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Show Good Ideas Sometimes May Become Quite Silly Frequently it is necessary to put an end to good ideas that gain so much headway they become foolish.- Generous Gener-ous tappet clearance is an advantage in hill climbing and does give a snappy snap-py motor, but there Is great danger in carrying the idea too far. If there is too much noise, it may mean there is a great sacrifice in power. Also much depends upon the make or type of engine. Where valves are of cheap metals with a tendency to excessive expansion, loose tappets will make for power, but only when the engine is warmed up. Since most engines en-gines are hot when they reach the real struggle on hills, excess tappet clearance clear-ance is proper for engines of such construction. con-struction. Where valves are designed to compensate for their own expansion, expan-sion, however, noise may be a real loss of power. . The danger lies in applying the noise-power noise-power theory to the wrong engine, to the wrong conditions or by overdoing the idea. If valves do not lift fully, they will not let in enough gas nor exhaust ex-haust burned gases quickly enough. This means power loss. Some drivers do most of their hill climbing when their engines are cold. The less tappet clearance the better under such cir-j cir-j cumstances. |