Classic Norton Bikes: Polson pistons


SG– These with a longish reminiscence could recall that the 1930 DT engine in Dunedin is fitted with a Polson piston. An extra question has come up from Paul, who’s engaged on a well-worn late forties Inter, which belonged to his father. A few Polson  pistons had been with the bike and Ian has been an enormous assist – as ordinary – in figuring out them. He has additionally despatched scans of the 1955 Polson catalogue and the related web page with Norton pistons listed on it.  These scans are connected through this hyperlink and lots of because of Ian for offering them.

By the way, he tells me Polsons began buying and selling in 1927 – the title derived from the surnames of the founders, Herbert Pollard and Edward Nason.  Pollard died in 1936 however Nason carried on within the enterprise for a few years, ultimately changing into a part of Jack Brabham’s Repco organisation. After varied firm possession modifications, Polsons seem to have grow to be a part of ACL-Mahle – producers of the well-known Mahle piston vary.