Even though automatic transmissions have taken over the car business, car fans still like manual gearboxes. You can’t even buy a Ferrari or Lamborghini with a manual transmission anymore. Still, there is a reason why purists like cars with a stick shift. We’ve already talked about the different kinds of automatic transmissions. Now, let’s take a look at the different kinds of manual gearboxes.
Sequential manual transmission, unsynchronized transmission, and constant mesh gearbox are the three different kinds of manual transmission.
Let’s talk more about the different kinds of manual transmissions:
Sequential Manual Transmission
When most of us think of a manual transmission, we picture a shifter with a “H” shape. But something called sequential transmission is different from everything else. If you’ve ever used a motorcycle, you know that you can change gears by moving the lever up or down. This is called a sequential gearbox.
If you have ever seen a superbike with a quick-shifter, you know that it changes gears very quickly. Because of this, sequential gearboxes are often used in motorsports. Also, the sequential gearbox is easy to fix because it is simple. Sequential gearboxes are different because they don’t let you skip gears. For example, you can go straight from 1st gear to 3rd gear. Healtech quickshifter: our review
The first type of manual transmission was made in the late 1800s, and it was not synchronised. This was the first time the gears were turned by sliding them along the shaft. To master this type of gearbox, you had to know how to use the throttle and shift at the right time.
This was because the gears needed to be moving at about the same speed for them to fit together well. When you change gears, if the gears are spinning at different speeds, it could cause the gearbox to break. People who have been in this situation know that it’s not fun to hear your gearbox scream in pain.
It’s no wonder that transmissions that aren’t in sync are also called “crash boxes” because they don’t work together and make a lot of noise when they don’t. Find out more about how to double clutch a transmission that is not synchronised below.
Why is double clutching required for older cars?
With a gearbox that is not synchronised, you can do something called “double clutching.” So, you shouldn’t drive an old car if you don’t know how to double clutch. How to do a double clutch:
1) Press down on the clutch pedal to get the transmissions moving again.
2) Put the car in the neutral gear.
3) Let go of the clutch lever and rev the engine to the right rpm for the next gear. How much to rev is something you learn with time. But most of the time, if you are driving slowly, a light tap on the throttle will be enough. If you are going fast and the engine is revving out, you need to get more rpm while the car is in neutral. 4) Pull the clutch in and move to the next gear.
As you can see, you have to press the clutch twice to change one gear. It’s called double clutching because of this.
Synchronized / Constant Mesh Gearbox
A constant mesh gearbox is better than a manual transmission that wasn’t synchronised and required hard skills like double clutching. All manual transmission cars made in the last few decades have a gearbox with a constant mesh.
The main purpose of a constant mesh gearbox was to keep the gears on both shafts turning at the same speed. The gears on the layshaft can’t move, but the gears on the output shaft can because they sit on bearings. How to choose the right gear oil for your stick shift
Straight Cut Gears & Helical Cut Gears
Most cars today have gears inside the transmission case that are cut at an angle. Most race cars have gears with straight cuts. They aren’t used in road cars because they are loud and bumpy.
Straight-cut gears are good for use in motorsports because they don’t cause side-to-side axial load. This sideways force is often made by helical cut gears and applied through the input shaft. This side-to-side force needs strong transmission parts to handle it. Top 10 signs that a transmission is going bad
Straight cut gears don’t make this force, so even when a lot of torque is put through the gears, the other parts are less likely to break.
When helical gears are used, the transmission case and shafts have to be made stronger, which makes the car heavier. This is another good reason why race cars don’t need helical gears (weight saving reasons). And did I say they are easier to put together?
Automated Manual Transmission
With automated manual transmission, the manual gearbox is made to work more like an automatic one. For this, the car’s ECU uses hydraulics to control the gear selector and clutch. The ECU software tells the hydraulic actuators when to change gears and how to do it.
Still, the AMT transmission has a mode called “Tiptronic” that lets you change gears yourself and let the unit take care of the clutch work. Yes, they don’t work as well as a real automatic transmission, but they are a low-cost alternative.
SMG transmission, which is a type of AMT gearbox, was also added to the BMW M3 E46 in 2003. (sequential manual gearbox).