Internal combustion engine intake valve

Details Internal combustion engine intake valve Internal combustion engine intake valve

1987-02-24

1988-10-25

Scott, Samuel

Internal-combustion engines

Valve

Valve head cooperates with manifold

123188AA, F01L 306, F01L 320

Patent

active

047795840

ABSTRACT:
An improved intake valve for an internal combustion engine is provided. The improved valve has a ridge extending from the downstream side of the periphery of the valve head to aid in the improved aerodynamic flow of the fuel mixture gas through the valve opening. The ridge acts as the center portion of an ideal air foil and thus reduces the back pressure, and hence the drag, presented by the valve to the flowing gas fuel mixture. By reducing the drag, more fuel mixture in a given time and space can be provided into the combustion chamber and the horsepower of a given size engine is increased. In other words, a smaller and lighter engine can be used to do the same work, with the net result of better fuel economy, better packaging, lower production costs and so forth. Alternatively, a given sized engine can be made to produce more power. The size of the ridge is selected to be between five and twenty five percent of the valve head diameter and a thickness of the ridge wall is selected to be as narrow as possible consistent with long term performance. The ridge on the bottom of the valve head also flows less efficiently in the reverse direction, thereby allowing more desirable valve timing and cycle overlaps.

REFERENCES:
patent: 2090800 (1937-08-01), MacDonald
patent: 3626815 (1971-12-01), Fingeroot et al.
patent: 4475494 (1984-10-01), Huther

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