On Jun 3, 1:45*pm, Billy Crabs wrote:
On Jun 2, 11:33*pm, Billy Crabs wrote:





On Jun 2, 11:08*pm, wrote:

On Jun 2, 8:00 pm, Billy Crabs wrote:

On Jun 2, 5:12 pm, Tony wrote:

Ram air is only as useful the allowing air to get to your carburater
faster but is not necessarily used. When your piston is on its intake
stroke(vaccum) your combustion chamber can only draw in enough air
that is in conjuction to the chambers volume and all other air that is
present after the compression stroke is exported to engines smog
devices and is recirculated only AFTER being filtered. *All engines
come off the assembly lines, be it an airplane motor or a vehicle
motor, to draw the amount of air that it needs to run at opptimum
performance. *Ram Air is a myth and don't try to throw "turbo" into
the conversation because turbo is recircualted exhaust and still has
unburnt fuel in the fumes.

I think you are quite wrong. Ram air in fact gives us a half inch or
so more manifold pressure, and that increases the total weight of the
air-fuel mixture in the cylinder. Reduce your 'it doesn't matter
argument to an extreme to see how it fails.

As for turbos, the turbine is powered by the exhaust gasses coming
from the engine, the exhaust gas itself is not reintroduced into the
cylinders. The turbine itself could be powered by an electric motor,
for that matter. That was the model for my tongue in cheek comment
about using a shop vac to increase manifold pressure.

The air going into the manifold has the same atmospheric weight as if
it was outside the manifold, what makes it denser is the addition of
fuel into the air/fuel mixture, unless the air is in a perfect vaccum
it will not increase in pressure and most certainly not density and
the turbos do reintroduce fuel back into the combustion mixture, If
you've ever seen a read out of carbon emissions for a non turbo
vehicle it still has enough unburnt fuel to power your vehicle for
another 5% of your fuel consumption *and turbos IF powered by a
motorized turbine are as useless as ram air because of the statement I
made in my previous post. your intake is only as much as the volume of
your cylinders

* * * * * * Turbocharging can be set to two different levels:
Turbonormalizing, which brings manifold pressure to sea level
pressure; and boosting, which raises manifold pressures to more than
30" Hg. If an engine is boosted, the air density in the cylinder at
the bottom of the intake stroke could be well above atmospheric.

I'm sorry to keep disagreeing but, but the pressure in which(if you
can call it pressure) goes through a manifold is increased by MAP
sensors which measure atmospheric pressure and regulates air fuel
mixture, it has nothing to do with "ram air" and I do agree that that
the density of the air/mixture is increased by the vaccum caused by a
piston at bottom dead center but we were talking about air before it
reaches the cylinder and the speed of which it arrives to carburation.

* * * * *Dan- Hide quoted text -

- Show quoted text -- Hide quoted text -

- Show quoted text -- Hide quoted text -

- Show quoted text -

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)- Hide quoted text -

Billy , I think you are confusing volume ( which is certainly fixed)
with mass of air. by increasing the pressure you increase the density
and therefore have a higher mass of air for the same volume. higher
mass of course means more energy for the same volume charge.
Terry
PPL Downunder