"Billy Crabs" wrote

let me try to explain myself better, the amount of air that is drawn
into an engine is in direct coralation to cylinder volume and the cam
shafts "lift and duration" A valve can only stay open as long as the
cam lobe holds the lifter up, therefore only allowing as much air/fuel
as was scientificly formulated for the cylinder.
for instance, lets say you have two guys who are going to breath in
deep, now even if you are blowing an air hose in their faces, they are
only going to be able to inhale as much as there lungs will hold. Now
lets say they are inhaling pot and when they blow out its put into a
"turbo", the turbine spins and sends the unused pot back to their
lungs, but it's still only as much as they hold in their
lungs(cylinder volume)

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Sorry, but no ()'s for your above post.

Wow, what you don't understand about supercharging/turbocharging is "a
bunch."

In your above example, if one guy (instead of having an air hose blowing in
his face) had a guy with twice the lung capacity giving him mouth to mouth
recesitation as he was breathing in, and the guy blowing emptied his lungs
completely into the "breathing-in" guy, that would be a better analogy to
what a supercharger/turbocharger does.

He is physically forcing more air into the guy than he could normally breath
in, by forcing more air in throughout the intake stroke. Let's hope he has
strong lungs, so they don't explode.

That is what happens to engines that have extremely high boost running at
high output, sometimes. They can't stand the extra kick provided by all of
the extra air, gas, and resulting combustion. If the engine has a mass
airflow sensor, that is how it knows how much extra gas to feed into the
intake air. It can tell there is extra pressure, which gives the volume of
air being passed though it (the sensor) extra mass.

At _no time_ does a normal turbocharged/supercharged engine have already
used combustion gas put back into the next (or any other) intake cycle. The
only reason some engines have a feature like that would be for pollution
control.
--
Jim in NC