Questions tagged [automotive-design]

The way that the manufacturer of any given vehicle determined to engineer it.

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0answers
27 views

BMW i3 Range-Extended REx exhaust pipe? But where?

I have a similar puzzle regarding: the BMW i3 Range-Extended REx exhaust pipe, where is it? See also, https://www.mybmwi3.com/forum/viewtopic.php?t=197 BMW i3 is an electric car, so the exterior ...
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3answers
50 views

I design custom motorcycle tanks, will the weight of the body filler used offset the balance?

I have done a couple of custom 3D tanks, utilizing body filler mostly, then carving out. I don't use loads of it, but if one side of the tank has the design, can it offset the balance? I just do not ...
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37 views

Hybrid car design: simplifying the gasoline motor

Although in the popular mind a hybrid car is a gasoline car with an electric motor, I imagine that there's some space for simplifying the design of the gasoline motor, once you have the electric once. ...
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1answer
71 views

Re-wiring OBD port

I was reading online about thieves 'hacking' the OBD2 port on push button start vehicles and there seems to be little discussion around OBD2 port locks or moving OBD ports. I was wondering if any has ...
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1answer
76 views

Water in vehicle tyres

Why are some vehicles tires filled with water? What is the reason behind it. Is it done for all the vehicles or only heavy vehicles?
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2answers
30 views

Automobile research [closed]

I am looking for a project in field of automobile engineering.So if any one can suggest what are the areas in which there is scope for development/improvement in automobiles
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3answers
5k views

How do the latest automatic transmissions match the efficiencies of manual gearboxes?

Most people know that for old or even somewhat old cars, manual transmissions are more efficient. Recently automatic cars have become almost as efficient or even as efficient as manuals. I was ...
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2answers
216 views

Is it possible to have a car without direct control of the wheels?

Would it be safe and legal to design a car which uses only power steering and where the steering wheel doesn't have a direct mechanical effect on the wheels? I say that because If i was Elon Musk, I ...
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2answers
92 views

Different distance between the end of the front fender and the beginning of the front door on FWD and RWD cards

Why the distance between the end of the front fender and the starting point of the front door of a vehicle is different in RWD and FWD cars? I am talking about the gap marked with red in this pic: ...
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0answers
106 views

Why is rain not a consideration for sedans' rear windows?

I recently bought a new car and was very surprised to find that it has no rear windscreen wiper. On further investigation, I discovered that in general, car manufacturers only include rear wipers on ...
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3answers
1k views

Why do Formula 1/Indy cars use high profile tires?

I apologise for this being slightly off-topic for the stack, but it seemed the best stack for the job. Aesthetically speaking, larger rims are preferred these days -I recently bought a Porsche with ...
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3answers
2k views

Why is the roll center of the car suspension designed lower than the car's cg?

Why is the car roll center always designed to be lower than the car's center of gravity In my humble opinion, despite the fact that the car suspension will be harder to install and that there will be ...
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78 views

Is there any advantages of the mounting side (left or right) of the motor in a FWD vehicle?

Almost every FWD I have dealt with has the engine on the left side and the transmission on the right. Hondas with the D17 Engine has it the opposite which made me curious. Does the mounting side of ...
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1answer
677 views

Design of a double A-arm suspension

Can a double A-arm suspension have its arms bent as shown in the sketch below? The sketch is taken to be viewed from the the front.
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1answer
2k views

Automotive engine compartment parts and connection diagram

Is there is a site that can show me the complete engine compartment part locations and connections? I need a site that can show me the same that the auto parts store have, that once you input the car ...
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1answer
1k views

Position of brake calipers different between wheels

I noticed when looking at a Porsche 918 the other day that the brake calipers are not the same position on the front wheels as the rear ones. I then noticed that they are laid out the same on a BMW M3....
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2answers
1k views

How do seat belts function?

How do belts function (work)? A diagram could be useful and a description of how seat belts function. How do you pull the belt? How do you buckle the belt properly?
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2answers
3k views

Cast or Forged Wheels, is there any real-world difference?

One-piece alloy wheels can be either cast, or forged and milled from a billet. The latter process supposedly makes for a slightly denser and stronger structure and eliminates any bubbles that may have ...
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3answers
53 views

Redundent radiator

A 2000 town car limo was build just in tolerance for the 4.6 engine capability. Even at brand new it would overheat if you push it to hard. It is older and less efficient and it over heat in general ...
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1answer
9k views

Automatic Transmission RPM changes from 1st to 2nd gear

So this is a Corolla 2005 model, with an automatic transmission. I am just curious about how my car works. If I increase my RPM when I am in 1st gear, to say about 3k (by aggressively pressing down ...
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2answers
25k views

Oil Cooled vs Water Cooled

These both are cooling mechanisms. One uses oil to cool whereas other uses some kind of water-based coolant. What are advantages and disadvantages of both in both technical and ownership point of view?...
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2answers
2k views

Why do vehicles handle better with heavy loads? [closed]

Inspired by comments here: I'm not the only one who has experienced an improvement in ride and road-feel with a heavily-laden vehicle. I'm recalling a long drive I made a decade ago in my otherwise ...
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3answers
2k views

How did luxury cars provide smoother rides without active suspensions?

It seems all luxury cars have active suspensions now, so it's not a fair comparison to "non-active" cars. But I was recently driving a mid-2000 Mercedes E-class over the same roads I normally travel ...
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1answer
43 views

Where do you go to find illustrations of car parts?

I am trying to learn more about car engines but for the life if me can't find good illustrations of how some of them look (specifically a 2013 Nissan Juke) where do you go to get information and ...
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1answer
90 views

Designing IC engine [closed]

I am trying to design a theoretical internal combustion (IC) engine. The ultimate goal is to achieve 3000 hp with this engine, for which I know I will need low bore x stroke ratio, high compression, ...
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6answers
8k views

Why is the speed of a motorcycle measured at the front wheel?

I have been thinking about this, from quite long ago. Why is speed always calculated from the front wheel? Let's just consider the following situation:- You are in a race, and you have given full ...
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1answer
935 views

Why do modern vehicles omit a temperature gauge?

I'm more specifically interested in performance vehicles. My current car has gauges for coolant temperature, oil temperature and oil pressure. The coolant temperature gauge is there so you can tell ...
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2answers
10k views

Keep Alive Memory (KAM)

What is "Keep Alive Memory" (KAM) and how is it different from RAM? From what I read over the internet, it is kept alive even after the ignition is OFF, but isn't that what a ROM is supposed to do?
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2answers
4k views

How does a transfer case split power between front/rear?

I've read somewhere that transfer cases (on 4x4 vehicles) split the power from front to rear, but don't do it equally. Something along a 60% rear/40% front (though I'm sure it could be any percentage ...
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3answers
3k views

Location of exhaust manifold

In four cylinder engines, why are some cars designed with the exhaust manifold towards the front of the car while other cars have it towards the back? Is there any advantage in one design over the ...
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1answer
882 views

What is a sprag unit and what does it do?

I know a sprag unit is used in the transmission. What is it and how does it work? Is it used anywhere else or is it strictly a thing used in transmissions? Are there different kinds of sprags?
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1answer
895 views

What is Lobe Separation Angle (LSA)?

What is Lobe Separation Angle (LSA) and how is it used in camshaft design? How is it measured? What difference does a long or short LSA make?
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1answer
77 views

charge socket on a Fuel Cell car

I was looking into Toyota Mirai and Huyndai Tuscon Fuel Cell cars and thought to myself wouldn't it be great if I can charge a car when there is not enough juice to make it to the nearest hydrogen ...
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1answer
3k views

What is a stress riser?

What is a stress riser and why is it important to avoid them during engine construction or rebuild?
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2answers
916 views

Synchromesh, Helical gear design

What specifically, is the design principle behind the Helical shape of gears in a synchromesh transmission? Are the Helical gear designed, in any known vehicle, to disengage? Is that why the gears ...
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2answers
3k views

Does Mazda's Skyactiv-G engine avoid EGR altogether?

It looks like Mazda sees high compression-ratio engines as the way forward to boost fuel economy and specific power on their midsize gasoline engine lineup (13:1 is an impressive achievement). ...
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2answers
2k views

Why is martensitic steel used instead of grey cast iron for ATV disc brakes?

Grey cast iron has better thermal properties -- conductivity and specific heat -- lower density, better castability, and better friction than martensitic stainless steel. Why are OEM parts made of ...
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4answers
10k views

Designing an Ackermann steering mechanism

I'm designing a car with an Ackermann steering mechanism. According to everything I have read about Ackermann steering, if I set up my steering mechanism like this: ... then I should get behaviour ...
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2answers
99 views

Car with floor-integrated battery pack

Are there any other electric cars with a floor-integrated battery pack other than the Tesla?
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2answers
3k views

What are reverse lights used for besides showing intention to reverse?

Recently I have noticed cars in parking lots with their reverse lights on even when the driver is not behind the wheel. I stop to let the drivers back out, and then realize they have no such intention....
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1answer
209 views

Speedometer dial ranges

I was talking to my son today about a random theory of a friend of mine. His theory was that speedometers are typically set so that 12 o' clock is the optimal speed for freeway driving in that ...
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4answers
1k views

Why is there no vent option for combined defrost/face?

I've wondered about this one question for the better part of twenty years: why is there no option for you to set the air vent to split between face and defrost? That is, the airflow options on (...
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3answers
7k views

What determines when an automatic transmission shifts?

I'm working on developing an automatic bicycle (mostly microcontroller based) and I'd presume I'd be shifting in a similar way to a car. So my question is, what factors does the transmission take into ...
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1answer
289 views

Why is the antenna on the Mazda5 off-center?

Does anyone know why the antenna on the Mazda5 is not centered on the back of the vehicle?
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1answer
28 views

Is it possible to buy advance monitoring sensors for a normal car?

I was wondering if it is possible to buy some advance monitoring system and implement in a normal car. Monitoring systems like collision avoidance sensor, parking sensor, lane detector, and many more ...
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5answers
15k views

What are the problems in building 2 stroke engines with a large displacement?

I understand (from preliminary research) that when engine gets bigger, with a higher displacement that it is practically not possible to have a two stroke engine. What are the implications in ...
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4answers
43k views

Effects and factors of wheelbase in the design of a motor vehicle

How does varying wheelbase during automobile design affect the properties of the vehicle that is going to be built (both two-wheelers and four-wheelers)? I know that greater wheelbase means less ...
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3answers
377k views

what is difference between DOHC and SOHC?

I want to know the SOHC and DOHC configurations. On what factors an engine manufacturer decides to go with SOHC or with DOHC, what should I choose? DOHC or SOHC?
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6answers
46k views

1 Piece versus 2 Piece Drive Shaft

A guy on a Nissan forum asked why he should keep his 2 piece drive shaft in his truck instead of changing over to a 1 piece version. This was the answer I gave him: The 2 piece drive shaft (DS) is ...