Key features
- Spherical spindle guide bearing for precise machining
- Hydraulic ball clamping for near-pressure-free centring
- Produces precise, concentric valve seats
- Portable unit for cylinder head workshops
- Complete package with tooling and storage box
- Expandable with electronic drive and vacuum test unit
SKU KRAVGX-21
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.
- Valve stem diameter
- 4–16 mm
- Valve seat diameter
- 16–75 mm
- Seat ring counterbores
- 21–75 mm
- Included toolhead
- DT1 for 21–45 mm diameters
- Included pilots
- 6 pcs. FD type (standard selection)
- Included formtools
- 6 pcs. SK type (standard selection)
- Storage
- Wooden storage box
- Brand
- Mira
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Accessories
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.
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.
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.
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.
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°.
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.
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.
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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