Tuesday, July 15, 2008

ngv fuel plus

1. What is NGV
NGV or methane is the lightest hydrocarbon. It is often extracted from underground but not always associated with oil and coal deposits. Methane is a by-product of decomposing organic matter including the rotting of dead plants, garbage dumps as well livestock manure.
2. NGV cars are cheaper to run
This is true due to the huge price gap between petrol and NGV although the fuel consumption of an NGV vehicle per liter is higher compared with petrol. However NGV do need some extra maintenance on top of your current maintenance list and possible replacement are:
i) Reducer. It drops the gas pressure from 220 bar to 1.8 bar. This component uses a diaphragm. It needs to be serviced and the diaphragm replaced at regular intervals.
ii) The Gas Injectors. All modern system today use multiple gas injectors with one injector for each port. There parts will wear out and leak, and have to be replaced as and when necessary.
iii) Pressure Sensors
iv) Gas ECU. Normally ECU are supposed to last the life of the vehicle, they can fail at any time.
v) Refuelling Valve
Also regular NGV tune-ups are necessary to reap the full benefits of using NGV. It also known that a higher compression ratio allows engine to get more power. However, this cannot be done yet because of shortage of filling stations. Vehicles have to be set up to run on duel fuel and this, the compression and ignition timing cannot be set at the optimum.
Note that NGV has an Octane rating of 130 compared with 97 for premium petrol and there is a power loss of between five and 15 percent when switching to NGV but in actual practice is hardly noticeable.
3. Safety
There have been some safety concerns with the use of NGV. Be assured that so far as the gas tank and other NGV components are concerned, all suppliers use equipment that have been certified by safety standards. For example, all tanks need to pass a fire, drop and gun test according to ISO requirements. It’s only need is to be retested once every five years.
The weak link in the chain is the actual installation and thigh pressure line that runs underneath the car. This line can subjected to damage and subsequent leaking.
Although NGV is a flammable gas, basically NGV is as safe, if not safer than petrol. It has a narrow flammability range and must have and ideal conditions in order to ignite. NGV will not ignite if the mixture is too rich or too lean. It als disperses quickly as is lighter than air compared to petrol and LPG which are heavier.
4. NGV cars are cleaner than Hybrids car
This is partly true because if NGV run at proper compression ration, it is very clean burning with practically no CO, NOx or emissions. Overall , NGV vehicles can be said to be “Green” car or “Greenhouse Neutral” because the fuel coms from organic material.
5. NGV Vehicle Maintenance
i) Lubricating Oil. NGV is cleaner burning and it is not a liquid. As such, there is practically no oil contamination and the oil stays cleaner for a longer period.
ii) NGV is a “dry” fuel and lacks the lubricating properties of a liquid fuel. Therefore is it important that a vehicle using NGV has hardened valve seats.
iii) Weight problem.Some concerns about the weight of the fuel tank and its effect on the rear suspension. With the increasing use of GRP woven tanks , weight is no longer a problem and so as the worries of suspension and braking.
6. Traveling Range KM (Miles)?
A major complaint about NGV use is that of range and the need to fill up regularly. Unfortunately , NGV conversions are retro-fits and the vehicles were not designed to carry such large fuel tanks. In order to have sufficient gas capacity , one has to sacrifice boot space.
One needs to look at the total cost of operating with NGV compared with using petrol. An average conversion is about usd300 for normal car and usd1700 for any large vehicle that would benefit the most from such a NGV conversion. Cost per km for NGV usage compared with petrol is about 7 cents per / km and 20 cents per / km respectively for such a vehicle. thus, the saving in fuel cost is 13 cents per km . This mean owner of NGV car would need to travel about 46,000km for ROI ( return of investment ) with the initial NGV installation cost.
It may take at least three years for normal commuter to recover the cost and this is based on assuming that the price of NGV will not increase.

Cylinder: Methane stored at high pressure up to 3,000psi
High Pressure Pipe: Sends methane from cylinder to regulator
Pressure regulator: Pumps cylinder gas to engine via intake manifold
Low Pressure Hose: Sends low pressure gas from regulator to mixer
Mixer: Mixes air and gas before they go into the combustion chamber
Anti-contaminant Electronic System (AES): The controller that processes data from various parts and regulates stepper motor actions
Stepper Motor: Controls how much gas enters the engine
Oxygen Sensor Emulator: Detects oxygen level and relays data to AES for processing
Injector Emulator: Stops the fuel injectors from squirting petrol by tricking the ECU and onboard diagnostics when the engine is using gas
Digital Advance Corrector (or Timing Advance Processor): Controls engine timing when using gas
Changeover switch: In a bi-fuel engine, it allows driver to switch between using petrol or gas
Refuelling valve: For filling up gas
Source : Star

Top 10 Fuel Saving Tips
From Aaron Gold, cars.about.com
Your Guide to Cars.

Whether you drive a two-seat hybrid or a three-ton SUV, chances are you can squeeze a bit more distance out of each gallon of fuel -- and at today's gas prices, an improvement of just one or two miles per gallon (MPG) can really add up. These ten fuel saving tips have served me well over the years, and they can help you improve your car's fuel economy and take some of the sting out of high fuel prices. Most of these tips will give you a very slight increase in MPG -- but use several together and the gas mileage improvements will really add up.
1. Slow down
One of the best ways to save gas is to simply reduce your speed. As speed increases, fuel economy decreases exponentially. If you one of the "ten-over on the freeway" set, try driving the speed limit for a few days. You'll save a lot of fuel and your journey won't take much longer. (Just be sure you keep to the right, so you won't impede the less-enlightened.)
2. Check your tire pressure
Under-inflated tires are one of the most commonly ignored causes of crummy MPG. Tires lose air due to time (about 1 psi per month) and temperature (1 psi for every 10 degree drop); under-inflated tires have more rolling resistance, which means you need to burn more gas to keep your car moving. Buy a reliable tire gauge and check your tires at least once a month. Be sure to check them when they are cold, since driving the car warms up the tires along with the air inside them, which increases pressure and gives a falsely high reading. Use the inflation pressures shown in the owner's manual or on the data plate in the driver's door jamb.
3. Check your air filter
A dirty air filter restricts the flow of air into the engine, which harms performance and economy. Air filters are easy to check and change; remove the filter and hold it up to the sun. If you can't see light coming through it, you need a new one. Consider a K&N or similar "permanent" filter which is cleaned rather than changed; they are much less restrictive than throw-away paper filters, plus they're better for the environment.
4. Accelerate with care
Jack-rabbit starts are an obvious fuel-waster -- but that doesn't mean you should crawl away from every light. If you drive an automatic, accelerate moderately so the transmission can shift up into the higher gears. Stick-shifters should shift early to keep the revs down, but don't lug the engine -- downshift if you need to accelerate. Keep an eye well down the road for potential slowdowns. If you accelerate to speed then have to brake right away, that's wasted fuel.
5. Hang with the trucks
Ever notice how, in bad traffic jams, cars seem to constantly speed up and slow down, while trucks tend to roll along at the same leisurely pace? A constant speed keeps shifting to a minimum -- important to those who have to wrangle with those ten-speed truck transmissions -- but it also aids economy, as it takes much more fuel to get a vehicle moving than it does to keep it moving. Rolling with the big rigs saves fuel (and aggravation).
6. Get back to nature
Consider shutting off the air conditioner, opening the windows and enjoying the breeze. It may be a tad warmer, but at lower speeds you'll save fuel. That said, at higher speeds the A/C may be more efficient than the wind resistance from open windows and sunroof. If I'm going someplace where arriving sweaty and smelly could be a problem, I bring an extra shirt and leave early so I'll have time for a quick change.
7. Back off the bling
New wheels and tires may look cool, and they can certainly improve handling. But if they are wider than the stock tires, chances are they'll create more rolling resistance and decrease fuel economy. If you upgrade your wheels and tires, keep the old ones. I have fancy sport rims and aggressive tires on my own car, but I keep the stock wheels with a good narrower-tread performance tire in the garage. For long road trips, the stock wheels give a smoother ride and better economy.
8. Clean out your car
If you're the type who takes a leisurely attitude towards car cleanliness -- and I definitely fall into that category -- periodically go through your car and see what can be tossed out or brought into the house. It doesn't take much to acquire an extra 40 or 50 lbs. of stuff, and the more weight your car has to lug around, the more fuel it burns.
9. Downsize
If you're shopping for a new car, it's time to re-evaluate how much car you really need. Smaller cars are inherently more fuel-efficient, and today's small cars are roomier than ever -- one of my favorite subcompacts, the Nissan Versa, has so much interior room that the EPA classifies it as a mid-size. Worried about crash protection? The automakers are designing their small cars to survive crashes with bigger vehicles, and safety features like side-curtain airbags and electronic stability control are becoming commonplace in smaller cars.
10. Don't drive
Not a popular thing to say on a car site, I know, but the fact is that if you can avoid driving, you'll save gas. Take the train, carpool, and consolidate your shopping trips. Walking or biking is good for your wallet and your health. And before you get in your car, always ask yourself: "Is this trip really necessary?"
NGV fuel saving