

The parts of the engine, when heated, expand. The valves in the last longer (more precisely, the tails of the valves) with the heat, it is important to leave a game cold between tail-to compensate for the valve and the rocker arm, this extension is too hot. The game with the valve thus allows the valve to move correctly, although dilated.
A lack of or a lack of valve clearance leads to a loss of the compression of the engine, and a risk of the wire mesh valve . In fact, the valve can not close correctly, tends to overheat, because she needs time on his seat in order to dissipate the heat.
With 17 blades :stainless steel