Questions tagged [automotive-engineering]

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Cooling system design of a heavy duty truck

I'm looking for information pertaining to the design of an engine cooling system in a heavy duty truck -- one that's used for long haul shipping. I've found some resources that provide details on the ...
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Using XFoil to generate data for various Mach numbers

I am attempting to use XFoil to generate a list of coefficients of a given airfoil at a range of speeds. The first issue I faced is that it appears with XFoil, you give it a Reynolds number (which ...
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How far have we developed eco-friendly tyres alternatives?

Considering how bad rubber tires is for environment (Microplastic on tyre - NatGeo), Today tires consist of about 19 percent natural rubber and 24 percent synthetic rubber, which is a plastic polymer....
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41 views

How much should I adjust torque specs for lubricated threads?

The factory manuals for motor vehicles give torque specs for most nuts & bolts. My (possibly incorrect) assumption is that these are for dry threads as would be used in a factory where no oils or ...
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23 views

Problem in the inverse kinematic model of a car like vehicle?

I'm a electrical engineering student and i am building a simulation of a car like vehicle . As I understand it: The input for the forward kinematic model are the control variables and the output is ...
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1answer
43 views

How to control a mechanical part using a button(on/off) on a motorcycle?

I don't know how to correctly write the question. I have no background knowledge of electronics engineering. I was wondering for instance, How to open and close the Motorcycle Stand using the On/Off ...
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31 views

Frictionless Braking System for 2 wheeler using electromagnet [closed]

I'm developing a Frictionless Braking System for 2 wheeler using electromagnet. My questions were How can we overcome the problem of braking at Low speeds. This type of braking tends to fail. How can ...
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42 views

What mechanism do safety belts use to engage?

Earlier today I came across a creep testing machine that uses a safety belt as a mechanism for stopping loads from hitting the ground. It is probably the first time I saw a safety belt roll outside of ...
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2answers
514 views

Is it possible to build an efficient Electric Vehicle engine with minimal to no computing control systems?

First of all, I am neither an electronic nor a mechanical engineer, so if some of what I say sounds ignorant, that's most likely because it is. I have been thinking about this for a while now. I love ...
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1answer
42 views

Work calculation in a thermodynamics cycle process

To calculate work in a cyclic process (say Carnot cycle) we find area under p-v curve,or use net heat transfer= net work done. Why won't we simply add work calculated in each process of a cycle,like ...
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23 views

High articulation joints

Looking for advice or suggestions for high articulation joints (>57°) for an automotive halfshaft. Peak operating conditions are in the ballpark of ~1000RPM, ~300ft-lb torque. I've considered u-...
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1answer
32 views

Position of Gyroscope on rigid body

Does the position of a Gyroscope effect the sensor's reading? for example if I place a gyroscope at the centre of gravity of body and another at one corner, will the angle measurements be different ...
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1answer
33 views

What forces to consider on a tracked vehicle?

I'm aware that when calculating the power necessary to move a wheeled vehicle I should consider the rolling resistance, gradient resistance, air resistance and if it's a stopped vehicle the ...
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Is it practical to increase engine efficiency by preheating petrol from engine heat waste ? is it applied in any automobile?

I found some article related to preheating the fuel to increase fuel efficiency, but I rarely see such implementation, I assume that it's less effective compared to others But is it really possible ...
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1answer
28 views

Drum-brake self-adjusters

I was reading about Automotive Brakes (Chapter 52, Automotive Mechanics by William H Crouse, Donald L Anglin, 10th edition). And in a section about drum-brake self-adjusters, it is said that the ...
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1answer
24 views

How to log turbocharger's compressor flow data?

A turbocharger's compressor map has a graph with Pressure Ratio on the y axis and Compressor Flow (lbs/min) on the x axis. The pressure ratio can be measured using absolute pressure sensors located on ...
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15 views

Typical dirt bike clutches - is there a norm?

I have several of the typical 49cc 2 stroke engines used for dirt bikes. They all have the same type of centrifugal clutch. Recently I have ordered a Honda GX-35 (4 stroke) engine and - what a ...
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1answer
58 views

Throttle vs Choke vs Damper vs Valve?

Throttles, chokes, dampers, and valves all restrict fluid flow. Aside from specific terminology/usage in internal combustion engines, are these really interchangeable terms, or do they have some ...
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3answers
90 views

Are stuffing box still relevant?

Three problems: Internal friction due to stuffing materials. - Why does it not matter? If it does then there must be some limits like rpm etc. Not entirely leak proof. - Why are we supposed to keep ...
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1answer
34 views

Long term engine issues by using Active Exhaust?

Looking to install OEM active valve mufflers on my 2019 Mustang EcoBoost. Wondering if the valves opening and closing, thus changing exhaust back-pressure would cause the engine to run lean/rich and ...
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36 views

Can You Identify This Deep Groove Ball Baring Bearing and/or Give an SKF Equivalent?

I am changing out my motorcycle engine bearings from the Chinese CJB brand to a high quality brand like SKF (Explorer range). I am still waiting on a heat gun in order to remove the bearings from the ...
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1answer
41 views

Purpose of a GD-Zn alloy

Here are screenshots of the data-sheets of two separate products for a reference. They both are nickel plated, used for coupling nuts. The former is shielded, the latter is not, I wonder if this is ...
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40 views

How come my calculated engine torque is so much less than the manufacturer's specifications?

Here are my calculations. Am I doing anything wrong?
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1answer
43 views

How do automotive engineers determine the manufacturer rated towing capacity?

My layman’s understanding is that the limiting factors for towing capacity are usually the brakes, engine work capacity, and the transmissions ability to handle the prolonged torque without ...
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2answers
46 views

Do the tubes of an automotive radiator flow in parallel or series?

The radiator in my car is damaged. One tube has a severe gash in it. I need to drive the car about 100 km before I can get a replacement radiator installed and coolant drains too fast to reasonably ...
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45 views

Is sitting on a double-decker bus's upper deck more hazardous than sitting on its lower deck?

Many people online allege feeling more 'wobbly' or 'unstable' while seated on the upper deck, than on the lower, and that in an accident, sitters on upper floors are more likely to be ejected out ...
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1answer
34 views

Calculating final drive force from engine torque and tyre spin ratio

Trying to build a simplified physics simulation for cars, along the lines of "Car Physics" by Marco Monster. I'm stuck at straight line acceleration. I don't know if I understand the ...
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3answers
31 views

Car MPG during lean economic times

So lean times are upon us, and I started paying more attention to my car's onboard computer saying what the MPG is. I have a couple of questions... Does engine braking really save fuel? The car states ...
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1answer
80 views

What signals are expected on the connectors for this 12V Volkswagen Scirroco wiper motor circuit

EDIT: added a picture of a very similar unit. I picked up a used VW rear? wiper motor that I want to use for a simple motion experiment. Having no idea how to power the thing I popped open the case ...
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1answer
32 views

Petrol engine vs diesel engine [closed]

I am a student of mechanical Engineering in Pakistan.I am facing difficulty so I want to know the basic difference between diesel and petrol engine. Any help will be highly appreciated
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1answer
33 views

Relation between Inlet and Outlet mass flow rate for a turbocharger?

For the compressor maps for automotive turbochargers, the Corrected mass flow rate (at inlet) is given as abscissa. However, I wish to know the mass flow rate at the outlet. What is the relation in ...
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28 views

When calculating a car's suspension caster, after turning the steering wheel 20 degrees, why multiply by 1.5?

To calculate caster of one side of a vehicle, the steering wheel is turned 20 degrees to the left, and the camber is obtained; this represents the 'in' value of the front right tire. Then the steering ...
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1answer
44 views

What's so special about Tesla's all-electric automobiles, compared to other car manufacturers'?

Why haven't car manufacturers caught up with Tesla's automobiles? E.g. why haven't the Chevy Bolt, Nissan Leaf, VW e-Golf driven (pun intended) TSLA out of business? I list TSLA's advantages that don'...
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65 views

Why aren't American cars as popular worldwide as e.g. Japanese cars? [closed]

I heard that the Japanese reverse-engineered American ones and produced them cheaper but I don't know the engineering/business reasons behind the phenomenon.
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1answer
26 views

Lock axial movement on key joint

I have a motor which its output shaft has a key, and it will be connected to a wheel/tyre. I'm wondering how can I lock the hub axially, so there is no way it can move freely along the axis, which ...
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2answers
29 views

Cybertruck Monocoque body design

For those of you who are following the development of the Cybertruck, the latest modification is a size reduction of the body by 3%. Assuming this is dimensionally and not by volume, do you think this ...
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43 views

Soapbox - GoKart material - Bamboo or steel?

I am building a soapbox (go kart) and I am planing on what materials I could use for the frame and the chassis. I have thought about using bamboo or steel. Steel is normally the go to material when ...
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1answer
28 views

Why don't car manufacturer's use a combination of disc brakes and electeomagnetic brakes to reduce braking distances?

It many be due to costs or that the brake discs would have to be made out of aluminium/copper for the electromagnetic braking to be effective or there may not be a significant reduction in braking ...
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1answer
19 views

What is the maximum speed per hours or miles per hour i will be able to hit on a straight? Read description, please help

I have a go kart project and this is what I'm trying to do. The kart also has 28-8 tires in the back.I have a 6.5hp motor that can run at max torque at 2500rpm. I need it to move 400 to 500 pounds. ...
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53 views

Why do race cars — such as Formula 1 cars — use two brake master cylinders?

In Derek Seward's Race Car Design and in some of the videos on race car braking systems, such as this one, it is mentioned the use of two master cylinders, one for the front brakes and one for the ...
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How can I learn the standards(EN,ANSI,ISO) which is related to “roller hemming method in automotive industry”?

There is a method using in automotive industry which is called roller hemming. I have a project about this method but before beginning the project I need to learn the standards(EN,ANSI or ISO) which ...
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2answers
52 views

How do automotive engines differ for longitudinal vs. transverse applications?

Sometimes engines are described as being intended for a particular orientation, e.g., "The 4.6 L; 278.6 cu in (4,565 cc) LD8 (VIN "Y") is a transverse V8 for front-wheel drive cars." What exactly does ...
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100 views

Why automakers are/should be making medical ventilators?

I am not very familiar with the mechanics of neither a car nor a medical ventilator. Considering global coronavirus pandemic and shortage of medical ventilators in many countries, I saw some news ...
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45 views

Car seats mounting requirements

Does anyone know the required strength of the mounting points of a car seat? I'm working on a new sliding mechanism and don't want to damage the integrity of the seat mounting. "Child seats" have ...
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0answers
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Determining the threshold condition of an ABS brake system

In an ABS system there are sensors on each of the wheels which determine the angular velocity in order to pulse the brake of an individual wheel which registers a diverging reading indicating brake ...
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1answer
29 views

Problem for backwards moving vehicle in hills

The vehicle running at Hill station.. Same time vehicle moves back ward direction in manual transmission system. So avoid the problem.. I think ratchet pinion mechanism suitable! or not?
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1answer
21 views

How a turbo jet engine produces thrust

As i read on some website of nasa, that velocity of the gas flowing from nozzle of the jet is responsible for thrust, But ky confusion is that, as the velocity increases presure should drop at nozzle, ...
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57 views

Compressed Air Engine

Is there any efficient way of using a large volume but low pressure (<2 bar) stored compressed air, either to drive an engine or some other application?
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37 views

Complete Similarities

Regarding the similarities, I know that the complete similarity is not always possible because all geometric, kinematic, dynamic similarity can not be met simultaneously. Is it because both ...
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46 views

By approximately what ratio does power steering (on a car) amplify the torque applied?

Power steering on a car is a form of torque amplifier: the driver applies X Nm (or ftLb) of torque, and the power steering adds Y torque - but maintaining the same angle of turn. But what's the ...

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