Diesel Style Whistle

[South]

How was the fuel pump and butterfly controlled? Throttle link goes directly to the fuel pump...

All Turbos whistle, just to certain degrees, you will never get a silent turbo... I have a massive high pitch squeal, but that's because of the very thin metal hot and cold side piping, they exaggerate the noise. It's part of the fun to having these cars...

[PHANTMXR6]

  South said:

Back to school little boy, Diesel do not have vacuum! There is no butterfly in the throttle, the induction is controlled by the fuel pump. Inject more diesel, bang is bigger, more air gets sucked in, revs go up.

Just because there's no butterfly doesn't mean there's no vacuum.

Do you know how a four stroke engine works?

'Manifold vacuum in diesel engines

Many diesel engines do not have butterfly valve throttles. The manifold is connected directly to the air intake and the only suction created is that caused by the descending piston with no venturi to increase it, and the engine power is controlled by varying the amount of fuel that is injected into the cylinder by a fuel injection system. This assists in making diesels much more efficient than petrol engines.

If vacuum is required (vehicles that can be fitted with both petrol and diesel engines often have systems requiring it), a butterfly valve connected to the throttle can be fitted to the manifold. This reduces efficiency and is still not as effective as it is not connected to a venturi. Since low-pressure is only created on the over-run (such as when descending hills with a closed throttle), not over a wide range of situations as in a petrol engine, a vacuum tank is fitted.'

So according to this there is vacuum in a diesel.

[South]

How long did you spend researching this, LMAO!

You just contradicted your own post. You found an article that potentially supports your claim for a diesel having vacuum, however the article informs that should vacuum be required a butterfly will be installed, this will howevre show minimal results of vacuum and will reduce engine efficeincy.

However at the beginning of your post, you said "Just because there's no butterfly doesn't mean there's no vacuum." So which one is it, a diesel has vacuum all the time, or a diesel only has a tiny amount of vacuum when a butterfly is installed?

Do you know how any engines work? I would recommend that you sit down with a diesel mechanic so that you can learn more.

[PHANTMXR6]

In an engine what happens on the intake stroke?

Piston goes down creating a vacuum in the cylinder hence drawing air or air/fuel mix into the cylinder.

Is this not vacuum?

[South]

Well, considering your first quote was from wikipedia, and I have seen the same wiki, you will have noted from that wiki how a diesel engine works with relation to intake.

I will quote it, just in case you missed it.

"The manifold is connected directly to the air intake and the only suction created is that caused by the descending piston with no venturi to increase it, and the engine power is controlled by varying the amount of fuel that is injected into the cylinder by a fuel injection system. This assists in making diesels much more efficient than petrol engines."

Now isn't that what I said originally, the intake is controlled by the fuel pump, the more diesel you inject, the greater the bang, rev increase, air is drawn into the engine.

Now if you would like to learn even more about Diesels, which are vastly different from Petrol engines, please go to another much more informative wiki http://en.wikipedia.org/wiki/Diesel_engine

Enjoy your reading. Look up further information about manifold vacuum as that is what you are referring to and at the moment don't quite comprehend.

[Dagabond]

Take it easy girls....you are talking about nothing after all....

[tab]

The vacuum in my head seems to be getting greater after reading this

[PHANTMXR6]

  South said:

Back to school little boy, Diesel do not have vacuum!

This is what you said first.

I never once made reference to manifold vacuum.

All I ever said was an engine will produce vacuum, as in the piston goes down on the intake stroke creating vacuum.

Diesel or petrol engine.

[South]

Nice try to save yourself, don't understand how things work so find a means to work around what you have miss understood!

You still don't comprehend how it works at all, the drawing of air is not under vaccum. Your argument is that the intake stroke is under vacuum, it is quite clearly not. Bloody hell, stop arguing a point that you don't understand!

[PHANTMXR6]

Perhaps I just have a different understanding than you.