Current version: 2.5.1
Update info. 

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 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. The 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 deflects during increased rpm, there will be different squish conditions at high and low rpm for instance.

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 has language support !


System requirement:

Any system with installed 32bit or 64bit MS Excel 2003 - 2016
except any trial versions.

Disclaimer: Print preview in Excel 2016 does not work properly. It relate to an Excel bug that can not be corrected in the Bimotion program. The program also runs slower in Excel 2016.

The different geometries can be defined according to:

Hemi-sphere: radius origin is located on vertical axis


1-Stage: radius origin is displaced from vertical axis

2-Stage: radius origin is displaced from vertical axis + flat roof

3-Stage: First radius origin is displaced from vertical axis + second bowl displaced from vertical axis + flat roof.

Click for larger view !

The program calculates all output data and updates the geometry instantly when new input data are entered.


Any geometries can be modeled as long as the curves can be logically aligned by the dimensions.


The program has a design table for cad modeling, this is very useful for NC manufacturing and Fluid Dynamics (CFD) calculations. When the excel sheet is changed, the synchronized cad model will update !


 Download the user
 manual,click a flag.

You need Adobe Reader to open the manual.




Buy now !
Fast delivery by e-mail


US $: 133.00

Order is to be placed from Contact in the menu.
Please specify program, Excel version
(2003-2016, 32 or 64 bit)
You can check your version in the Contact page.