Darton Dry Cylinder Sleeve Set for BMW / Toyota B58

Strengthen your BMW / Toyota B58 engine block with a Darton Dry Cylinder Sleeve Set. These sleeves are designed to replace the factory cylinder liners with a stronger, more durable ductile iron cylinder surface, making them ideal for built engines, high-boost setups, and higher-power applications.

Factory aluminum blocks can become limited when exposed to excessive cylinder pressure, aggressive boring, or high-boost conditions. Darton Dry Sleeves help solve this issue by providing a stronger cylinder wall surface that can support more demanding engine builds.

Features

• Complete set of 6 Darton dry cylinder sleeves
• Designed for BMW / Toyota B58 engines
• Strong ductile iron sleeve construction
• Replaces the factory cylinder liners
• Supports increased cylinder strength for high-power builds
• Allows the block to be bored further than stock
• Designed for dry sleeve installation
• 82mm to 83mm max bore range
• Ideal for forged piston and built motor applications

Fitment

• BMW B58 engines
• Toyota GR Supra MKV / A90 / A91 3.0L B58 engines

What Are Dry Sleeves?

Dry sleeves are called “dry” because the sleeve body is not directly exposed to coolant inside the block. They are installed into the block with an interference fit, creating a strong and stable cylinder surface without coolant surrounding the sleeve body.

Important Install Notes

All Darton sleeves come from the factory slightly smaller than the stock bore. These sleeves must be professionally installed, finish bored, and honed to match the exact specifications of the pistons being used.

Darton recommends that aluminum block cylinder walls be lightly honed with Brush Research bumble hones before sleeve installation. Proper surface preparation on both the block and sleeve helps improve sleeve fitment and heat transfer.

Professional machine work is required. These sleeves are not a drop-in part and should only be installed by an experienced machine shop or engine builder familiar with aluminum BMW B58 blocks.

Recommended For

• Built B58 engines
• Forged piston builds
• High-boost turbo setups
• Oversized bore applications
• Drag racing builds
• High-horsepower street cars
• Engine builders looking to reinforce the B58 block