Making JP Pistons

JP Pistons manufacture pistons entirely in-house. Ingots of aluminium are melted in the foundry and the molten material is poured into dies. Once the material has cooled the cast piston is removed from the die and placed into hot water. Once cooled the new piston is heat treated overnight and is ready for the first machining processes.

           

Once the runner is removed the piston has the base location face machined and the pin hole is bored.

First operation machining is completed on a CNC lathe.

Secondary operations, such as oil holes/slots, circlip grooves and valve reliefs, are done.

Pin holes are reamed and then the piston is placed into stock as an oversize.

This allows flexibility in product offer. When orders are received the oversize piston is machined on the cam turning lathe to the finished size.

Finished pistons are fitted with the gudgeon pin. Final checks are conducted and the piston is packed with rings and shipped.

JP Pistons helping preserve motoring heritage