[Bellerophon]

Geoff, I expect that you know, and I have put the information on here
before, but there are others that will not know.
The original pistons which are of a very light construction were forged (or
pressed for understanding) by a firm called Specialloyd which was part of the
Wellworthy Group who also made the Alfin brake drums used on the later cars.
This type of piston was developed during the war to produce a light strong
product which had a thin crown, and which has caused the downfall of quite a
few of our members due to detonation caused by a weak mixture and an advanced
ignition, and resulting in a collapsed crown.

As with a lot of our good companies Wellworthy no longer exist so one is
thrown back on the current suppliers, but a lot of their modern pistons are
thick and heavy but gives the possibility of modifying by removing some metal. An
example is by taking a high compression piston with a thick crown, and
machining to produce an almost flat top piston, so there is food for thought.

My regards,
Bellerophon