Although Silicon bronze valve guides were used for their extremely good wear values, they were very hard and not user friendly when fitting. Where possible we have now introduced the Manganese bronze guides which have good cutting properties and good wear characteristics and are original equipment on Porsche and Mercedes. Bronze alloy valve guides are recommended when using EN214N steel valves. Exhaust valve guides should be opened up 1/2 thou (0.0005")more.
Ventilstyringer - bronse
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