Sorry Tom, I didn't ask the question correctly (or I may be off in left
field). This comes from some time spent in a place called Flow Dynamics
Laboratory where inlet design of blowers was being tested. My application was
sawdust material moving. Dan, the owner, explained how pressure was much more
effective than vacuum for moving mass. He explained that drag in a vacuum is
hard to overcome, while pressure fills the space with molecules and can push
materials great distances.
When talking engines, for example on my 74 Ford f600, I watch the vacuum gage
and see that it is around 18-22" of vacuum, warmed up 1200 rpm or so (driving
hydraulic pump). So what goes to the cylinders is not atmospheric pressure, it
is around half, perhaps less.
I'm trying to understand how engine efficiency is related to both air and
gas pressure and density. If producer gas is operating with 18/1 in a normally
aspirated engine, due to high octane, how will the ratio be affected if one has
positive pressure at one or two pounds?
Seemingly this would involve air flow across an orifice, similar to a butterfly
valve (throttle), but I am at a loss for a good start point.
Given a large quantity of air and gas to make comparable power (not large
derated), the flow of air/gas in a large displacement engine would seem to be a
much more critical factor than just saying the cylinder is seeing atmosphere
pressure and forgetting the drag that manifolds, throttle valves and pulling
gas from a gasifier creates (in a suction system). I can hardly see a direct
linear relationship.
My work is a low pressure system, so this is not an academic or theoretical
discussion that I will never act on and I'm at a point of determining engine
for a CHP and what internal modifications to plan, if any. I have several
engines, a 345 International, a 460 Ford, a Cumins 5.7 (with needed repair), a
7.3 International (in a ford truck also needing repair).
Sorry if this is confusing or not cogent. I'm trying.
Toby
seilertechco
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