Aero 350 pistons

[Tazmantic]

Hi all does anyone know the dimensions of the above pistons, if they are still available or an equivalent that can be used ? As I’m looking to possibly bore out some barrels.

Cheers

[Red]

Don't know whether this will help. Not easy to read but someone else may have a better copy

Roy

[Dads bike]

Evening
60.8mm bore x 60mm stroke is the std size.for the 1936 350cc Aero.
 Steve

[Tazmantic]

Cheers guys, anyone know an off the shelf piston I could get hold of these days that would fit? or with minimal machining.

Dads bike what book is that please?

Cheers

[Dads bike]

Evening
 Ref the 350cc Aero pistons, have you tried the Douglas club? They did source a large quantity of Hepolite “Douglas “ pistons when Hepolite ceased trading many years back. Maybe lucky.

As for the book, if you do go for one take care as there are many incorrect listings and statements, but does still have some good info.

Steve

[Tazmantic]

Cheers Dads bike, with reference to the pistons (and this is probably a stupid question) when it says "metal" what are the prefixes for? i presume Al is aluminium but what are the other 2??

[Dads bike]

Evening
There are no stupid questions !
Ref Hepolite pistons,
Al is aluminium
Ci is cast iron
H’lex is heplex which is a low expansion silicon alloy.
For a 1936 350cc Aero go for ref 5318 on the Hepolite catalog sheet.

Steve