Brush Research Manufacturing Announces Flex-Hone® for Valve Jobs on Classic Engines

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Valve guide hone is a key part of the engine overhaul when converting classic cars from leaded to unleaded

For classic cars that require leaded gasoline, there is much to be gained by overhauling the engine so that it can use regular unleaded. Leaded gasoline boosted engine compression, reduced knocking, and provided lubrication for valves and seats. An inexpensive octane booster, anti-knock agent, and valve wear preventive, tetraethyl lead (TEL) also fouled spark plugs, gummed up engines, and polluted the air via automobile emissions. Today, most countries, including the United States, have banned TEL from motor fuels.

As a result, owners of classic cars, the end of leaded gasoline means lead substitutes, alternative fuels, or engine overhauls.

To accomplish the engine overhaul, mechanics can complete a valve job, which often includes new valves, guides, hardened seats, value springs, and Viton seals. The right tools for the job are important, as well, including the use of a small diameter valve guide hone.

Valve Guides and Bronze Inserts
Although some engine builders replace their valve guides altogether, others keep the factory originals by using bronze inserts. Acting as a valve stem bearing, the bronze insert is driven into the factory value guide.

Bronze inserts are an economical high-wear answer to valve job life because they wear well and control oil flow to valve stem. Measure the valve stem to the proper size, and then use a ball hone from Brush Research Manufacturing to improve the surface finish.

The Flex-Hone for Valve Guides
Built with a stiff metal steam and abrasive nylon filaments, the Flex-Hone® from Brush Research Manufacturing (Los Angeles, Calif.) is a cylinder honing tool that features abrasive globules for a soft cutting action.

The abrasive globules are bonded to the ends of flexible nylon filaments. Each has independent suspension that assures the cylinder hone to be self-centering, self-aligning to the bore and self-compensating for wear.

Unlike honing stones or other rigid hones, Brush Research’s flexible hone produces a uniform pattern of peaks and valley for optimum oil retention. The result is that more lubricant is retained, improving engine startup and performance.

The Flex-Hone can be used in any rotating spindle, including hand drills making it an ideal tool for secondary finishing, custom field finishing or even DIY applications.

Valve guide hones from Brush Research are available in a variety of small diameter sizes. The company can also provide custom honing tools in the size, shape and abrasive grit to fit any automotive application.

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Heather Jones
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