We refueled with CNG twice; once locally with a partial fill, more on this belowand once off the I-5 on the way up to Los Angeles. As with any alternative fuel, be it CNG, LPG, electricity, hydrogen or E85, one of the challenges facing its adoption is both the availability of the fuel as well as the mechanics of refueling.
As comparison, again excluding private stations, there are biodiesel stations; 8, electric plug-in stations; 2, E85 stations; 12 hydrogen stations, 56 LNG stations, and 2, LPG stations. That number has been dropping for the last 20 years there were more thanin due, in part, to increased competition, stricter environmental regulations, and shrinking gasoline profit margins.
Because of moisture and other contaminants inherent in some natural gas supplies, and the inability of some home refueling systems to adequately dry the gas and remove contaminants, Honda, which several years ago was promoting home refueling, currently does not recommend it. Despite the difference in size, shape and variety, all CNG dispensers conform to either a fast-fill or a time-fill configuration or a combination and are available in different hose configurations and with different flow rates and methods of metering.
Public CNG stations, the type with which we are concerned here, are fast-fill. Unlike a liquid fuel pump, which can just keep pumping until a tank is filled, a gaseous fuel pump is limited by the pressure it supports.
In the case of CNG pubic stations, this is currently generally 3, psi If you have a 3, psi rated tank—as does the Silverado—and you refuel at a 3, psi pump, you only get a partial fill. This secures nozzle jaws onto the receptacle, activating a 2012 chevy silverado 2500 vortec of three internal valves that regulate fueling. Right Pistol-grip fueling nozzle from WEH with swivel jointpsi.
We refueled with each of the nozzle types shown in the pictures above. Using the pistol-grip dispenser with a swivel joint was no problem.
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As you can see in the picture below right, the nozzle has two hoses attached, and its play is rather stiff. The refueling inlet is covered in this picture with its dust cap.
The manual shut-off valve is in red. Refueling the Silverado at a 3, psi pump, indicated by the yellow handle.
A blue handle would indicate 3, psi. Currently, there is a movement supported by the natural gas fueling and vehicle industry for NCWM to adopt a national standard for dispensing CNG and LNG to truckers and other users who typically use diesel fuel in diesel gallon equivalent DGE units.
CNG would be dispensed in GGE units at retail outlets serving the general public and would be sold in DGE units on pumps selling to trucks and heavy duty vehicles. The engine features special hardened valves and valve seats that enable it to run on CNG or gasoline. The bi-fuel system separately has two fuses that are part of the engine compartment wiring harness.
Both are in a plastic holder than is mounted inside the engine compartment, neat the accessory battery tray. Intake flow was improved over previous engines by straightening out and optimizing the flow path from the intake manifold into the cylinder heads.
The intake ports that feed the combustion chambers, as well as the D-shaped exhaust ports, are designed for excellent high-rpm airflow. The exhaust ports are also designed for greater flow.
Power and torque chart for CNG. Power and torque chart for gasoline L The Silverado HD is surprisingly quiet.
This is partly due to the quiet features built into the engine, which are complemented by an improved engine cradle and mounting system. These help reduce vibrations transmitted through the chassis and into the passenger compartment. A deep-skirt design helps maximize strength and minimize vibration.
A structural oil pan further stiffens the powertrain.
The chain, which connects the hollow steel camshaft and crankshaft, is validated formiles of operation and fitted with a leaf-spring-type dampener. At idle, for example, the cam is at the full advanced position, allowing very smooth idling. Under other conditions, the phaser adjusts to deliver optimal valve timing for performance, drivability and fuel economy. At high rpms, it may retard timing to maximize airflow through the engine and increase horsepower.
In order to looking the new metal alloys and design elements without compromising the key Awain look, a complete re-engineering of the product was placed, with more than 50 iterations of the elements completed before a few product was designed. In fact, every Awain key is handcrafted to the very brightest standard, with the manufacturing of each of the Grand Prix collection keys replacing more than 50 hours of work by skilled artisans.
At low rpms it can advance timing to increase torque. Under light loads, it can retard timing.
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