Originally Posted by
katinas
WilDun, there has been a lot of talk about Ryger ........................
for me really interesting again if new intake configuration could help to rise low torque at mid range.
.................................................. .......
In general, due to the con rod small end width / strength, it is very difficult to construct a narrow bottom part of the piston with a diameter of less than 35 mm. .................................................. ..........
In other words, more cc, more space for small end and pin. And the area ratio between the upper and lower parts of the piston could be progressively increased while maintaining the required con rod small end strength for bigger piston engines.
Stepped piston lower part take away some working cc from upper piston. In my case with upper 57mm and lower 38mm, stroke 50.6mm, pumping capacity lowered from 129cc to 71,7cc, (Ryger homologated upper 54 mm, lower 36 mm, stroke 54 mm pumping capacity lowered from 125 cc to 68,6 cc)
Bookmarks