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Questions tagged [theory]

Use this tag when the question is **primarily** about the underlying ideas behind how something works. This tag should be used in conjunction with another tag for the area of interest, for example [electrical] or [suspension]. It should not be used "stand alone." Please use the [engine-theory] tag for those questions.

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83 views

What are diamond cut alloy wheels?

I'm thinking of buying a new car, and one of the options it has is diamond cut alloy wheels. What's the difference between normal and diamond cut alloys?
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0answers
39 views

Why ambient temperature used to measure pressure for car ac system

Since the ac system is located mostly inside a car engine and the car is warmed up prior to adding freon, and the temp/humidity in engine bay is different from ambient temperature//humidity, and all ...
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0answers
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Do all cars rust eventually even with repeated proper rustproofing methods?

My understanding is that rustproofing works and lasts when done properly, but once the coating used to rustproof wears off I'm guessing the process to rustproof needs to be done all over again. With ...
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4answers
118 views

Work over time; humans versus automobiles

I've been doing some research lately on torque and horsepower to understand how they are connected to one another. Take my car, a 2.0 TDI, outputs 390 Nm torque. 390 Nm alone without considering an ...
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1answer
78 views

How is fuel pressure maintained when the pump isn't running?

Pretty simple question, if liquids are incompressible then how is fuel pressure "stored" when the fuel pump isn't running, i.e. after turning to run and waiting a few seconds, but not turning to start?...
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4answers
136 views

What does the hybrid engine do with surplus energy?

This question is based on Toyota Hybrid flyers / experience but I suppose it's meant to be general for hybrids? The concept is to use electric motor for braking (therefore often the power of electric ...
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1answer
204 views

Does a dual-clutch transmission require synchronizer cones?

When you shift in a traditional manual transmission, the clutch is disengaged and a sleeve is shifted from one gear to another. The teeth of the sleeve must align with the teeth of the target gear. ...
4
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1answer
11k views

What is surface charge and how does it affect battery testing?

I've read in numerous places that "surface charge" can give false positives when testing a battery, and you need to remove the said surface charge to get an accurate result. I've also read various ...
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1answer
505 views

Triangular/Parallel four-link suspension system, how it works

I've been really interested at car suspensions lately and this particular system confuses me the most... Are they simple hinges or do they also move other ways than that the angle they're placed ...
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5answers
76k views

How to convert Amp Hours to CCA?

Is there a formula for converting a battery amp hour rating, which is used in much of Europe and Asia, to an Cold Cranking Amps (CCA) rating?
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0answers
114 views

Can a Battery Conductance Test tell the difference between damaged plates and sulfation?

I'm just going to lay out my assumptions, or what I think I know, so that there's a better context for the question. I understand that there are basically four main situations in which a standard ...
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3answers
231 views

How would a car handle differently if it had independent brake controls, like a pedal bike?

Facts - Cars have one brake pedal. Bikes have two brake levers. So a cyclist can brake fully with the front or the rear, or some combination of both, or alternate between the brakes. If a car had ...
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2answers
550 views

What is torque steer?

I saw an old Top Gear episode, and I think it was Jeremy who said something along the lines of The torque steer is terrible What is torque steer though? Is it a bad thing? Why does it happen? ...
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3answers
110 views

Multiple Batteries Charging

I have multiple batteries off from motorcycles, and each of them has it's own charge level (12-13 Volt measured at rest). Assuming I have only one 12 Volt charger, can I charge them in parallel until ...
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3answers
2k views

How does a timing light detect the electricity in the plug wire?

I assume that a timing light functions by some kind of inductive pickup and the signal is amplified by power from the battery and turned into a flash at the bulb. But I was wondering, is it picking ...
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1answer
467 views

Why do hybrids have the aesthetic wheel cover on the body?

I've noticed that the manufacturers tend to cover the rear and/or front wheels on the hybrid models more often than the regular vehicles. Are there practical or functional reasons for the covers? Is ...
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1answer
2k views

Can a lightning strike cause your car to not run?

If lightning strikes a tree in your yard and your car is close by, can this cause your car to not work properly? I had an employee call in stating that lightning struck a tree beside their mobile ...
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6answers
5k views

Turbo equivalent on electric motors

Is there anything functionally equivalent to a turbo for electric motors? Obviously, I am not asking for something that reuses exhaust gases to force in more air, because there are no exhaust gases ...
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2answers
995 views

Why do electric motors produce peak torque instantly vs gasoline engines

On a separate forum, someone had asked why electric cars do not have transmissions. The simple answer was that electric cars produce peak torque at any RPM but the gasoline engine needs to rev up to ...
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1answer
17k views

How do electric car transmission systems work?

How do electric car transmission systems work? Does it have an auto or manual gear concept like gasoline vehicles? As an electric motor can run in any speed (slow), is it necessary to have a clutch?
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5answers
15k views

Is it possible to have a manual transmission electric car?

Reading about the new supercar from VW, I distinctly noticed when the author specifically mentioned shifting to "drive". I know the car in article is an automatic, but it got me thinking. Is it ...