Vacume and diesel engines

[J_J]

Read post #70, then look up the delta pressure and flow requirements for the accessory devices.

JB, I read that, and agree, and my point exactly. I am just wondering why all the discussion about vacuum on a diesel. It is there, just barely.

 

[Egon]

Quote:
Originally Posted by john_bud
Read post #70, then look up the delta pressure and flow requirements for the accessory devices.

JB, I read that, and agree, and my point exactly. I am just wondering why all the discussion about vacuum on a diesel. It is there, just barely.

Just wondering how a naturally aspirated diesel engine gets it's supply of combustion air
ehh?

 

[Soundguy]

" AP "

 

[638]

Through the intake manifold ?

 

[MikeyB]

and communicate.

How about this one. TTTTT If you're IFR rated:

Time
Turn
Twist
Throttle
Talk

Mike

 

[Matt_Jr]

How about this one. TTTTT If you're IFR rated:

Time
Turn
Twist
Throttle
Talk

Mike

Nice

 

[john_bud]

I am just wondering why all the discussion about vacuum on a diesel. It is there, just barely.

Now that is the definitive statement on naturally aspirated diesel manifold vacuum!!

 

[ArTrvlr]

ArTrvlr


Maybe you can tell us why most diesel engines need a vacuum pump to operate all the vacuum devises in autos and trucks.

JJ, you already explained that very well in your previous post. And the original poster's question was answered very well in the first two responses.

Almost everything since then has just been bickering over terminology. That was my point, you say ta-ma-to, I say to-ma-ta.

 

[J_J]

JJ, you already explained that very well in your previous post. And the original poster's question was answered very well in the first two responses.

Almost everything since then has just been bickering over terminology. That was my point, you say ta-ma-to, I say to-ma-ta.

What's my favorite meal? Beans ,taters,cornbread,and maters. From long ago.

 

[Renze]

The piston does not suck the air into the cylinder. Atmospheric pressure nominally 14.7 lbs forces air into the cylinder.

Atmospheric pressure - Wikipedia, the free encyclopedia

There is absolute pressure (the pressure that air puts on the circumference of a vacuumed body) and there is relative pressure ) Pressure above the atmosphere around us.

In 99% of the cases, weｴre talking relative pressure, which basically is the DIFFERENCE between atmospheric (the air around us) pressure, and the pressure in the closed body like a tire or air tank, which we are comparing with atmospheric pressure.

generally the atmospheric pressure is 1 bar, or 1 kg per square centimeter. this changes 15% up and down depending on the weather at sea level. At high altitude this pressure is even lower because the layer of air on top of it, has less weight pushing down on it to cause this atmospheric pressure.

So, atmospheric pressure changes quite a bit by weather and altitude. But we calculate with the rule of thumb that atmospheric pressure is 1 bar.