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Fine bore cylinder


Bushing collar & ring grooves made easily!

The advantages at a glance:
  • High-precision alignment through manual centering
  • Off-center drilling possible
  • Grooving of the bush collar and ring grooves is possible by manual operation
  • Very long travel distance for processing deep holes

Boring mill: Poleks

We use our precision hand drilling machine for special drilling work or the production of ring grooves on the flat surface around the cylinders.

It offers the advantage of approaching and aligning each cylinder by hand using a measuring device. By then drilling the damaged cylinders to oversize, we remove the abrasive wear caused by a piston tipper or piston seizure.

In conjunction with oversized pistons, after drilling and honing the engine block, we then receive piston clearance that is as good as new. If there is wear beyond the intended oversizes, it is possible to use a cylinder liner. For this purpose, the cylinder is drilled out further and fitted with a bush collar seat.

The cylinder liner is then cooled down using liquid nitrogen and shrunk into the preheated engine block. This creates an absolutely solid connection between the block and the socket. Finally, the bushing in the block is finely drilled and honed in order to obtain piston clearance that is as good as new.

In-line engine up to 8 cylinders

max. 150mm cylinder diameter

50€ / cylinder

V engine up to 12 cylinders

max. 150mm cylinder diameter

75€ / cylinder

Single cylinder

max. 150mm cylinder diameter

75€ / cylinder