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1950 ES2 pistons

Submitted by eugene_brolund on Wed, 06/05/2015
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Hi All,

a friend of mine who isnt internet savy asked me to get him a +60 piston for his 1950 ES2. I went to one of my favorite vendors & they list:

500cc: single- ES2, Model18

Is it even possible that one piston fits all years ES2? I wouldnt think so? Another favorite vendor lists the +60 piston as such:

ES2 500cc 1948-on

and another favorite vendor lists it as:

Piston for Norton ES2 1956-59

All 3 use a different part number, so I am wondering, if the same piston was used from '48 on, wouldnt that include '56-'59?

Anybody have any thoughs on this ?????

Skip Brolund

Submitted by paul_knapp on Fri, 08/05/2015

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I too have been wondering about the difference, because I see in the NOC shop, pistons advertised as pre '48 and post '48 for the 16H. I have an original Hepolite16Hpiston in my 1951 ES2 (modified skirt) that looks just like the pictures of the pre '48 Hepolite ones in the photographs.

I do know that the piston rings varied in radial diameter and thickness.

Paul

Submitted by dave_graham1 on Fri, 08/05/2015

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The pre 48 piston skirt is arced at the bottom to miss the flywheel, the post 48 piston is flat on the bottom. I don't know about the 56 - 59 pistons.

Andover Norton will sell you a post 48 piston, I've had to do this and have an arc machined in the skirt for a 46 engine.

 


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