Less expensive to run Not as powerful Offer more torque Vehicles powered by diesel more expensive. Vehicles are more reliable because less complicated internally. Vehicles are heavier to build. Vehicles normally last longer. Generally less expensive. Will normally last longer in terms of miles. Engines are generally loud. Emits black smoke when engine is throttled. Fuel is dirtier. Turbo charged diesel will match standard gas engine in terms of power.
Gas
Produce more horsepower Gas engines are more tunable than diesel. Can get better power increases. Less expensive in terms of producing power. Parts are a lot less expensive. Engine doesn't last as long as a diesel because it is less complicated and less heavy internally. Fuel is usually more expensive. Fuel burns cleaner.
Diesel is often thought of as smelly and noisy. Many think that the only place for diesel is in a tractor or a semi, there are many other vehicles that are diesel powered however. Each person must determine what their individual needs are. A person has to do their research before making a purchase of any kind, but especially a large purchase such as a vehicle. You do not want to spend thousands of dollars just to realize later that you made the wrong decision, so take your time and do your research to help you make the best decision for you.
One question that isn't answered here is the emission standards with the black smoke that comes from the diesel engine. The reader is left to wonder if the emission standards are fine or if they are high due to the dirtier burn of diesel. This would be worth investigating. It should also be investigated if noise pollution is a factor with these engines.
When choosing which type of vehicle is what you want you must first determine what your needs are. If what you want is power and tuning options then a gasoline engine is what you are looking for. But if it is power and torque (a force that produces or tends to produce a twisting or turning motion, so in this instance the turning of parts of the motor) that you are looking for then you need a vehicle with a diesel engine. There are certainly plenty of choices out there. Just be sure that you are checking on what your needs are and you will be certain to have the right vehicle for you. Make certain that the vehicle will match your needs and give you the performance necessary to do the job.
Looking at them from a distance both the gas and the diesel engine work in about the same way. A fuel made from refined crude oil is burned inside a cylinder and the hot expanding gasses forces the piston to move. The movement of the piston is then transferred to the wheels through crankshaft, gearbox and transmission.
It's when we look at the engines a little closer that we start to notice that there are differences. Differences in gas mileage, smell, vibrations, price and expected age to name a few.
Ignition System
The gas engine has an ignition system with high voltages, wiring and spark plugs. The diesel does not need this, it compresses the fuel/air mixture until it's so hot it ignites all by itself. In the gas engine it's the spark plug that ignites the fuel-air mixture through a high voltage spark at the right time.
Another thing that separates the diesel from the gas engine is that gas engines adds the fuel vapor to the air in the intake manifold either through a carburetor or through fuel injection nozzles. The air/fuel mixture is then sucked into the cylinder to be burnt the next time the piston strikes.
The diesel on the other hand sucks clean air into the cylinder and then waits for the piston to compress the air as much as it will go. At this time when the air is compressed and hot enough to ignite the fuel, diesel is injected directly into the cylinder (or a small space connected to the cylinder) through high pressure nozzles. The fuel ignites instantly due to the high temperature in the cylinder.
The differences is fuel injection and ignition results in the diesel burning the fuel more efficiently than the gas engine. That's why a diesel has a better gas mileage than it's gas powered counterpart.
This is not to say that a diesel is better. It's different, it has drawbacks too. Diesel engines usually is harder to start in cold and freezing weather. If you remember it was compressed hot air that ignited the fuel. When it's too cold outside the air will never become hot enough to ignite the fuel, and the engine won't run.
Cold Starting a Diesel
To handle this diesels have something called glow plugs for handling cold start situations. Electrical power from the accumulator is used to preheat the glow plugs inside the cylinders before the engine is started. This way the hot glow plugs ignite the fuel when the air is not hot enough to do it. Then when the engine starts it only takes a few seconds for the cylinders to get hot enough to ignite the fuel without help and the glow plugs are not needed again until the next cold start.
This is one of the nuisances of having a diesel in your car. The glowing takes from a couple of second to half a minute and can easily lead to stress when in a hurry. You just have to wait until it's ready or the car won't start. On the other hand if the engine is well done the glowing does not take long and you soon get accustomed to it.
Lets for a second look at the practical differences between the diesel and the gas engine. The diesel is large and loud, it emits black smoke when accelerating and is generally regarded as bad smelling by those not owning one. It also has a sturdier construction due to the higher pressures it must handle and thus can often go twice as many miles as a gas engine during it's lifetime. The sturdier construction also makes it more expensive when first bought.
Features of The Gas Engine
- More quiet that the diesel
- Better acceleration and higher top speed
- Uses an Ignition System with Spark Plugs to Light The Fuel
- Adds fuel to the air before letting it into the cylinder
- Not as sturdy as a diesel. Lower price but breaks down faster
- Gas readily available everywhere
Features of The Diesel Engine
- Loud noise, sounds like a truck or agricultural machine
- Slow acceleration (get one with turbo charger, that helps)
- Lower top speeds but can easily reach the legal speed limit in most places
- Uses glow plugs to help the fuel ignite when the engine is cold
- Lets clean air into the cylinder and injects the fuel later
- Engine is simple and robust. Higher price but runs many miles
- Emits black smoke when loading it (like a quick acceleration)
- Easy to convert to using Eco fuel oils
If I where to give you advice on selecting either a gas or a diesel powered car I would probably tell you this: Get a diesel if you drive long trips and can live with the small nuisances of more noise and poor acceleration, get a gas powered car if you drive less than average or if you just want the comfort at any price.
Both Gregg Hall & Simon Byholm are contributors for EditorialToday. The above articles have been edited for relevancy and timeliness. All write-ups, reviews, tips and guides published by EditorialToday.com and its partners or affiliates are for informational purposes only. They should not be used for any legal or any other type of advice. We do not endorse any author, contributor, writer or article posted by our team.
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