[mwebb]

Mwebb offers some graphs of cylinder pressure which show that less air gets into the cylinder at idle than at wide open throttle. And then tries to claim that the difference in peak pressure at TDC is somehow representative of pumping power. As I showed, if you used an Atkinson type engine in the same experiment you would get the same graph but no pumping loss. Mwebb posted a different graph showing the same thing and then claiming that "calculated load" was also a good representation of pumping power. It isn't. Calculated load is used to compare volumetric efficiency.

(1)we are not speaking of an atkinson cycle engine
(2) delta of calculated load under similar conditions DOES reflect the actual difference in fuel consumption assuming the system is operating at stoich , so yes
(using a wee bit of common sense )
you can use calculated load value for more than VE values
and
calculated load will NOT be 100% at all rpm and load conditions even at WOT

for example
look at calculated load with no throttle input and nothing running except the engine ,
then switch on AC and set heater blower to max , switch on hi beams
calculated load will increase significantly ,
simple math will show how much more fuel is used with accessories running or not running .

(2) if peak pressure at TDC is not an indication of how well or poorly the engine system can pump air what is it showing then ?
no intent to start a pissing match here -

(4) EGR is used on many engines used by people in this forum
EGR works to improve FE - EGR degrades thermodynamic efficiency -


we can measure VE

we can use calculated load for many things , including showing an under reporting MAF sensor - these are just distractions , i am attempting to focus on what is in bold