Amelioration is the exhaust with relaxation entonoir

[Flytox]

If we put a turbo to recover the energy of the exhaust, it's the opposite ...

And explain me well why you the ultimate being?

lol

Well, with the turbo you earn more than you lose.

With "normal" use, that is to say with chronic underuse of engine power, this is debatable. At low speed, the turbo is not very efficient but to be able to accept more power without rattling these engines are less compressed and therefore the output is lower ...

Still, the subject is relevant (for example, tacking the chicanes of the pot on a motorcycle increases the power).

This is not true in all cases, depends on the "degree of release", how it was done etc .... Often the carburetion is out of order and you can lose more than win (reliability, consumption).
On some cyclo, when we did not change the good chicanes ... we only won noise and lost 2 or 3 km / h .... Many young people would do better to measure the performance of their machine with a chronometer rather than with their ears ... or rather with the ears of others

[Alain G]

If we put a turbo to recover the energy of the exhaust, it's the opposite ...

And explain me well why you the ultimate being?

lol

Well, with the turbo you earn more than you lose.

Still, the subject is relevant (for example, tacking the chicanes of the pot on a motorcycle increases the power). By cons the biggest loss of load nowadays is the catalytic converter ...

Apart from increasing the power by increasing the amount of air / fuel mixture a turbo to the possibility of downsizing and reduce the weight of the engine and the internal friction that gives it a saving, the turbo increases the restriction to the exhaust that which increases the torque just like on an atmospheric one.

And I see no "contrary" to your previous comments!

Flytox

With "normal" use, that is to say with chronic underuse of engine power, this is debatable. At low speed, the turbo is not very efficient but to be able to accept more power without rattling these engines are less compressed and therefore the output is lower ...

This is no longer true if we consider that the engine is really smaller in displacement than what we were used to seeing in the past whereas the vacuum is smaller than on these larger engines than now or the room operates under a less strong vacuum which compensates for the low compression of a turbo.

[chatelot16]

the turbo can be used for everything following the way the engine is designed ... it can make a racing engine with high power and low efficiency ... but it can also make a high efficiency engine


when one looks for the high efficiency it is necessary that the temperature of exit with the escape is the lowest possible: to get there it is necessary that the beginning of the compression, is isothermal and not adiabatic: one is approached with the turbo intercooler: one completely cools the compressed air by the turbo before giving it to the engine ...

instead of the whole thermodynamic cycle being made by the piston, there is only the part at high pressure that is made by the piston ... a lot of the work and made by the turbo ... so the cylinder are smaller and lose less heat

but we are not in the same world ... when I see you quote as an economic engine 3,6l I understand why you call them tanks (assault)

[Flytox]

This is no longer true if we consider that the engine is really smaller in displacement than what we were used to seeing in the past whereas the vacuum is smaller than on these larger engines than now or the room operates under a less strong vacuum which compensates for the low compression of a turbo.

Not well understood what are you saying I do not see at all the connection with the displacement. The limit for the compression ratio of an engine is the "thermochemical" limit (that of knocking). The closer you get to it, over the widest possible rev range, the better the overall performance. Once you have chosen this volumetric ratio which allows such torque / power / on such speed range, without clicking, with such turbo pressure etc ... it must be done with when the turbo is no longer able to blow enough, especially at low speed (poor performance). And there the actual volumetric ratio is much lower than with an atmospheric engine (derisory overpressure of the turbo), resulting in a lower yield.

To limit this problem, another answer with a new technological orgy ... 2 turbo ..... and always not to do better than an atmospheric

[Alain G]

but we are not in the same world ... when I see you quote as an economic engine 3,6l I understand why you call them tanks (assault)

The economy is undoubtedly for the engine but surely not for the vehicle given its weight and aerodynamics!

A big American Ram 2013 pickup gives a conso of 7,8 liters with a pentastar engine 3,6 liters

Flytox


What I mean in fact is that the engine downsized work less in depression because of its small displacement and requires a greater effort than a larger engine and even if the compression is lower the same effort is required for the operating even at idle, to make simple a 2 turbo liters auras a less strong depression in the intake cycle that a displacement of 1 turbo liters for the same car and its accessories which will compensate the low compression of a turbo.

I hope that explains my heart of sight.

Ford is working hard on downsizing with its Ecoboost engine.

[marc91]

do not mix 2 time and 4 time

with a 4 time it is simply necessary that it sort out as easily as possible ... so an output in the box reduces a little the pressure drop rather than a simple exit ... so there is a little something to win

but alas a loudspeaker output greatly increases the sound emission: like a trumpet ... the increase in noise is a disadvantage more serious than the low power gain

Hello
, it was not a funnel outlet, but a "venturi" system creating a depression in the muffler, so little impact on noise level

[chatelot16]

I understood this mistake by reading more

the venturi effect at 100km / h will make a few millibar of depression! completely negligible

it is sure that it is only decorative!

[Other]

Hello

For a gain on the escape is to put a tuned exhaust, valid at a certain speed, the exit of the gases of a cylinder makes a depression in the other cylinders in general for the 4 cylinders in line one puts in common the 1et4 the 2et3


On a lycoming plane we connect the two opposed cylinders, there is a gain on the power but at the expense of a complex pipe to achieve and to lodge under the hood not to mention the heat released under a fiber hood.

[Christophe]

For me the funnels (cones) exhaust do work well on the 2 time ...

After if the acoustic agreement is MUCH less important on the 4 time than on the 2 time, there is actually on the 4 time acoustic mounts between the cylinders to improve the engine performance (flexibility in particular)

[Flytox]

Beautiful spagetti!

[Off-topic mode On]
http://www.dailymotion.com/video/x1ofrp ... On5bHetk8k


Can not resist it's too good
Who said it did not heat an exhaust? We do not see it on this video, but the spagetti is even more beautiful. The tubes are in inconel.
[Off Topic Mode Off]