Hello
Targol wrote:
[...] Quote:
23. Move quickly to the higher gear.
There, I am not sure that it is a very good advice. Rolling under steady state is not necessarily good for the engine ... I await the opinion of motor specialists like André, Bucheron or others.
Every engine has a diet or are yield is the best
On a diesel engine (which runs on diesel) the efficiency is at its best when the engine is running at its maximum torque with a low injection it is in these conditions that it looks more like the diesel cycle (I speak for the mechanical injections engines)
For the oil market it is the same principle but with the combustion temperature load requires ..
For gasoline engines the efficiency is a better at maximum torque but in load (unlike diesel)
less effort to syphonate through a partially closed pappillon, better filling, more compression and the ability to walk at a poorer ratio as filling increases.
This technique was developed in the 30 years on Panam planes, and was used by all bomber pilots during the Second World War, to increase aircraft range. (not for economy)
This consits to use the engine at maximum torque and increase the pitch of the propeller (load) and deplete the mixture.
Reality means that our petrol cars all have motors too big for the use we make, it would be better to have less powerful engines and use them in the 3 / 4 their power continuously.
For diesel it is otherwise, often in the same vehicle can have either a motor or a 1,5 2 liter engine liters, note that if you drive a 100km with these vehicles on the differrence consomation is approximately the same.
We also note that a golf has 4 speed and less economic than a golf 5 has same engine speed if you drive 100kmh .. (the 5 speed just runs on its maximum torque, while the 4 speed exceeds its maximum torque)
The maximum torque of a motor is determined on a bench and these values are conditioned by the mechanical friction which takes on too much importance at low speed in load, and the filling which decreases at high speed. At very high speeds the linear speeds of the pistons, the rebound of the valves and the vibrations of the engine, the difficulty of evacuating the exhaust gases absorb too much energy.
To ride with the maximum torque does not mean to roll in under regime, to roll in under regime means to roll below the maximum torque, solicited the engine, the mechanical friction of the piston becomes important ..
So pass the top speed when the engine has reached its maximum torque regime .. (2400 rpm for mercedes 300TD)
and that's where the automatic gearbox changes if you do not support it too much)
Another thing I am not a specialist, just a few experiments on engines and mechanics.
Andre