-120-P engine block is an excellent choice.

The Darton 400 Series engine blocks are aftermarket performance blocks designed for Honda Civic SI models with B16A2, B16A3, and B16A1 engines. These blocks are available in 84mm, 84.5mm, and 85mm bore sizes. Here are some pros and cons of buying a Darton 400 Series block for your Honda Civic SI:

1. Enhanced Strength: Darton blocks are known for their increased strength due to their unique design. They use a nodular iron material which is stronger than the OEM cast iron blocks. This enhanced strength allows for increased power output and durability.

2. Improved Thermal Properties: Darton blocks have better thermal properties than OEM blocks. They have a better heat dissipation rate and can handle higher temperatures without warping or cracking.

3. Better Quality: Darton blocks are made with precision and care, ensuring a better fit and finish than OEM blocks. They also come with a warranty for added peace of mind.

4. Increased Power: With the added strength and improved thermal properties, a Darton block can handle more power than a stock block. This makes it an excellent choice for those looking to build a high-performance engine.

1. Cost: A Darton block is more expensive than a stock OEM block. The price difference can be significant, depending on the bore size and other factors.

2. Installation: Installing a Darton block requires some level of expertise and experience. It is not a DIY job for most people and will likely require the assistance of a professional mechanic.

3. Weight: A Darton block is heavier than a stock block, which can affect the overall weight and balance of the engine. This may not be a significant concern for most people, but it is worth considering.

A Darton 400 Series block is an excellent choice for those looking to build a high-performance Honda Civic SI engine. Its enhanced strength, improved thermal properties, and better quality make it a worthwhile investment for those who want to maximize the potential of their engine. However, the cost, installation complexity, and added weight are important considerations that should be taken into account before making a purchase.

If you are planning to build a high-performance Honda Civic SI engine and are looking for a strong and reliable block, then a Darton 400 Series block is an excellent choice. However, it is essential to weigh the pros and cons carefully and consider your budget, experience level, and specific goals before making a purchase. If you are unsure about the suitability of a Darton block for your specific application, it is always a good idea to consult with a professional mechanic or engine builder for advice.

Details:

The Darton pro-sleeve kit is available for many series of 4, 6, and 8 cylinder import domestic engines provides maximum bore Sizes boost potential. As shown in the photo, top flange has coolant passages and outside surface of sleeve contains fins that help reduce heat soak within sleeve, helping keep out your internals where it could cause damage cracking, warping, etc. There is a different engineering model for each engine and cylinder design. Darton mid sleeves are the best sleeves on market because of their strength and fitment.

Useful links. The enhanced water flow in and around the flange area is possible because of ported control engineering we call swirl coolant technology. Note: all Darton sleeves come from the factory slightly smaller than stock bore. Our mid design compensates for this high resident heat soak condition.

You can not install a piston into any Darton sleeve the way it arrives from factory. All Darton sleeves must be finish bored and honed to the specs of pistons going into them. Mid stands for modular integrated deck. In addition, Darton designs' manage and enhance water flow from block to head promote stability of cooling all sleeves are the wet design.

Their flanges tops against each other while still allowing coolant to flow through them. Now with Darton mid, swirl coolant technology the cooling medium is ported and directed to Significantly improve heat transfer where it needed most, in upper cylinder wall/flange area. In the normal dry sleeve installation cooling medium, water, must transfer heat absorption through block material and sleeves, which may be dissimilar metals. High rpm normally translates into efficient scavenging of air-flow but during misfires or incomplete flame propagation, high cylinder pressures and temperatures are created.

Inherent in open or closed deck engine blocks of cast iron aluminum is a certain amount water stagnation. Wet sleeves, Darton mid sleeves for honda Civic b16a engines replace your factory cylinder liners with high strength iron sleeves, eliminating a weak link in engine and providing you the needed to get full potential from setup without losing any sleep worrying about cracking sleeve taking out. In the case of blocks and heads, casting ports are designed for ease not efficient flow. The manufacturing process of cast in sleeves provides for economy scale low horsepower engines, but does not accommodate high horsepower, boost, or larger bore Sizes.

Darton mid wet sleeves Civic Si B16A2 B16A3 B16A1 84mm 84.5mm 85mm 400-120-P. All Darton sleeves come from the factory slightly smaller than stock bore. If you notice the Sides of top sleeves are notched so they mate up flush against each other, providing a full rigid structure when assembled, but still able to be replaced individually if needed. This is like pouring water through a funnel, there really no flow or velocity until the exits spigot.

These sleeves come bored to 84mm but can be over all the way 85mm.

specifications engineblocksam:

• for models: Si, Civic
• brand: Darton Sleeves
• mpn: 400-120-p
• part type: Sleeve
• engine codes: B16 B16a1 B16a2
• vehicle make: Acura Honda

general engineblocksam:

• category: Auto Parts > Car Truck Accessories > Engines > Blocks

seller engineblocksam:

• # reviews: 36847
• rating: 99.7%
• city: sanford, florida

offer engineblocksam:

• started: april 11, 2025
• prices: $750.99–$768.00
• item condition: New
• in stock #: 5
• options: ship-to-home
• sold #: 22
• availability: in stock
• best offers: true

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• paid by: seller
• policy: returns accepted
• time: 30 days

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• carrier: ups
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• type: calculated
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