Cylinder Spacers & Adapter Rings

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Adapter rings for allowing smaller cylinders in cases bored larger. 

Primarily used when converting water boxer to air cooled.  As the case is wider than a type one, the cylinders will usually need to be shortened and can be cut to the water boxer size, on 94mm cylinders.  Only problem with this is that the area on the cylinders for the head studs is smaller and will not seal up with out lots of silicone sealer.  These adapter rings solve this problem and also allow the use of even smaller bores, if desired.

This picture shows two different sizes (85.5mm & 94mm), without cylinder stud notches cut yet:

Finished set for 94mm bore:

Precision CNC machined cylinder spacers, available in any size:


Flame cut spacers for comparison: