Conversation Between shambmk and Roelof

The mod does not do much. Mr Sing does promise a better milage with real turbo engines but that is not noticeable with our small nitro engines. What was noticeable was a tiny bit more power in the midrange RPM. The idea of 3 grooves is enough, with the coloring of the pistion you could see there was a wider mark on the piston of the combustion.