X-Mozilla-Keys:
Jeff Spitzer wrote:
Brian D. Cain wrote:
Hey guys, I'm not sure if you guys would know this but I'd like to take a
shot in the dark anyways. I'm looking for data that may show things like
combustion chamber area at TDC (dependant upon compression ratio
of course), the amount of air, in lbs/hr or lbs/min, a single chamber can
move, etc. etc. I would just like to know how much mass air a single
chamber can move at (x) RPM, etc. I'd like some real, hard data to
use in calculations for doing things and experimentation on a more
engineering level vs. the "hey bolt this on it'll make you go faster"
high-school nonsense.
I've always been interested in this kind of data but noone's got jack for
answers on it. They're either ignorant to the information or they've got
it stashed in their little black books.
Thanks.
B
Paul wrote:
Air usage depends of the volumetric efficiency. One chamber is the same
as a 1.3 liter four cycle piston engine.
Actually both chambers are 1.3 liters. Airflow is displacement*VE*RPM,
more importantly massflow is displacement*VE*RPM*density of the charge
Jeff both chambers are the same as a 2.6 liter FOUR cycle
piston engine as far as airflow is concerned.
You are correct in that actual air usage is like a 1.3 liter
TWO cycle engine.
The VE can vary between
60% and 110% depending on tuning pipe lengths, RPM and the phase
of the moon among other things. Not of course to mention turbo's.
Turbo-ing changes density, not VE. VE is mostly related to port size,
timing, and manifold tuning and flow.
Jeff Spitzer
Yes in one sense that is true. But volumetric eff. is based on
everything being standard density. If you correct the volume
to standard density than the volumetric eff. of a turbo is
much higher than a NA engine. HP consumed by the turbo is
ignored of course.
Paul Lamar
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