The interaction of the combustion and
intake valve phasing on torque and combustor cylinder specific fuel combustion was studied by varying the valve and injection timings, keeping the start of combustion phased to the point of
intake valve closure (Figure 6).
Prior to each test, the mass of each
intake valve was recorded and fuel injector spray patterns were visually evaluated for spray pattern consistency.
The
intake valve closing at low speeds is not of great importance; thus it is a low setting, but as the speed gets higher we need more time for the valve closing to achieve optimal power.
At this point, the outflow valve is close and the
intake valve is open.
In addition, the
intake valve detergent additives in autogas, which cause combustion chamber deposits in cars, are particularly detrimental when they get in the oil.
At 4,950 rpm, the powertrain control module opens an electric spool valve routing pressutized oil to small pistons in the
intake valve rocker arms.
That's despite two key disadvantages: the flow of air and fuel tends to stack up behind the
intake valve, requiring elaborate fixes such as a turbocharger to force the flow past the bottleneck; and optimizing the valve's opening and closing for low speed operation means less efficiency at high speed, and vice versa.
When it reaches a pre-set level, the float arm (f) closes the
intake valve, and the resupply stops.
An
intake valve lift sweep on 3 valve lifts - 100%, 75% and 50% lift.
The number six
intake valve lifter broke apart in flight, damaging the case and number five and six cylinders and pistons, causing metal contamination of the oil system.
Spanair said it did not know the cause of the disaster but the aircraft had an overheated air
intake valve before a first attempt at take-off.
Tokyo, Japan, June 12, 2007 - (JCN Newswire) - Toyota Motor Corporation announced today that it has developed Valvematic*, a variable valve lift mechanism created through combining VVT-i (Variable Valve Timing-intelligent), which continuously controls
intake valve opening/closing timing, with a new mechanism that continuously controls the
intake valve lift volume.
