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Questions tagged [gears]

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20
votes
11answers
35k views

Need I press clutch pedal while starting my car in neutral?

As I know, clutch pressing and neutral gear both disengage the engine from wheels. So will it matter if I do not press the clutch if I start in neutral?
18
votes
11answers
16k views

What's the best gear to leave a manual vehicle in when parked? [closed]

I've been told that reverse is the "strongest" gear, so in a manual transmission vehicle you should park your vehicle and leave it in reverse in the event of a parking brake failure. Others have said ...
16
votes
8answers
6k views

Is shifting to neutral on a decline more fuel efficient than keeping the gear engaged?

I always had the habit of shifting to neutral on long declines and using the brakes to slow down as needed. Intuition made me believe I'd be saving fuel as opposed to keeping a gear engaged. However, ...
14
votes
1answer
3k views

Is reverse gear in a manual transmission equivalent to any other gear?

Question is pretty well summarized in the title. If we were to order gears in terms of power provided, where would reverse fall between gears 1-5 on a manual transmission vehicle? Does it vary by ...
13
votes
6answers
4k views

What would happen if you shifted into reverse while you are going forward?

First, I am talking about manual cars and I know this is considered impossible because of the synchronized gears, but lets suppose that you can manage to shift gears (For example you could shift into ...
13
votes
1answer
8k views

What differences are there between straight cut and helical cut gears?

in formula one, and most other motorsports they use straight cut gears as shown below. in most normal cars you will see helical cut gears as shown below. if both teeth are the same thickness the ...
12
votes
4answers
8k views

Is it OK to skip gears on a motorcycle?

I'm not sure if this is on topic, but I'd like to know the answer before it comes a repair question. I have a Y2K Triumph Speed Triple - great bike. First gear comfortably takes to 90km/h. Needless ...
12
votes
2answers
5k views

Car won't come out of reverse gear unless rolling

I have a 1989 Nissan Skyline R31 and when I put it into reverse, it will refuse to come back out of gear. The clutch was changed a few thousand km's ago and has had this problem recently. The only ...
10
votes
3answers
3k views

What stops a car window from falling down?

I have been trying to research how the gears of the crank mechanism of a car window works, either manual or electric. I want to know why it doesn't fall down from gravity. Can anyone link me to an ...
9
votes
2answers
6k views

Switch from N to D without brake

Will it cause any damage to the engine/transmission if one switches from N to D without pressing the brake pedal? I was driving at about 40 mph when I accidentally switched to N. Then after a while I ...
9
votes
1answer
655 views

Pontiac G5 transmission sometimes grinds when shifting into first while stopped, occasionally stalls car

I have a 2007 Pontiac G5 with a 5-speed manual (Getrag F23 if you're curious) and about 145k miles. This problem has been ongoing for a couple years now but is progressively getting worse. Sometimes ...
8
votes
4answers
2k views

Riding motor cycle in a slow moving traffic

While riding in a slow moving traffic should I keep on switching to neutral when I stop the bike or should I keep the bike in 1st or 2nd gear holding the clutch? Does changing gears frequently cause ...
8
votes
1answer
813 views

How come gears don’t normally change in an automatic car?

I know that there is a similar question here, and another one here that asks when an automatic gearbox knows how to change gear, but I want to know exactly how it does that. It was brought to my ...
8
votes
2answers
27k views

What does it mean to have a stiff first gear?

This problem is a small one and it can only occur with manual cars, but I have been curious to find out more about it for a while now. Sometimes, when the car is attempting to pull away from a ...
8
votes
1answer
148k views

Why am I not moving after starting car and shifting to Drive?

So I have had this issue for the last couple months where when I first start the car, shifting to Drive (automatic transmission) doesn't do anything. Pressing the gas only revs the engine, as if in ...
7
votes
5answers
5k views

Does an increase in horsepower allow a greater speed in any given gear?

I wasn't sure if this was the best place to post this, or if I should go post it in the physics stackexchange as well. I can crosspost if this question would be more fitting over there. To put this ...
7
votes
1answer
10k views

Why do we push start cars in second gear?

I always wondered why you have to be in second gear when push starting a car. I know what all the process does, so my thought is that it would be better to do it in first gear. I think this because ...
7
votes
1answer
507 views

Any possibility of engine stall if engine brake is active during gear shift?

My understanding: Engine brake uses engine friction to damp the vehicle momentum. If one wishes to apply engine brake to assist manual gearshift,(activate engine brake, rpm dies, shift to lower gear),...
7
votes
2answers
3k views

Hard shifting on 2003 VW Jetta 1,8 with manual transmission

After unrelated repair in the shop, my car began to have difficulties going into 5th gear. Gradually over the next couple of days, it was noticeable that the car refused to engage into 3rd, and now ...
6
votes
2answers
5k views

Why are gears designed in this pattern in motorcycles? [duplicate]

On motorcycles with manual transmissions, the shifting gears goes (down to up) like this: 1st Gear (all down) Neutral (half up) 2nd (full up) 3rd (so on) What is the logic behind this? Wouldn't it ...
6
votes
2answers
5k views

1st gear hard to engage unless stopped, Subaru 2004 Impreza Outback Sport

Since I've bought my 2004 Impreza Outback Sport, I've had a problem with shifting into 1st gear. First gear is generally difficult to engage while moving. You can just force it, but it's really ...
6
votes
2answers
2k views

What is the best “automatic” gear to be in when going up a snowy incline?

My car is a Volvo S80, it's great in ground-level snow. I tried going up an incline in "D" and it wasn't having it, basically just slowed down and stopped dead in its tracks. I have never used the 3 ...
6
votes
2answers
311 views

Manual transmission noise

What causes a grinding or scratching noise when shifting from 2nd to 3rd Gear on a 2000 Celica GT? I did have my mechanic add some gear oil but was thinking maybe I should have him drain out old ...
6
votes
1answer
5k views

My gear switches out of Drive and into neutral while driving automatically

I was wondering what might be the problem with my gear. Sorry, my terminology is bad I'm not a car enthusiast. Anyways, when I first turn on the car, I feel a little tension in the gear when I pull ...
6
votes
3answers
37k views

Motorcycle gears seem really stiff and hard to shift when cold

So I have noticed that even for a fruther 10 to 15 mins after warm up, the gear lever on my motorcycle (bought brand new - 6 months old) seems really stiff and harder to change. Could this have ...
6
votes
2answers
27k views

Buzzing noise or whining noise from center of car while driving, not related to engine speed

My 2003 Passat B5 TDI with 6-speed gearbox is making a buzzing/whining(?) noise while driving and it appears as if it comes from under the gear shifter. The noise is: Dependent on road speed (more ...
5
votes
1answer
144 views

Acceleration pickup of a car

When I say "Tata Winger can accelerate from 0 to 100 Kmph in nearly 19 to 20 seconds, which is quite good for this class" - how is it measured? Is this by accelerating the car from 0 to 100 kmph on a ...
5
votes
1answer
5k views

Difficulty of shifting down to 1st while moving (manual)

The gearbox from the car I'm rebuilding (Skoda Estelle '72, rear mounted engine, RWD, manual transmission) has the following problem: I can shift up/down with engine off I can shift up/down with ...
5
votes
1answer
954 views

Starter motor doesn't “let go”

My wife owns a 2008 Nissan Micra/March, commonly known as the K12 (originally from Japan if that makes a difference). We've noticed over the last few weeks that, when starting the car, the starter ...
5
votes
3answers
1k views

Motorcycle gear changes alternate between stiff and normal

I have a 6 month old Kawasaki W800 I bought new. Sometimes when I ride gear changes seem stiff and clunky. Other times they seem smooth and normal. Would anyone know what could be causing this? ...
5
votes
3answers
71k views

Reverse Gear Doesn't Work Anymore on an Automatic

I've been having troubles with my automatic transmission for sometime now mainly it's lost it's smoothness and has been slipping first thing in the morning. I've practically worked on every other ...
4
votes
2answers
2k views

Rental car gearbox broke down

Last week end, I rented a car, fairly new car (probably 1 year old). On the way to give it back, 20 minutes before arriving, the gearbox just broke. I couldn't accelerate etc. During the week end, I ...
4
votes
1answer
525 views

Driving down hill in gear without throttle

I have read in an article that when the car is in gear instead of being in neutral while driving downhill, the pistons in the engine are being "rotated" by the rotational speed of the wheels. When ...
4
votes
2answers
2k views

My car locks lower gears when on high speed, why?

When I'm on say 50 Km/h my first gear is not accesible and second gear is too, 3rd gear however is hard to push in but 4th gear is easy to slip in, why?
4
votes
1answer
5k views

Why are most motorcycles 5 speed than 6 speed?

I have a Honda Trigger motorcycle. I have seen most of the motorcycles even like Karizma ZMR having 5 gears. What would be the reason to have just 5 gears even for 223 cc motorcycles?
4
votes
2answers
911 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 ...
4
votes
2answers
504 views

What's this inside my gear shift?

Is there a laser or something in there because it's really bright and looks weird and has a different look I'm pretty sure it isn't but it's weird .
4
votes
2answers
874 views

Why after a certain RPM with the same gear selected the car no longer accelerates?

I have basic understanding of gearboxes and why we use them, but what is baffling me is that after about 4000 RPM (at least in my car) it doesn't accelerate further (or it does slowly)... This seems ...
4
votes
2answers
522 views

Name of inverter gear cog in English

One time, I had in my hand an object, part of a tractor gearbox, and i know its Portuguese name:"carreto inversor". The device has two cogs, one is the input and the other is the output. The function ...
4
votes
4answers
12k views

Gear Linkage repairs for VW Polo Mk3 (1997)

I had a problem changing gears on my Polo (1997, 1.4 petrol, 3 door, UK). It was hard to find the gears especially 1st and 2nd, and reverse would grind, and it was worse when the car was warmed up ...
4
votes
1answer
4k views

Is intentional kick-down bad for the engine?

I have a car with automatic gear (Mitsubishi 1600cc, if it matters) and sometimes when I want to gain speed quickly (e.g. when passing a slower car in a two-way road) I do a kick-down. I know it ...
4
votes
2answers
1k views

Replacing 3rd gear synchro on a Tacoma

I have a 4WD 2007 Tacoma V6 manual with 6 speeds. This model has a notorious reoccurring problem with its 3rd gear, which is due to the synchro going bad on that gear, as per many online testimonials....
4
votes
1answer
498 views

After long journeys, gear slips in 5th, but not into neutral

This is a follow up to another question I asked. I've managed to get some video of it happening this time. It started happening after travelling for about 2 hours. I was experiencing heavy traffic. ...
4
votes
3answers
3k views

BMW e36 320i motor looses power significantly out of a sudden

I have a 1992 BMW e36 320i, when i start in the morning, or in cold weather, the cars functions normally and has a lot of power. However, after a little, or when the weather is hot, the car ...
4
votes
1answer
151 views

Does putting vehicle in neutral at slope cause clutch plate spoilage?

I am having a Hero Honda Passion 2002 model motorcycle. I have a doubt regarding clutch and Neutral functionality. I have observed that most of the time in our city the roads have ups and down so ...
4
votes
1answer
2k views

Grinding gearbox problem

My brother has a honda civic type R that he bought 2nd hand a few months ago. Every time he tries to shift into 3rd gear, there is a faint grinding niose coming from the engine. Sometimes before ...
4
votes
0answers
83 views

Weirdest power loss pattern

I've a CDTI Opel Meriva from 2003. It started having this weird issue 2~ years ago and it hasn't really improved or worsened, but I've taken it to the official Opel service and various mechanics and ...
3
votes
6answers
13k views

Still safe to use a helmet when it's dropped?

I dropped my helmet from the seat of my motorcycle. Is it still safe to use it?
3
votes
3answers
2k views

Safe engine braking in automatic cars

When I was learning to drive, I took my lessons in a manual car. On one of the lessons I was performing a reversing maneuver and I controlled the car on both the clutch and the brake pedal... which I ...
3
votes
2answers
6k views

Why doesn't a car parked in first gear roll backwards?

In manual transmission, it is common practice to park a car in the first gear on uphills or in reverse gear on slopes - in addition to park brakes of course, but let's assume it is not being used in ...