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51

Torque is the name of the game. High torque is needed to move heavy loads. If comparing a gasoline engine to a comparable diesel engine the diesel will always have higher torque. The higher torque comes from the need for a higher compressing ratio needed for compression ignition. To achieve the higher compression ratio a longer stroke is required. The longer ...


23

A major, but often overlooked, reason for the dominance of gasoline engines in passenger vehicles is the need for diesel engines in heavy vehicles. A given quantity of crude oil, depending on its composition, will yield a given quantity of diesel, a given quantity of gasoline, a given quantity of candle wax, and specific given quantities of other petroleum ...


20

To OP’s main question: “Why do heavy vehicles almost always use diesel engines?” Answer: Cost and dependability. Diesel engines are significantly more expensive, but have lifetimes many times greater than gasoline engines. For a commercial vehicle that is on the road all day every day, it adds up to big savings because of the better fuel efficiency and less ...


20

They are often times referred to as service loops. Their purpose is to allow some flexibility in the event the master cylinder has to be replaced, or a fitting needs to be repaired. It makes it easier to align the fittings without crossthreading them. AS @Fred Wilson has stated there is flexing. The brakelines will typically be anchored to the frame. The ...


18

It is about vibration. The master cylinder and brake booster are mounted to the firewall; the firewall flexes. They move up and down significantly as the body jerks up and down when driven over bumps. This solution is cheaper to implement than changes to the firewall. It would be challenging to build a firewall rigid enough to support that weight.


11

Given two engines of similar weight, both operated at their respective optimum efficiency (i.e. maximum mechanical work done per unit of chemical enthalpy in the burnt fuel), you will end up with similar fuel consumption for either engine type. But a Diesel engine will generally offer slightly more power out of this, by giving more torque; that's how it's ...


10

They provide the driver with coverage of two significant blind spots. Especially in cities, there are numerous accidents with cyclists, pedestrians or even small cars being in that blind spot and being hit. These mirrors allow the driver to cover those blind spots and be sure no one is there before he begins a manoeuvre. Safety legislation in Europe may be ...


9

What you see could very well be burned coolant as well as oil. As the glycerin burns in the combustion process it can take on corrosive properties that degrade the electrodes. Typically with oil in the combustion chamber you don't see as sever of a an electrode degradation as illustrated in your photos. I think your head gasket change is looming and ...


9

As @MooseLucifer said in the comment, these deflector strips are generally there for air deflection. They do two things - one, they change the air pressure under the car helping stability at speed, and two, they (sometimes) help divert airflow up to the radiator. In my experience, you always end up leaving it somewhere in the woods by accident.


9

Factory specs assume factory parts. Each modification you have made changes the angles at which the suspension operates so those angles no longer apply. This is especially true on truck lifts where a large amount of the suspension is replaced. Here is a nice tire rack information write up (or read below): https://www.tirerack.com/tires/tiretech/techpage.jsp?...


8

Your truck is designed to carry that load. If you consider carrying a full set of passengers. 1 in the front, 3 in the back, that weight would exceed your current load of 500 pounds. I would not be concerned at all regarding doing on what you plan on doing. In fact, make it 1,000 pounds and do it, your truck would handle that just fine although it may ...


8

The shop vac can barely run because of the back pressure when hooked up the the tailpipe. If there is a severe exhaust restriction it could explain the presence of fumes in the cabin: if the engine is running the exhaust gases have to escape from somewhere, regardless of whether the exhaust is free-flowing or not. If your vehicle employs an EGR setup that ...


8

This is the access port for the tire iron so you can lower the spare tire from under the truck. Look at your Owner's Manual under "Vehicle Care," it will show you where on the truck to find your tire changing tool kit and how to use it to lower the spare tire.


7

Would there be a substantial enough of a horsepower boost to be noticeable? The most you could see from such a modification is 15hp. This would not be enough for the seat dyno to register, unless there are plenty of hemorrhoids to detect it. More then likely you'd see a measly 5-10hp, and then only at the higher RPM levels would this be apparent. You would ...


6

For a really quick solution, try getting hold of a spare seatbelt from a scrap vehicle (I doubt the shape changes often, so I expect any reasonably recent Toyota would do, just get one that is the same as the belts in your car). Remove the tongue (The t shaped bit) from the belt, and keep it to hand - then, when you're driving on the trails and want to ...


6

I plowed with a Chevy 1500 and a Ford F250. You could definitely feel the weight of the plow more on the smaller 1500 compared to the F250. The 1500 would squat quite a bit when the plow was lifted. The plow (a Western brand) was professionally installed on both trucks, and the only issues we ever had were electrical with the plow controls, the same kind of ...


6

If the dump box gets pushed on by a truck or an end loader or whatever, it can cause damage to the box, possibly not even allowing it to dump again. The rear door, while seeming stable to you and me, would be at the mercy of an end loader or bulldozer. Some might want to push the box to get the truck to move, such as if it got stuck or needed a little extra "...


6

When sizing springs for a particular application, manufacturers have to get the right physical size for the job, but they also need to worry about the "spring rate" to properly support a given load. The spring rate is basically how much weight it takes to compress the spring. A larger engine is going to be a bigger static load for the suspension, and a ...


6

The issue most likely is, the trailer was empty. The brakes are designed to work well when the trailer is full. As you can imagine, if the dump was full of loose gravel there'd be quite a load in it. When the trailer is empty, the same amount of force on the brake pedal can cause the brakes to lock up easily. This is something more for the driver to worry ...


6

The more air allowed under a vehicle the greater affect this air will have on fuel economy. The lowered front air deflector will reduce the amount of air and thereby improve fuel economy. The large over the road trucks have several new air types added in recent years for the same reason. The most noticeable has been the long skirts under the trailers.


6

Seeing as how the vehicle is over 20 years old, I'm doubting you are getting outgassing. That should have occurred a long time ago. If you drive with the window open to ensure fresh air flow, does the headache still occur? Maybe you just have a psychosomatic reason and your head just starts hurting because deep down you hate the truck (really just kidding ...


5

If it was never converted to use R134a instead of R12, you're not just going to be able to charge it up yourself, since something that old probably came from the factory with R12 refrigerant. You need a license to buy R12 in the United States, and it's not cheap. Since your system is compromised and needs attention anyway, you might as well do the R134a ...


5

The ISO 1728 document is not public, but I think that it does not specify threads in the palm couplings. It will be different between regions. For Europe, the palm couplings use either a M16×1.5 or M22×1.5 female thread (example, example). Compressed air couplings with a European standard industrial profile of the plugs and a M16×1.5 male thread are ...


5

This is not a very easy topic. You are going to want to figure this stuff out for yourself and then do some testing to verify your design assumptions work the way you think they will. For the max steering angle you should be able to get that from different tractor manufacturers. Frankly if it were me, I'd be grabbing a tape measure, a set of old skool ...


5

Whoa. Your 1988 F150 is TOTALLY NOT set up to run "flex fuel" E85. Please, don't do that. Just don't. Basically you are suggesting running your vehicle on 85% moonshine. Truth is, due to some hygroscopic stuff and regulatory nonsense, it might only be 75% alcohol. ETOH, ethyl alcohol, ethanol, moonshine, flex fuel, corn fuel, boogie juice. Whatever ...


5

That light indicates the Exhaust Brake feature is active and will work to slow the vehicle when your foot is taken off the accelerator. The picture is meant to be a throttle plate in the closed position (the horizontal line with the dot in the middle) and air being stopped by the plate (the vertical lines). Here is a question on another site that describes ...


4

As@ mac has stated a plow will fit and the truck will push snow. The primary considerations are how often and how long are you going to plow. The longer and more frequently you plow the more the suspension and driveline parts will be stressed. If you are just doing a few driveways you should have no problems. If you plan to plow commercially for long ...


4

It's impossible to give a definitive answer here as to what was done with your truck. However, it is often stated that when larger wheels and tires are fitted to a truck, the brakes should be upgraded. This is due to the larger rotational inertia of the larger wheels and tires, which can make the vehicle significantly harder to stop. Therefore, if the ...


4

I essentially gave up and took it to a mechanic. The fuel pump was dead. What happened was my fuel pump was dying. It was providing around 5psi of pressure when it needed around 9-14psi. Overall, I had the mechanic replace the pump & regulator and the truck is working normally again. I had some codes on my computer for the EGR system and the MAP sensor. ...


4

Here is some information from the Trucker Report. Gottlieb Daimler invented “vehicle no. 42” in 1896. Many truck enthusiasts cite “vehicle no. 42,” a horseless wagon, as the first truck. Daimler’s invention had a 4 horsepower, 1.1 liter, 2 cylinder engine that supposedly hauled 3,300 pounds. Skeptics believe that Daimler over-exaggerated the payload ...


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