User Guide

38—Dyno2000 Advanced Engine Simulation
The liquid volume dispensed from the burette is entered in field (5) Volume Above
Piston . The difference between this volume and the volume of a simple cylinder [of
a height equal to the value entered in field (4)] is the Deck Volume At TDC , a volume
equivalent to the sum of the dome, dish, and relief volumes of the piston.
Note: A negative Deck Volume At TDC indicates that the dome reduces the com-
bustion space and will increase the compression ratio over a flattop piston. A positive
value indicates that the sum of all dome/deck/relief/dish volumes will increase the
combustion space volume and decrease the compression ratio over a similar flattop
piston (with the same deck height at TDC).
Measuring Dome/Deck Volume
Measure the volume above the piston while
the highest portion of the piston dome is
positioned below the deck surface. Enter this
value in field (5) Volume Above Piston. The
difference between this volume and the
volume of a simple cylinder [of a height equal
to the value entered in field (4)] is the Deck
Volume At TDC. This volume is equivalent to
the sum of all the dome, dish, and relief
volumes of the piston. A negative Deck
Volume At TDC indicates that the dome
reduces the combustion space and will
increase the compression ratio over a flattop
piston. A positive value indicates that the sum
of all dome/deck/dish/relief volumes will
increase the combustion volume and decrease
the compression ratio over a flattop piston.
Induction Airflow Menu
The Induction Airflow menu establishes
the airflow restriction for the induction
system and the pressure drop at which
the airflow is measured. For the pur-
poses of the simulation, everything
upstream of the intake ports, including
the intake manifold, carburetor/fuel-
injection system, venturis, any super-
charger or turbocharger, and the open-
ings to the atmosphere is considered the
induction system. The Airflow menu
consists of four 2-barrel-carburetor
selections and thirteen 4-barrel-carbure-
tor/fuel injection choices. In addition,
you can directly specify the rated airflow
from 100 to 3000cfm and the pressure
drop at which this airflow is measured.
Induction Airflow Menus