Valve Seats Recut & Valves Refaced

Distortion

If your engine has been overheating it can distort the valve seats and the face of the valve from constant expansion and contraction, hot and cold. This distortion causes the valve not to seal correctly. This leads to loss of performance due to the compression in the cylinder leaking past the badly seated valve or valve face. If a valve seat has distorted by two thousands of an inch or more the valve simply will not seal. Valve seat cutting is done in many different ways, from lapping valves in with a valve lapping tool to using machinery,  but by far the best is using a carbide bladed cutter on an 'air float' valve seat and guide machine.

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Wear

Valve seats and valve faces can also wear as a result of high milage on vehicles and on heavy usage vehicles, such as, commercial and agricultural. These vehicles have worked hard for many hours resulting in valve seat  and valve face wear. This can be resolved by recutting the seats and refacing the valves, giving you a fresh seating area on both mating surfaces, which will recreate the seal needed for the best performance from your engine.

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LPG Converted Vehicles

Running an engine on LPG can dramatically shorten the life of a valve seat due to the extra heat. Valve seat regression is common. We can supply and fit valve seat inserts specifically designed for LPG converted cars.

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Unleaded Conversions

Due to the lack of lead additives in modern fuel, classic cars are 'converted' to run on unleaded fuel by fitting hardened valve seats. This process requires us to remove a pocket in the cylinder head to allow a valve seat insert to be fitted.

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3 Angle Valve Seat Cutting

Widely used in competition engines, a 3 angled seat improves flow. The normal angles used are 60 degrees for the throat angle, 45 degrees for the main and 30 degrees for the top angle. Although many different combinations can be used depending on the application. A good 3 angled valve seat can only be achieved on a highly accurate machine.