Joined: Aug 2017 Posts: 682 Threads: 17
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Location: The far North East of England
Car type: 1934 Austin 7 AVH Van (in bits & incomplete!), 1936 Morris 8 Series I Tourer
Looking at a 1950's Hepolite catalogue, the (flat piston head) MG Midget / Magna / Magnette pistons 1928 to 1935 were 57mm standard bore, 66mm piston length and 36mm compression height. The 1936 8.9 hp 939cc Midget / PB pistons were 60mm standard bore, 69.25mm piston length and 36mm compression height.
Joined: Aug 2017 Posts: 25 Threads: 2
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I might be able to help with a set of new R4 58mm 3 ring solid skirt pistons. They were available with 16mm and 18mm gudgeon pins.
I pistons I have are 16mm pins. If this suits your R4 rods get back to me and I will give you more details.