Abstract
The influences of the installations of the camshaft support, and timing system and the heat release on the valve gap of the gasoline engine were analyzed in the present. The experiments were carried out on 50 4-cylinder 4-stroke gasoline engines, and the results indicate that to tighten the camshaft support has a great impact on valve gap, the indicated mean there was an obvious deformation in cylinder head after the camshaft support was tightened. The timing system also has a significant influence on the valve gap because it produces a downward force to the camshaft, leading to a smaller valve gap near the timing system and a bigger valve gap on the other side. It was also found that with the increase of temperature the valve gap was 0.1 mm larger than that in the normal state.
Highlights
The inlet and exhaust valves are the important parts of the engine valve train
The objective of the present study is to investigate the effect of the installations of the camshaft support, and timing system and the heat release on the gasoline engine valve gap
To ensure the cylinder head deformation was not affected by the camshaft support, the valve gap was measured for the third time after the cylinder head bolts were tightened
Summary
The inlet and exhaust valves are the important parts of the engine valve train. Its function is to ensure the engine can absorb as much inflammable gas as possible during the intake stroke and to seal the combustion chamber during the compression power strokes. A number of studies have demonstrated that the variable valve timing technology can potentially improve engine torque and power, reduce automotive emissions and fuel consumption [4,5]. A small valve lift at a low engine speed will increase the negative pressure in cylinder and intake eddy, which helps improve the fuel-air mixing and fuel economy and increase the torque at the low speed. If a multi-cylinder engine is operated at low loads, the valve lift of a few cylinders can be reduced to zero to realize cylinder deactivation technology [6]. This approach effectively decreases the fuel consumption
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