Renwal's Visible V-8 Model Engine Kit

Remember this baby? Always wanted one, never got one, might have to score one now. DiscoverThis.com sells the classic Renwal engine model here.

Here's the DiscoverThis description:

The Visible V8 engine kit includes How an Auto Engine Works - an illustrated guide to the Visible V-8 Engine as well as an instruction booklet. Turn the hand crank and watch as the interior engine parts move! What better way to see how an internal combustion engine works than to be able to see all of the parts move! As you turn the crank at your own speed, each of the parts move, just like the real thing.

Check it out.