People often complain about diesel engines, especially when they don’t have all the information.
But what they don’t realize is that a lot of those complaints are based on outdated or false information.
Misconceptions about diesel engines have a tendency to run wild, but we’re here to set the record straight.
In this post, we’re tackling some of the most common misconceptions about diesel engines. From fuel economy to environmental impact, we’re debunking five myths we hear all the time.
Myth #1: Diesel Engines Have Poor Fuel Economy
This is one of those misconceptions that is plainly not true. You’ll likely find when you’re shopping for a new vehicle that diesel engines actually have great fuel mileage.
They actually tend to get 20-30 percent further on a gallon of fuel than similarly performing gasoline engines. With turbo-diesel, you’ll likely see about 25 percent better fuel efficiency.
The Reason For Better Fuel Economy in Diesel Engines
Two factors contribute to better fuel economy: the differences between gasoline and diesel fuel and the differences between gasoline and diesel engines.
When we look at the two fuels, you’ll see that one has more energy per gallon of fuel. Looking at the calorie content of a gallon of gasoline vs. a gallon of diesel shows that diesel has far more calories.
Gasoline has about 31,000 calories, where diesel fuel has closer to 35,000 calories. And more calories means more energy.
Similarly, diesel engines have a longer compression stroke, which creates more torque than their gasoline counterparts.
Myth #2: Diesel Vehicles are More Expensive to Maintain
Diesel engines are known for longevity and durability. The initial cost of a diesel engine might turn some people away, however.
But, according to research done by the University of Michigan Transportation Research Institute, you’ll actually end up saving about 27% on fuel costs over the life of your diesel engine when compared to gasoline equivalents.
And, a diesel pickup tends to have about 70% higher resale value compared to a similar gasoline vehicle.
Diesel engines tend to fail less frequently than gasoline engines, saving you on repair costs and downtime.
Myth #3: Diesel Engines Struggle to Start in the Winter
It’s true that gasoline has a much easier time igniting in freezing temperatures than diesel, but this doesn’t mean that diesel can’t start in the cold.
Fortunately, modern technology has assisted in making cold-starts much more effective than ever before.
A block heater is one such essential invention. These help to keep the engine block warm when it’s turned off. This, combined with a glow plug, makes starting your diesel engine in the winter much less of a problem.
The cold can also drain your battery. A worn battery might affect the function of the glow plugs, as it supplies them with energy.
To help with this, it’s useful to invest in a battery warmer.
A few preventative measures can help you avoid start problems in the winter:
- Keep the glow plugs and glow plug relay in check
- Buy a battery warmer
- Keep your battery healthy
- Check that the grid heater is functioning properly
Myth #4: Diesel Engines Perform Poorly at High Elevations
Some people believe that high altitudes negatively impact diesel fuel efficiency, because of the thinner air.
In reality, though, it’s the efficiency of gasoline engines that suffers.
Because the fuel-to-air ratios are very precise in gasoline engines, the thinner air means less fuel is added to maintain the proper ratio. This affects performance.
A diesel engine doesn’t need the same precise ratio, and can still function just as well. And, because they pull more air and fuel into the combustion chamber, they deliver a higher power output.
Myth #5: Diesel Engines are Worse For the Environment Than Gasoline Engines
A lot of people believe that diesel engines are dirty and bad for the environment. This comes from the fact that you can see the emissions leaving the exhaust.
While diesel engines do emit some nitrogen compounds, because of EPA regulations, newer engines actually cause a lower amount when compared to gasoline engines.
Recent technology upgrades, as well as EPA requirements, mean diesel engines have a much cleaner output and lower overall emissions. We’re seeing that engine models from 2007 and on have advanced systems to reduce the output.
These advanced systems can actually reduce emissions up to 90%. You can also see a reduction of 25-50% in nitrogen compounds, according to the US Energy Information Administration.
HHP is Here to Help!
Overall a diesel engine isn’t as problematic as some people would have you think. And we’re here to help keep yours running great!
If you need parts for your diesel engine, HHP has you covered. We carry a wide range of parts for many different engine applications.
Our ASE Certified Technicians can help answer your questions and help find the right parts to get the job done right.
From diagnosis through delivery, we’re Highway & Heavy Parts!
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