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16 votes
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Why when I turn the front wheels by hand, the crankshaft doesn't rotate?

Between the engine and transmission assembly (or part of the transmission assembly) there is a set of gears called the differential. Its purpose is to enable the outside wheel faster rotation when ...
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5 votes

Where is extra fuel consumption in RWD and AWD cars dissipated?

The short, easy answer: heat. That energy is being converted to heat in the driveline components for various reasons. It's important to note that these numbers are aggregates, however, and a really ...
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4 votes

Where is extra fuel consumption in RWD and AWD cars dissipated?

Your premise is wrong. The main reasons FWD cars are more commonplace today are: easier assembly: the entire drivetrain goes into the chassis as one complete assembly. unibody construction: FWD cars ...
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4 votes

Where is extra fuel consumption in RWD and AWD cars dissipated?

There is no fundamental reason for RWD to be less fuel efficient than FWD. There are many advantages to FWD, fuel efficiency is not a driver. Most rear drive cars these days are sport(y) , ...
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  • 318
3 votes

Where is extra fuel consumption in RWD and AWD cars dissipated?

It's difficult to reach a conclusive answer, but you're on the right track with the extra mass of a RWD transmission - the propeller shaft taking power to the rear wheels adds some considerable weight....
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3 votes

My AWD car has a FWD option. Why/When would/should I use FWD?

Typically part time 4WD is not the same as AWD. Part time 4WD will actually lock the front and rear axles together, not providing a differential between them to handle the speed differences between ...
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2 votes
Accepted

What's wrong with my car?

Given your description I think that you have a serious issue with the flywheel / clutch assembly. "Banging noise and no gears" so no connection from the engine to drive wheels... Then when you try to ...
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2 votes
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Can all wheel drive cars run like a front wheel drive if all wheel drive system fails?

Possibly. It depends on what is wrong with it and how the AWD is setup in the vehicle. About the only way this could work is if a rear drive line had gone out (like u-joints) and it was removed. The ...
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2 votes
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Mismatched brand tires on back, bad on high speeds?

If they are matched brand across the axle you'll be fine for the sort of driving you describe - assuming the new rears are of comparable quality to the fronts. If you put ditchfinders on the rear you ...
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1 vote

Can all wheel drive cars run like a front wheel drive if all wheel drive system fails?

This depends on the system. One with a centre differential can drive the front, or rear, only but must have the centre differential locked otherwise it will just spin... Vehicles that did not have a ...
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1 vote

Mismatched brand tires on back, bad on high speeds?

If it is winter and you have summer on the back and winter on the front then you will definitely notice. Summer all round and not four wheel drive will be ok. If it was 4 wheel drive then keeping the ...
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1 vote

Does Torque Steer damage The Car?

It's doubtful. Almost all FWD cars have some amount of torque steer, unless they have equal-length CV/halfshafts - which is very difficult to package in an inexpensive car. Even in extreme cases (...
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1 vote

My AWD car has a FWD option. Why/When would/should I use FWD?

When comparing FWD to RWD, they each have their separate advantages: RWD is better off the line (as you've testified to), and FWD is better while maneuvering in and out of places with horrible ...
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