In this tutorial, Frank Burguera of California Motorcycles explains how the valve frosted process is performed. The frosted or lapping should be performed when the valve, valve guides or any other type of engine cylinder head are replaced.
To get a uniform finish and a perfect settlement of the valve with your seat we must proceed step by step with specific techniques and users.
In this video we will teach the process of a valve frosted, where the type of valve and its diameter does not matter, the important thing is the uniformity of the gray color by blurring with the emery paste both the angle of the valve and the cylinder head . Getting a perfect adaptation is the guarantee of the sealing of the unit volume (mixture) of the combustion chamber, thus being able to achieve a greater compression ratio if pressure lost.
Not only do we need to safeguard all compression ... but also have the maximum amount of thermal conductivity between valve and its seat ... Why? Well, we need to dislodge the maximum camera temperature and that is through the seat where it is transferred to the interior cooling circuit of the cylinder head and logically in each gas flow exhaust towards exhaust.
A perfect settlement offers us an air flow rate (CFM ‘s), because this will not create carbonate hooked in the seat and can cause bad valve closure and if it seats and this will only be achieved by making a perfect valve treasure. If we do not watch the pasta and descend through the guide we will create axial and radial lines where it will raise the radial game of this and favor the hook of the carbon on the seat, creating more height and bad closure, losing compression and favoring the self -chire of the valve, since this will not contact its seat to the fullest and will not evict its temperature, being able to create hot spots "and its consequent self -chire and destruction of the engine.
When performing the process we must remember to mark with a type or with a chalve at the base of the valve the enumeration of each of them and that seat belongs, since each valve when proceeding with its personalized frosy will adapt to its small imperfection being very Important not mix them. The number of passes is almost as important as the height of these when it leads to rectifying a cylinder head and leave you all the valves at the same height, since here the wear in the valve shell will mark a finish and a perfection ... an average Correct can be 10-15 passed by valve.
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