without rings
Pin = 17x58
Ring 1 = 1.5mm
Ring 2 = 1.5mm
Ring 3 = 2.8mm
Compression ratio = 9.5:1
not the same with compression ratio 10.3:1
Pin = 17x58
Ring 1 = 1.5mm
Ring 2 = 1.5mm
Ring 3 = 2.8mm
Compression ratio = 9.5:1
not the same with compression ratio 10.3:1