Tonights ? to ponder.

[Lightning Steve]

Okay was thinking about this on the way into work tonight while looking at my vac/boost gauge.

Okay, when in a vacuum the air/fuel charge is sucked into the combustion chamber. When in boost the air/fuel charge is forced into the combustion chamber.
But when your at "0" pressure, how does the engine get it's air/fuel charge and stay running?
:shrug:

 

[Nvr_Spds]

My guess is its equal parts boost, and vacuum???

 

[LightningClint]

That'd make sense

 

[StrangeHighways]

Okay was thinking about this on the way into work tonight while looking at my vac/boost gauge.

Okay, when in a vacuum the air/fuel charge is sucked into the combustion chamber. When in boost the air/fuel charge is forced into the combustion chamber.
But when your at "0" pressure, how does the engine get it's air/fuel charge and stay running?
:shrug:

See what happens when you try to think and your not use to it:beer:

 

[EnglishAdam]

Good question.


It's atmospheric pressure that forces air into the cylinders (until you get into boost) and atmospheric pressure is (approx)14.7psi at sea level.
The vacuum you see on the gauge is what is measured in the intake manifold.
So, when you see zero on the gauge, it's actually +14.7psi (or thereabouts) filling the cylinders.
In true terms, a pressure gauge for the blower should be marked in Psig (g=gauge).
True pressure (Psi) is always Psig + atmospheric pressure.

:beer:

 

[Fade 2 Black]

Couldn't have explained it any better Adam. :thumbsup: