All Questions
Tagged with automotive-engineering engines
20
questions
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1
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35
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How to calculate clearance volume in internal combustion engine of a tractor?
To begin with, a tractor engine is provided to identify and calculate the terminologies associated with it. The bore diameter and stroke length is given as 15.84 cm and 8 cm respectively. Having ...
0
votes
1
answer
35
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Diesel vs petrol NOx / PM?
I am interested in the comparison of NOx and particulate matte (PM) for modern (Euro 6) diesel engines vs petrol engines? Are the exhaust products produced by both equally carcinogenic?
- 239
10
votes
7
answers
9k
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Why are bulldozers so slow?
Tracked-type tractors and bulldozers are very slow engineering vehicles. Their top speed is less than 15 km/h and when pushing it is even lower (< 5 km/h). For example: the Caterpillar D9's top ...
- 235
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votes
4
answers
2k
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Throttle position as a function of engine torque and speed
In the figure attached showing the throttle position versus an IC engine produced torque, I didn't understand why does the torque value at a specific rpm vary for different throttle positions. My ...
- 50
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2
answers
355
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Wheel's torque and differential gearbox
I know that the differential gearbox is providing a torque to the wheels; as the relation in the figure indicates : Tw (wheel torque) = Td (differential torque) × (ηd×nd). Where nd:is the differential ...
- 50
-1
votes
4
answers
70
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Shifting Between Gears To Achieve Higher Acceleration
If the car's acceleration is higher when the wheel's angular acceleration is higher(tangential acceleration=alpha x radius). Why are higher gears not used to accomplish the acceleration of the car ...
- 50
0
votes
1
answer
35
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How to sense off-idle in internal combustion engine?
What is the simplest way to sense off-idle in an internal combustion engine? I am currently focusing on roadgoing and tractor, but would like as general-case a solution as possible. Priority is on ...
0
votes
2
answers
157
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What are the benefits of reducing valve duration in an engine?
From my understanding this would be beneficial if you've taken a stock engine and put a smaller, more restrictive air intake on it.
It would also be done to create more low end torque which shifts the ...
- 91
14
votes
8
answers
6k
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Is there a reason (in terms of the physics involved) why it is better to push start a car in 2nd gear rather than 1st?
I am struggling to understand why it is recommended to push start a car in 2nd gear rather than 1st - in terms of the physics involved, I fail to see a reason why this would be the case. I have ...
- 355
2
votes
3
answers
83
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Why do custom engines typically specify a type like "Ford" or "Chevy"?
I notice that when custom car engines are sold they nearly always have a big name type name like "Ford" or "Chevy". Is this because the block and crankshaft comes from those companies and the custom ...
- 1,635
2
votes
1
answer
176
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Effect of Pressure on Combustion efficiency (of hydrogen) in excess air
Can somebody explain relation between combustion efficiency and pressure in lean mixtures using any kind of chart or mathematical equations?
At first glance I thought, combustion efficiency increases ...
- 187
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1
answer
81
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What are the non-practical features of a sterling engine that cause the internal combustion engine to be used instead?
What are the non-practical features of a sterling engine that cause the internal combustion engine to be used instead (in a car)? (e.g. price, size, the power to weight ratio, etc.)
Can you name any ...
- 31
0
votes
0
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31
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PLEASE ANSWER Sterling vs Combustion Engine
This may be difficult to answer but, theoretically, if you had a car with a sterling engine that produces say approximately 300 horsepower how much of any specific heat source would need to be used if ...
- 31
3
votes
3
answers
4k
views
Manual transmission: Why downshifting is less smooth than shifting up?
Today while driving I had to make a quick shift to a lower gear that was not as smooth as it should've been. I've been taught that while shifting to a lower gear you have to be more careful when ...
- 2,269
0
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Why aren't modern pistons circular?
I'm trying to make most of an engine from scratch (cylinder, crank case, piston). I've been reading about pistons and I've learned that many modern pistons are cam ground--slightly elliptical in shape ...
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