Key features

Automatic self-centring on engine block
Strong electromagnet ensures parallel seat surfaces
Suitable for installed and removed engine blocks
Portable and easy to operate
Wide range of cutting tools for 73–220 mm bore diameters
Supplied complete with tooling and wooden storage box

SKU MIRBB-86

MIRA BB-86 Counterbore Unit for recutting diesel sleeve counterbores

The BB-86 is a portable and easy-to-operate tool for recutting diesel sleeve counterbores in engine blocks. To ensure a proper seal between the engine block and wet liners, the counterbore seat must be refaced during engine overhaul or in the event of leaks. The unit centres automatically on the engine block and is secured by a strong electromagnet, ensuring that the refaced counterbore seats are automatically parallel to the sealing surface. The operation can be performed on installed or removed engine blocks, as well as on built-in underfloor engines. The BB-86 is available in three sizes based on inside magnet diameter: Mini (154 mm), Standard (170 mm), and Giant (198 mm), plus an Extension variant for depths up to 200 mm. Each unit is supplied complete with a turning handle, service tooling, instruction manual, and a wooden storage box. A wide range of MIRA cutting tools (MB85–MB139) covering bore diameters from 73 mm to 220 mm are available for use with the unit.

BB-86 Mini – inside magnet diameter: 154 mm
BB-86 Standard – inside magnet diameter: 170 mm
BB-86 Giant – inside magnet diameter: 198 mm
BB-86 Extension – max depth: Up to 200 mm
Clamping method: Electromagnet
Cutting tool MB85 – bore diameter: 73.00–86.00 mm
Cutting tool MB86 – bore diameter: 85.00–104.00 mm
Cutting tool MB87 – bore diameter: 97.00–126.00 mm
Cutting tool MB88 – bore diameter: 123.00–160.00 mm
Cutting tool MB88DAF – bore diameter: 123.00–158.00 mm
Cutting tool MB88AD – bore diameter: 130.00–166.00 mm
Cutting tool MB89 – bore diameter: 158.00–194.00 mm (requires intermediate steel plate)
Cutting tool MB136 – bore diameter: 105.00–130.00 mm
Cutting tool MB137 – bore diameter: 130.00–160.00 mm
Cutting tool MB138 – bore diameter: 160.00–190.00 mm
Cutting tool MB139 – bore diameter: 190.00–220.00 mm
Brand: Mira

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Accessories

SKU MIRVD-EVO

MIRA VD-EVO Vario Drive electronic drive unit for VGX-21 and BB-86

The VD-EVO Vario Drive is a variable electronic drive unit designed to increase efficiency at the cylinder head workstation during valve seat refacing. The unit enables fatigue-free and time-saving machining of valve seats and counterbores, ensuring a smooth and even cutting motion. The system is steplessly adjustable between 50 and 200 RPM and is compatible with all hand-driven MIRA valve seat units, including the VGX-21 and BB-86. Delivery includes: VD-EVO Stand-Alone unit, VD-EVO control box, power motor with flexible drive system, adapter unit with ON/OFF handle switch, and instruction manual in English or German.

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SKU MIRmira-formtools-and-pilots

MIRA Formtools and Pilots

MIRA offers a wide range of standard formtools in various shapes, with seat widths from 0.5–8.0 mm and seat angles of 45°, 30° and 20°. The tools are available in two qualities – "normal" and "X" for extremely hard valve seats – and with 4 different holder types. Custom special formtools can also be produced from customer drawings. The pilots ensure precise guidance in the valve guide and are available in various diameters. They are compatible with VG, VGX-21 and CENTRONIC machines. For smaller valve guide diameters, FDM Pilots and the sintered carbide version FDMH are available (FDMH only on request).

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SKU MIRBB-XJ/MT

MIRA BB-XJ and MT Series – Engine Refacing Tools Without Electrical Power

The BB-XJ and MT series are purpose-built tools for engine servicing that operate entirely without electrical power. They are portable and designed to withstand demanding service conditions. The range covers stationary engines, marine engines, railway engines and aero engines. Original OEM engine block specifications are required when ordering. Individual pricing available on request.

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VGX-21 Valve Seat Refacing Unit

The portable VGX-21 has been developed for specialised petrol and diesel cylinder head workshops. Accurate valve seat processing is achieved by means of a spherical spindle guide bearing and a hydraulic ball clamping system. Near-pressure-free centring and braceless fixing of the MIRA rotary head enables precise and concentric valve seats to be produced. The VGX-21 package includes the refacing unit itself, a DT1 toolhead for 21–45 mm diameters, 6 FD-type pilots, 6 SK-type formtools, an AV basic cylinder head support for wall mounting, service tooling, a manual crank handle, an instruction manual with formtool catalogue, and a wooden storage box. Optional accessories include alternative toolheads (DT05, DT2, DT3, DSD), an adjusting micrometer EM25–75, the VD-97 Vario Drive electronic drive unit, and the MUV-95 Multivac vacuum test unit.

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SKU MIRDRC

DRC Toolheads for VG-91 and Centronic

DRC toolheads are designed for use with the VG-91 valve seat refacing unit and Centronic. They enable processing of a wider range of valve seat diameters with the VG-91, at the same accuracy as the mounted DRC-01 in the VG-91 spindle guide. Spindles can be exchanged easily and precisely according to the VG-91 instruction manual.

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SKU MIRDSD

DSD Double Edged Toolhead

Double edged toolhead with exchangeable hard alloy carbide tips for turning valve seat rings and manufacturing ring seat counterbores with high accuracy. Suitable for heavy duty valve seat refacing. Available in various diameters and angles: DSD Ø55-75mm/5°, DSD Ø55-75mm/0°, DSD Ø45-55mm/5°, DSD Ø45-55mm/0°, DSD Ø35-45mm/5°, DSD Ø35-45mm/0°.

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SKU MIRDT

DT Toolheads for VGX-21

DT toolheads are intended for use with the MIRA VGX-21 valve seat refacing unit. Available in four sizes covering a wide range of valve seat diameters.

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SKU MIREM19-75

EM19-75 Micrometer with Gauge

The EM19-75 micrometer is designed for direct toolhead adjustment on the valve seat refacing unit. Enables precise and fast setting of the form tool when using DT and DRC toolheads. The included gauge allows verification of the micrometer's zero setting.

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SKU MIREM25-75

EM25-75 Micrometer with Gauge

The MIRA adjusting micrometer EM25-75 allows rapid adjustment of the selected toolhead to the exact desired overdimension for seat ring processing. The included gauge allows verification of the micrometer's zero setting.

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SKU MIRHMX-2000 EVO

HMX-2000 EVO – Universal Cylinder head Working Center

The HMX-2000 EVO is a complete and sturdy working center designed for professional engine rebuilders. Almost any type of cylinder head up to 120 kg in weight and 800 mm in length can be quickly secured using a universal quick-locking fixture. The machine is supplied in standard signal red (RAL 3001); other colours are available on request. Standard features include an 800 mm/300° rotating heavy-duty cylinder head support, integrated MIRA Vario-Drive electronic variable speed drive, MIRA Multivac vacuum test unit, HDT-25 steel table, and a storage table. The package includes the MIRA VGX-21 valve seat refacing unit with DR1 toolhead (21–45 mm), 6 pilots (FD-type), 6 SK-type formtools, 1 formtool setting gauge, AV rotating cylinder head fixture, and service tooling with instruction manual in English.

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SKU MIRMUV-EVO

MIRA MUV-EVO Multivac Universal Vacuum Test Unit

Portable vacuum test unit specifically designed for leak testing of valve seats before and after rebuilding. The unit is equipped with a diaphragm pump and a built-in pressure difference control for precise adjustment. In addition to valve seat testing, the unit supports a variety of vehicle-related vacuum tests and bleeding of hydraulic braking and clutch systems. Supplied with suction hose (2 m length), adapters with diameters Ø30, Ø40, Ø50, Ø60 and Ø80 mm, and an instruction manual in English or German.

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SKU MIRVGX-21

MIRA VGX-21 Aerokit for Lycoming and Continental Aero Engines

The MIRA AeroKit is specially designed for valve seat cutting and valve seat insert counterboring on blind cylinders of Continental and Lycoming aero engines. A special extension spindle allows cutting of all valve seats in the cylinder head up to 200 mm depth. Air-cooled cylinder heads of different depths and diameters can be processed with the VGX-Aerokit, which provides a fixed and precise clamping system. Use of the VD97 Vario Drive Unit is recommended for increased efficiency and precision. The kit includes the VGX-21 valve seat refacing unit, wall support with clamping system, extension spindle 200 mm, 6 SKX type standard formtools, 6 FD type standard pilots, wall mountings, fixed and loose bearing plates, leveling plate, clamping brackets with screws, service tooling and equipment, and instruction manual. Optional equipment available: DT2 and DT3 toolheads for various seat diameters, DSD double-edged toolheads, EM25-75 mm adjusting micrometer, extension spindles in other lengths, VD-97 Vario Drive Unit, wall adapter for VD97, and MUV-95 vacuum test unit.

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