Engineering Magazines

It has been 114 years since Rudolph Diesel applied for a patent for his new improved engine. It was hoped to replace the gasoline engine but as we can all see that this has not happened. The gasoline engine having just been invented in 1876 was still considered inefficient in fuel consumption and power. An evaluation of each engine’s performance tells a story that is difficult to reconcile with the way things have shaken out in the beginning of the 21st Century. The invention of the Diesel offered the world a far more efficient and effective fuel based engine. It actually provides more horsepower per gallon or liter than a gasoline. This is why diesel engines power our large earth moving equipment, trucks, marine engines, low mileage cars and now aircraft.

The diesel is a combustion injection engine. Unlike the gasoline engine, air is compressed first and then the fuel is injected into it. The compressed air is hot enough to ignite the diesel fuel without the use of a sparkplug. Diesel engines developed out of the earlier work surrounding two engines; the original diesel design and the solid injection system of Herbert Akroyd Stuart created in his hot bulb engine. This means that the upward stroke of the diesel engine compresses the air to where its’ temperature is between 1300-1650° F. When the piston has reached the top of its’ upward stroke, diesel fuel is then injected, combustion occurs, pressure increases and pushes the cylinder downwards. This motion is transmitted by means of the connecting rods to the crankshaft which itself turns thus transmitting rotating power to a drive shaft which powers ships, cars, generators, aircraft and even motorcycles.

During cold weather, diesel fuel thickens when the wax crystallizes. It becomes a gel and the fuel injection will not easily work. Technological advances have made this a problem of the past. The fuel lines and fuel filter can be pre-warmed, others use a glow plug in the combustion chamber to pre-heat its’ walls, some use resistive heaters in the intake manifold to warm air taken into the combustion chambers and engine block heaters are used in areas like Kansas or Nebraska when automobiles are left in the cold overnight.

Diesel engine speed used to be controlled by governing the rate of fuel through a gear system. Today the use of electronically controlled engines ECM (electronic control module) allows diesel engines to adjust their timing to start according to the environmental conditions of heat and cold, regulate the engine speed in terms of RPM (revolutions per minute) and maintain fuel economy.

Diesel engines may not have beaten its’ chief contender, the gasoline engine, but it has kept ahead in terms of heavy machine and naval engines. It has recently performed outstandingly in the area of remotely piloted vehicle engines, set amazing land speed records for racecars and motorcycles. The diesel engine has improved amazingly in the past 114 years. The use of electronics has given all engines abilities of fuel conservation unheard of in past years. This makes the diesel engine a real budget-winning contender. This year the new 2006, Volkswagen diesel won fourth place in the best mileage evaluation according to http://www.fueleconomy.gov. Diesels may prove to be the green vehicle engine of choice in the future since they have very little carbon monoxide emissions. Catalytic converters and diesel particulate air filters have made diesel engines free from particulate, nitrogen and sulfur oxides. Diesel engines may prove to be the easiest solution to greenhouse gases.

Here are some of the standard foreign and domestic automotive maintenance procedures that you should be sure to have done periodically:

Oil Changes: This is one of the most obvious, yet it is also one of the most frequently overlooked. Changing your oil and oil filter every three thousand miles keeps your engine running smoothly. Not changing your oil and oil filter often enough, on the other hand, can be disastrous: Over time, the additives in your engine oil break down, and the oil becomes thick and sludge-like. When this happens, the oil creates resistance on the engine, causing buildup and premature wear. Old engine oil can also cause the rubber seals in your engine to prematurely dry out and crack, creating leaks that can be quite expensive to fix.

There are a lot of quick-lube places that will change your oil quickly and cheaply, which may make you question the need to take your car to a good foreign or domestic automotive maintenance shop. However, it is definitely worth the extra money to make sure an experienced professional services your car. It is not uncommon for quick-lube shops to employ inexperienced teenagers at minimum wage, and horror stories (driving off without oil in the engine, finding months later that the oil plug won’t come out because it was stripped) abound.

Air Filter Replacement: Replacing the air filter is another important precaution that many people forget about. The silly thing is that this is also the easiest thing you’ll have to do on your car. Just as easy, if not easier, as filling the washer fluid on some cars. In fact, this one is so easy that you may not even have to get a foreign or domestic automotive maintenance shop to do it for you. Just make sure you get a high quality replacement filter. If you are not sure where it goes, ask. There will be a couple of clips you’ll have to undo to open the air filter box, but that’s about it.

Your air filter should be replaced once or twice a year. Every six months, you should at least check it. If it looks dirty, replace it. The better airflow your engine gets, the better it will perform, which to you means higher gas mileage and lower maintenance costs over time.

Basic Tune-Up: A tune-up basically involves replacing a bunch of inexpensive, quick-to-wear-out parts, and checking out a bunch of more expensive, slower-to-wear-out parts. This should be done once a year, but again, many people aren’t very good at making sure it gets done regularly.

A basic tune-up involves replacing (or cleaning and re-gapping) your spark plugs, replacing your distributor cap and rotor, and checking and/or replacing your spark plug wires. Other parts that might need to be replaced during a tune-up are your PCV (positive crankcase ventilation valve) and your oxygen sensor. All of these can affect the way your car runs, causing your gas mileage to go down and the carbon monoxide in your exhaust to go up.

Radiator Flush and Coolant Replacement: Your cooling system is a vital system. It prevents your engine from overheating, which can ruin an entire engine in mere minutes. Your cooling system therefore ought to be treated with respect, which means flushing your radiator and replacing the coolant every year or so, preferably at the end of summer or fall, before the cold weather hits.

The reason for flushing your radiator and replacing the coolant is that the Ph balance in antifreeze breaks down after a while, destroying many of its protective properties. Not only will it not cool to as low a temperature, but it will also begin to allow rust to form in your cooling system, which may lead to premature leaks in your radiator.

Be sure your replacement coolant is half water and half antifreeze. The 50/50 mixture has the lowest possible freezing temperature, the highest possible boiling point (meaning your coolant won’t boil on hot days), and will protect against corrosion inside the system.

Automatic Transmission Fluid and Filter Replacement: Many people don’t realize that their automatic transmission contains fluid and a filter that need to be replaced periodically, just like an engine. Unfortunately, neglecting this maintenance repair can result in parts in the transmission going out more quickly than they should, requiring you to overhaul or replace your transmission, which is a costly venture, to say the least.

The fluid and filter in your automatic transmission should typically be replaced about every 25,000 miles, which is less than a year’s worth of driving for most cars. The oil in a standard transmission doesn’t need to be replaced as frequently. Replacement about once every couple of years, unless you happen to do a lot of hard driving, such as towing.

Keeping up on these five preventative maintenance repairs will ensure that you maximize the life of your car. A good foreign or domestic automotive maintenance shop can help you keep track of the required maintenance, making sure that you don’t miss anything important.

Some owners keep their automobiles running like finely tuned Swiss watches. They carefully follow all of the manufacturer’s recommendations in the owner’s manual. They buy premium grade oil, order regular check-ups and rush to the repair shop when they detect any unusual noise.

However, most of us are inclined to skimp a little on maintenance and some of us never see the repair shop until the car quits. Sometimes this is due to finances but most of the time it is a matter of convenience. We need our cars to take us where we have to go and we’re reluctant to give them up even for a short period of time.

But, now that gasoline is still at astronomical prices, we need to re-think our maintenance practices. Letting some things go can cost us money in extra fuel consumption. For instance, repairing a faulty oxygen sensor can result in a 40% improvement in gas mileage. Tuning an engine can increase mileage by 4%.

You should be sure that your air filter is always clean. If your engine is fuel injected, airflow regulates the quantity of fuel that is burned. The process of mixing air and fuel is quite precise so the filter needs to be clean to ensure an efficient mixture. The air filter also protects your engine from impurities, extending the life of the engine as well as saving on gas.

It is also important to check oil regularly and change dirty oil. An engine with clean oil operates at maximum efficiency, which translates into gas savings. You should definitely use the grade of motor oil recommended by the manufacturer. Using one weight oil in an engine designed for a different weight can lower gas mileage up to 2%.

You can also realize greater efficiency from using a high-quality multi-grade oil but if there is a price difference you need to compare the costs involved.

And when your tires are not properly inflated, your gas mileage decreases by 5%. The Environmental Protection Agency estimates that millions of American cars run on tires that are not correctly inflated. Correctly inflated tires will also last longer and are safer.

The owner’s manual always states the correct pressure for the tires. If you are driving a pre-owned car with no owner’s manual, you can call a local dealer or research the information on the net.

Radial tires are supposed to improve gas mileage by 5% when driving in the city and by 7% when driving on a highway. So if you don’t already use radials, you might consider switching.

Another benefit of radial tires is that they last longer. However, you should be careful not to mix radials with conventional tires unless the owner’s manual clearly states that this procedure is acceptable for that model car.

In addition, tires need to be properly balanced. Properly balanced tires reduce road friction thereby increasing fuel efficiency.

You also need to check wheel alignment to ensure that wheels are properly aligned. Wheels that are out of alignment also cause your car to burn extra fuel.

Although the savings from each practice might be small, the overall savings is worth the extra effort.

What do we all want while driving? To provide for our families, loved ones, and what have you. How do you accomplish this? There are a whole slew of roads to travel, but one main ingredient is a family car that is always 100% reliable. And if driving creates you running errands faster, to save money on gas, and decreasing air pollution, you win twice. Your 1993 Ford Tempo or whichever car, truck, van, or boat you drive needs to be performing at top capacity.

The most important thing you can do for your car is make regular auto maintenance check-ups, service all the automotive liquids. Oh, by the way, be sure to check your car’s liquids every 2 weeks. That means your oil, coolant, power steering fluid, and transmission liquids. Make checking your tires a constant too. My ex-girlfriend recently called me up and cried that one of her tires exploded driving under a freeway. Yikes. Also, don’t forget to maintain a proper fuel tank level according to your particular car’s engine (see car owner manual). A car owner manual is like the bible of your vehicle. If you don’t already have one, get one. You’ll wish you had one if your car breaks down in the desert.

Your car engine will thank you with better performance and quicker reaction times, which is an essential part of keeping you and your family and friends safe on the road. Make yourself aware of this info. It may save the life of your engine one day. It will save you money on gas and auto maintenance.

Choose the right fuel. Your vehicle is designed to take regular unleaded fuel, which will have this symbol (87) on the pump at the gas station. The 87 symbol refers to the level of octane in the fuel. Using lower grade of fuel will jack up your car engine and will cause heavy knocking, which could easily damage your engine. I drive a Ford Tempo, and my car owner manual says to use the 87 grade of gas.

Higher grade fuels will protect your fuel system from rusting and protect against fuel lock in the fuel system (causes engine to hesitate/stall and hard to restart). In addition, it will minimize fuel deposits in fuel injection system, and prevent your engine from knocking/pinging.

Higher grade fuels will also prevent the fuel system from “gumming up” when not run for long periods of time, not to mention help your, Ford Tempo perhaps, start more easily in winter while assisting in help the prevention of freezing fuel lines.

Tips to increase gas mileage include not driving at life-threatening highway speeds can dramatically lower your fuel economy. It maybe fun, but it’s the car that you don’t see that will do the most damage. Gradually increasing your speed will save you precious fuel. And the way gas prices have been, it is nice not having to cram all your money into your gas tank. Extended idling of your engine will lower your miles per gallon.

I hope theses tips allow you to spend more time with your family and friends. As well as save money on gas, and auto maintenance. Enjoy!