Perhaps you are refering to the e3 engine Ehrlich designed and with Jack's help introduced to the Mayflower company.

<A HREF="http://news.bbc.co.uk/1/hi/sci/tech/1573288.stm">http://news.bbc.co.uk/1/hi/sci/tech/1573288.stm</A>

Brabham is a great promoter of new technology, being an engineer himself.

He is also involved with the 6 stroke Beare cylinder head is explained on his website and is applicable to motorcycles.

It might give the authorities a bit of a Head ache though.

<A HREF="http://www.jack-brabham-engines.com/">http://www.jack-brabham-engines.com/</A>

I would love to have heard that Barr & Stroud sleeve valve twin in the Brough.