A suggestion and a few questions

[Praetorian]

First, the suggestion- a glossary of terms available in the Wiki- so people (who bother to look first) can easily find out what some of the commonly used GT terms & abbreviations are, such as:
NA 1. refers to a Naturaly Aspirated engine. 2. North America or North American
NTSC .. I'm still unclear of what this stands for
or many of the other terms commonly referenced such as names of real life drift racers etc.,

now the questions:
1.What is the difference between an L6 and a V6 engine?

2. what are the differences between DOHC, SOHC, OHV and Boxer engines?

3. what does it mean when a car has 6000rpm in power, and 3500rpm in torque?

4. Is a higher rpm in the torque preferable to a lower one?

5. Some cars have varying rpm ranges. example, the Audi RS 6 '02:
# Power: 447hp/5700-6400rpm
# Torque: 413.22ft.lb/1950-5500rpm
... whats that all about?

 

[opendriver]

1. an "L" engine is simply a slant engine, a "V" is well, a V configuration, same thing goes with W's too
2. The valves per cylinder; more valave means more power in some cases (the ceizeta has a QOHC)
3.the RPM it says is the range is were it makes the most torque and/or power, for some reason they insisted on puting "ranges" for power and torque.
4. Depends on the car,what engine it has, how heavy it is,drivetrain, ect.
5. see #3

hope this help and corect me if I am wrong in any way

 

[viperpilot]

ad 1. a L6 is a 6-cylinder-engine, where the cylinders stand in a row. in the V6 are 3cylinders on each side of the V.

ad 2. DOHC = double over head camshaft, SOHC = single over head camshaft,
OHV = over head valvetrain. a boxer engine is nearly the same as a V-engine, the difference is the angle between the cylinders. in the V-engine 90° and in the boxer 180°

ad 3. that means, that the power/torque-peak is at this rpm, if you shift after this rpm, you'll loose power/torque

the last two questions are hard to answer, but i hope i could help you with the first three.

viper

 

[viperpilot]

sorry opendriver, but the DOHC and so on is not for the valves, it's for the camshafts. the other things seem right to me.

viper

 

[Praetorian]

Ok thanks a lot, that clears up some of it

In the case of #5, can I assume that the varying pwr/trq rpms are in reference to gear levels? As in: 1st gear = 5700rpm pwr, 1950 trq; Final gear 6400rpm pwr, 5500rpm torque? (or something like that)

 

[niky]

Usually DOHC stands for dual camshafts per cylinder bank. The Cizeta is listed as QOHC because it has eight camshafts for two banks of 8 cylinders each... but this is a mistake in interpretation. The Cizeta actually has four banks of four cylinders each, as it's basically two DOHC V8s coupled at the center by the transmission in a sort of T-configuration. So it should be a twin V8 DOHC.

More valves doesn't always mean more power, it just ensures that the engine has a wider powerband, i.e. a wider range of rpms in which it makes good power, as the extra valves allow it to be tuned to breathe more easily over a wider range of engine speeds. Multi-valve designs are useful for enabling small engines to make more power without being too peaky.

V-engine angles are usually at 90°, but there are wide V's and narrow V's (Volkswagen/Audi V6s in the game are all narrow angle).

 

[niky]

5. Some cars have varying rpm ranges. example, the Audi RS 6 '02:
# Power: 447hp/5700-6400rpm
# Torque: 413.22ft.lb/1950-5500rpm

Ok thanks a lot, that clears up some of it

In the case of #5, can I assume that the varying pwr/trq rpms are in reference to gear levels? As in: 1st gear = 5700rpm pwr, 1950 trq; Final gear 6400rpm pwr, 5500rpm torque? (or something like that)

No. This means that maximum power comes in a broad band between 5700-6400rpm, no matter what the gear. You notice this more on turbo engines in the Audi/VW family. The engine's limited either by boost controller or the ECU (don't recall which) to 447hp and 413 ft-lbs of torque, even though it could make more.

So imagine the power curve, which on a normal engine, rises to a peak, then drops off.

Take a pair of scissors and lop the top off that curve. That's what the power limiter does. It indicates maybe the manufacturer thought that the transmission or head gaskets or some other engine part couldn't take any more power, so they limited it artificially.

 

[-Cheezman-]

ad 1. a L6 is a 6-cylinder-engine, where the cylinders stand in a row. in the V6 are 3cylinders on each side of the V.

ad 2. DOHC = double over head camshaft, SOHC = single over head camshaft,
OHV = over head valvetrain. a boxer engine is nearly the same as a V-engine, the difference is the angle between the cylinders. in the V-engine 90° and in the boxer 180°

ad 3. that means, that the power/torque-peak is at this rpm, if you shift after this rpm, you'll loose power/torque

the last two questions are hard to answer, but i hope i could help you with the first three.

viper

1.L is for a slant type engine. When they stand in a row, it is an I6, or inline 6 cylinder. A slant means the slant to one side.

2.DOHC, SOHC, so one are referring to the camshaft, a SOHC is a Single Over Head Cam, a DOHC is a Double/Duel Over Head Cam. A boxer is a vertical opposed cylinder engine where the Camshaft(s) run straight between the cylinders, rather than below them.

3.The RPM just means at that RPM range is where the engine will see its full "power load" before it starts to drop. This doesn't mean that you need to shift exactly at that though, although in most cases, the RPM is usually Redline (the red marked part of your gauge).

4. Some times yes, other times No, it varies from car to car... in most cases, lower RPM torque is a better choice for a heavy car because it gets the car moving quicker.

5. Just means at different RPM you will see peak performance, torque may see peak at a lower RPM than power.

Also NTSC Stands for "National Television Systems Committee", commonly used in North America. I believe...