How is a chrome liner cheap? If you are unfamiliar with model engines, I'm saying that many model engines have chromed steel liners inserted into aluminum crankcases. When you get up to 20+CC gasoline engines you see chromed aluminum cylinders (integral cylinder and liner) as standard practise. Your Enya has a steel sleeve that is not plated. An OS four stroke has a steel sleeve that is nickel plated. A Magnum has a steel sleeve that is chrome plated. The chromed steel sleeve will last the longest. Very few glow engines have chromed aluminum cylinders in modeldom, mainly racing engines, the only exception are Saito four strokes that have for some time now have had chromed aluminum bores like gasoline engines. I've never heard of the chrome failing. Saito engines are light for their size.