Abrasive brush GH series

honingfinishingsilicon carbide

Don't be fooled by fixed diameter brushes that claim the ability to produce a proper plateau finish. The only way to obtain a true plateau is to apply even pressure while honing. Typical honing leaves a series of microscopic "peaks" and "valleys" in a cylinder. The valleys created during honing act as oil reservoirs to provide lubrication when the engine is running. The "peaks," on the other hand, are worn off by the piston rings as the engine is broken in -- thus leaving a "plateaued" surface above the valleys. Sunnen's PHT Plateau Honing Tools plateau hone from the start and leave the worn off peaks of metal in the honing machine, instead of in the motor oil of the engine.