https://autojosh.com/understanding-drive-belts-car/

The advantage of the timing belt over the timing chain is that if the timing belt fails, there is less potential for damage to valves and pistons.

GAZZUZZ:


not true

obafemee80:

Timing belts are also quieter
@GAZZUZZ,Can you pls explain the reason sir?

GAZZUZZ:


the belt or the chain has nothing to do with valave damage during failure. the type of engine design is what matters. In interferance engines the piston can travel the distance of the valve area, and will come in contact with the valves if there is failure on the chain or belt.

GAZZUZZ:


not true

ademoladeji:
What about Seatbelt?

GAZZUZZ:


the belt or the chain has nothing to do with valve damage during failure. the type of engine design is what matters. In interference engines the piston can travel the distance of the valve area, and will come in contact with the valves if there is failure on the chain or belt.

ademoladeji:
What about Seatbelt?

GAZZUZZ:


cheap drugs

KingBish:
Let me buy a car first, then I'll come back and read the post.

KingBish:
Let me buy a car first, then I'll come back and read the post.

ExInferis:
Image 1: Typical engine

Image 2: Tesla Motor's "engine".

Just 2 moving parts, the stator and rotor.

No flywheel, belts, chains, pistons, valves, cams, cylinders, drive shafts, crankshafts, spark plugs, injectors, catalytic converters, radiators, coolant, brake fluid, engine oil.....

And no transmission.

Electric cars are the future.

Jagermeister:


Agreeable.

Tesla's are not entirely without transmission as you imagine, it doesn't change gears sequentially but it has a single gear that's progressive. Bear in mind in mind that it made them slower.

Tesla's have individual electronic controllers that work as differentials. They adjust the speed of the electric motors when it recognises that the vehicle is slowing down.. Tesla's don't have real locking or real differentials and so I might not ply the Tesla route if I'm seeking to go off-road or safety on high speeds or worst still, while in racing conditions.

True petrol-heads will always be petrol-heads.

People like me.

ExInferis:


They have a single gear to reduce the motor's speed.

A traditional transmission, or gear box, controls speed by varying the gear ratios.

And that's precisely what i mean that Tesla does not have a transmission because the inverter handles speed by increasing the current.

The gear in Tesla's drivetrain works diferent from a traditional gearbox.

As for differentials, Tesla uses sensors and a computer to control the differentials so wheels spin at the appropriate rate when needed.

It's not really an off-road vehicle though.

Jagermeister:


No, they have a single gear to effect weight reduction and efficiency. The reduction in top-speed wasn't exactly preferred, it was a trade-off for the single gear system. Newer Tesla models might be faster as a proof to that.

I already mentioned the second, third and fourth line of your post about the transmission.

And No, Tesla's has not differentials because they are fully electric.

ExInferis:


These prove you wrong:

Differentials

https://www.google.com.ng/amp/www.teslarati.com/how-tesla-model-s-traction-control-system-works/amp/


Gear

https://forums.tesla.com/forum/forums/how-does-transmission-work

Like i said, the gear only serves to reduce RPM. EVs by design have the full range of torque from the get-go. They don't need gear ratios.

The inverter varies speed, the single gear syatem reduces engine RPM.

The shafts go directly to the differential gears.

Jagermeister:


I'll check the links.

EVs don't require RPM readings because there's none of that crankshaft, camshafts or pistons revolutions. All these we already know.

Know this fam. The gear is not there to reduce the speed or Revolutions per minute(RPM) as you called it. Electric cars are not designed to go as fast or as powerful as petrol-powered cars( except maybe the Mercedes Benz sls AMG electric drive). They were designed for efficiency and safer environments(going green).. There's just been improvisations by Tesla in terms of speed.

If EVs are as powerful as you think, they won't blow out their juice in weeks.

RPMs have nothing to do with torques or gear ratios. Gearboxes work with the engine but has not relationship with engine RPM.

Yes they(EVs) have very powerful electric motors so they are provided with full torque currents to power the bulk of the vehicle and they certainly don't need gear ratios because they don't have conventional gearboxes like petrol or diesel-powered vehicles.

I'll still open to thread to know where I'm wrong.

Jagermeister:

RPMs have nothing to do with torques or gear ratios. Gearboxes work with the engine but has not relationship with engine RPM.

Jagermeister:

Know this fam. The gear is not there to reduce the speed or Revolutions per minute(RPM) as you called it. Electric cars are not designed to go as fast or as powerful as petrol-powered cars( except maybe the Mercedes Benz sls AMG electric drive). They were designed for efficiency and safer environments(going green).. There's just been improvisations by Tesla in terms of speed.

ExInferis:


You said



Power (HP) = torque x RPM ÷5252.

The relationship between torque and RPM translates into a car's power.

Most cars produce the highest torque in the 3k to 4k RPM range, which is why the 3rd gear is usually used to haul heavy loads.

So yes RPMs have all to do with an engine's revolution per minute.

As for the relationship between RPM and speed: the faster the engine revs when the gear is engaged, the faster the ratios must be changed. At the 4th gear the ratio is 1:1 while anything above is overdrive. You can't shift thru the geara at too low RPMs, especially for manuals.

Tesla, like virtually all EVs, has all its torque at the start because there's none of that engine spooling stuff; a DC motor turns faster with more frequency almost instantly with input.

Check out the torque chart attached.



Also refer to the chart on torque below.

See the speed curve?

Tesla Model S P100D does 0.60 mph in 2.28 seconds! That's so fast they call it "Ludicrous Mode".

The latest Bugatti, the Chiron, does 0.60 in 2.3 seconds, slower than the Model S.

And yet you claim "electric cars are not designed to go as fast or as powerful as a petrol car."

An electric motor will always be more efficient than an ICE engine in terms of power output.

You also claim that "If EVs are as powerful as you think, they won't blow out their juice in weeks"

I find this an odd thing to say.

A Bugatti Chiron going top speed pedal-to-the-metal will exhaust its fuel in 15 minutes.

A hypermiling Model S got 900km on a single charge.

In any case, you need to research more about Tesla's products, from the Roadster to the new Model 3 to dispel your notion of an EV being nothing but a glorified golf cart.

Jagermeister:


Ugh! Where do I start from.

I may have misrepresented a few things here.. But you my friend has got to refrain from relying too much on your textbooks.

Now, I saw the new Topgear episode where Rory Reid murdered a Ford Mustang in a drag race. Tesla's have astronomical power, no debate... I've also seen Jeremy on Topgear test the SLS AMG electric against its petrol twin. I mentioned that also. I also mentioned the improvisations from Tesla.. Older EVs were not powerful man. Was the Toyota Prius any good?

Talking about efficiency, Tesla Models are not the most efficient IMO, not even the Model S.. They are just very compliant on avoiding green-house emissions and bio-hazards. Here's an example (this is coming from the top of my head), The BMW i8, has an electric motor and a small internal combustion engine( that you talked about),which we know as a hybrid. A bit of both worlds.. I'd choose the BMW over the Tesla and I know you probably would too. With the Hybrid, you would less likely be stranded when you run out of juice( common sense).

The Chiron is a hyper-car, is the Tesla? Why wouldn't it run out of gas upon hard driving?

I don't remember saying RPMs had nothing to do with the engine. It would be ridiculous if I did. RPM means revolutions per minute. It's a measure used to determine rotational speed of mechanical components (of the car, in this case).

What you said about gear ratio as it relates to speed-increment is common knowledge.

I still can't and won't agree that the sole reason single-speed gearbox(s) are fitted to Tesla models was to reduce its speed. What I however said earlier was top-speed and not it's electric motor speed.

There's a few places you missed it however, and for all the other things you said, I had agreed with you then and I haven't started disagreeing.

ExInferis:


Just watch that youtube video.

Then come back.

Ps:

you did say rpm has nothing to do with torque and gear ratios.

I quoted you verbatim.

And that's why I went to the trouble of explaining how RPM and torque are related, and how gear ratios work with RPM.

Meanwhile the range anxiety you're talking of is an issue only where Tesla's supercharger network does not exist.

We're looking at the long term vision of Tesla and not just the immediate term.

EVs are the future whether we like it or not. ICE will go the way of the steam engine.

Now, pls watch that youtube video then let's talk.