Valves in the cylinder--burned exhaust valve
shows nonsym-metrical color pattern and green burn area at lower, left edge.
Instantaneous vibration waveforms during 10 work cycles of the engine in good technical condition and with the defective exhaust valve
are shown in Fig.
To experimentally assess the potential benefits of early EVC, the exhaust valve
timing was advanced by approximately 31[degrees]CA by rotating the exhaust camshaft 2 cam-sprocket teeth from the baseline position.
The effective orifice areas [A.sub.iv] and [A.sub.ev] (including the discharge coefficient) depend on the intake and the exhaust valve
lift maps [l.sub.iv] and [l.sub.ev] provided by the manufacturer.
This study explores the ability to use a high compression ratio GDI engine and open the exhaust valve
at the end of the compression stroke immediately before fuel injection to bleed off pressure.
Improved engine life and exhaust valve
lifespan through reduced cylinder temperatures.
Both the intake and exhaust valve
are predicted to exceed the minimu[m.sup.2]-year design life under naturally aspirated conditions throughout the entire power range, and under turbo-charged peak BMEP conditions.
In applications where a fast response time on modulating service, is required, the VBP also eliminates the need for an additional poppet or Quick Exhaust Valve
to achieve the required closing speeds.
An example of Chatten's patented invention uses a simple co-axial planetary gear mechanism to provide "infinite discrete control of all the valve events" including the exhaust valve
opening (EVO), exhaust valve
closing (EVC), inlet valve opening (IVO) and inlet valve closing (IVC).
The relationship between the exhaust valve
head diameter and the valve stem diameter are shown in Figure 16.
They were developed after in-service cylinders developed certain specific failure modes, including cracks resulting from reduced wall thickness (AD 2009-19-07), and cracks near the exhaust valve
and barrel separation (AD 2009-16-03).
Edwards' XDS-C dry scroll pumps are fitted with a Chemraz gas ballast non-return valve pad and exhaust valve
pad, and stainless steel exhaust flange.