Is an animated display of an internal combustion engine.  There are 3 different types of engines that are selectable by holding down the mouse button.  The 3 different types are Flat4, Inline4 and V6.  The default is the Inline4.

This program uses 3 animated gif images from a article on HowStuffWorks.com to and measures the current frame rate that can be displayed. 

[http://www.interq.or.jp/japan/s-imai/tcltk/images/tkengine11.gif]

Version 1.1 is avaiable here [http://www.interq.or.jp/japan/s-imai/tcltk/download/tkengine11.zip].
 # TkEngine Program V1.1
 # by Satoshi Imai
 # 1.1, 07-Jul-2002 modified by Fuhito Suguri
 # http://www.interq.or.jp/japan/s-imai/tcltk/tkengine.html 
 # Based on a article by Marshall Brain @ HowStuffWorks.com
 # http://www.howstuffworks.com/engine2.htm

The Homepage for tkEngine [http://www.interq.or.jp/japan/s-imai/tcltk/tkengine.html 
] is in japanese but a translated version is available through bablefish here [http://babelfish.altavista.com/babelfish/urltrurl?lp=ja_en&url=http://www.interq.or.jp/japan/s-imai/tcltk/tkengine.html].
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[MPJ] A reformated version with the frame/sec in the title bar and scale to fit the [PocketPC] is available here [http://mywebpages.comcast.net/jakeforce/iTkEngine.tcl].  Note you still need the 3 images from the above version: flat4.gif, inline4.gif, v6.gif.

Here are the shots of it running on my Dell Axim (arm 400Mhz)

[http://mywebpages.comcast.net/jakeforce/tkengine_off.jpg] : [http://mywebpages.comcast.net/jakeforce/tkengine_on.jpg]

And here a picture of this code running on my desktop (1GHz ~ notice the frame rate differance in frame rates).

[http://mywebpages.comcast.net/jakeforce/tkengine.jpg]