This Excel software is a completely new and unique
approach to parametric cylinder head design. The model is an interactive
user friendly design with up to 3 different bowl surfaces using cell
inputs and spin buttons. The calculations and geometrical updates are
performed instantly and interactive.
Cells that are changed often when adjusting the design have small spin
buttons for +/-
increment change. The changes becomes more interactive and user
friendly by less keyboard inputs. By default, the squish band angle is automatically optimized
for any given head parameter. Custom squish band angle can be chosen for
special user needs simply by clicking a checkbox and entering a custom
value. Help windows with definition of the parameters are embedded,
accessed by buttons. Plenty of internal recommendations guides the user
towards good working and solid designs.
head is designed with respect from
maximum squish velocity, compression
ratio, squish band dimensions and mechanical strain.
The very unique 'Strain' function takes all material
strain into account, (e.g. crank bending, bearing gaps, etc.) which affects the
piston TDC location relative the head, thus squish gap and squish velocity.
This is a sensitive and maybe the most critical variable when
designing a race head for optimum combustion. Since the crank and
other mechanical parts are stretched during increased rpm, there will be
different squish conditions at high and low rpm for instance. The button
MSV-rpm will show a chart with Maximum Squish Velocity vs. rpm from low
rpm to 25% above target rpm in order so show the consequence of over-rev
dependent on your total strain at target rpm. See the manual about how
to use this feature in the correct way.
Some theory about cylinder head design is presented in the 'Theory' link
in the menu. Read about all the features and details in the user manual at
the page bottom.
The program also has language support !
MS Windows with installed MS Excel 2003
or later except any trial- or student version.