This complete set of four +0.060in high-compression pistons is made for Austin Healey 100 BN1 and BN2 engines being rebuilt to the 8.6:1 piston specification of this 100M replacement range. Supplied with piston rings, gudgeon pins and circlips, it is intended for cylinders machined to suit +0.060in oversize pistons.
This version provides the high-compression piston specification for an Austin Healey 100 engine that has been assessed as suitable for rebuilding at +0.060in oversize. It allows the higher-compression engine specification to be retained while using pistons sized for the newly machined cylinders.
The complete set covers all four cylinders and includes the associated rings, gudgeon pins and circlips.
The +0.060in designation refers to the piston diameter relative to standard size. The cylinder block should be assessed before machining to confirm that it is suitable for this finished bore size. Final machining should then be carried out to suit the actual replacement pistons and the required piston-to-bore clearance.
Check the existing bore dimensions and condition of the block before ordering. Select +0.060in only where the engine machinist has confirmed that this oversize is appropriate for the individual block.
A piston ring compressor is available separately to hold the piston rings in their grooves while the piston is installed into the cylinder bore.
8.6:1 HIGH COMPRESSION
