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3
votes
2answers
25 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?
11
votes
1answer
102 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 ...
9
votes
3answers
241 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 ...
6
votes
1answer
42 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?
8
votes
1answer
67 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?
1
vote
1answer
53 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 ...
3
votes
1answer
171 views

What is a stress riser?

What is a stress riser and why is it important to avoid them during engine construction or rebuild?
4
votes
2answers
307 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 ...
2
votes
1answer
379 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). ...
3
votes
2answers
243 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 ...
4
votes
2answers
841 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 ...
0
votes
2answers
51 views

Car with floor-integrated battery pack

Are there any other electric cars with a floor-integrated battery pack other than the Tesla?
7
votes
2answers
1k 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 ...
1
vote
1answer
93 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 ...
3
votes
3answers
268 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 ...
6
votes
3answers
2k 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 ...
1
vote
1answer
125 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?
2
votes
1answer
23 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 ...
2
votes
4answers
2k 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 ...
2
votes
3answers
7k 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 ...
13
votes
4answers
27k 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?
5
votes
4answers
9k 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) ...