How about this for a kit: Smallest V12 engine (hand built)

[Asher]

I prefer this one, it actually sounds the business

[Fast Eddie]

lol thats the one I just posted on the 1st page..

[KiWiP]

Then at the other end of the scale. Apparently the ground shakes when it runs

[sleemanj]

I've seen that video before, the work is to be admired, but you know, if I was going to that trouble, why wouldn't you actually make one that was functional rather than compressed air driven.

Like this one for example:
[youtube]mutb7KgA9NM[/youtube]

[Berries]

Must have taken him bloody ages.

Going on the size of the pistons and the fact that it only ran on compressed air I'd guess somewhere around the 1,220 hours mark.

[unstuck]

Then at the other end of the scale. Apparently the ground shakes when it runs

I would love to run that in my driveway at about 5 in the morning.

[cheshirecat]

Mentioning of memorable engines, the one that still stands out is hearing a 1970's MV Augusta start up. Straight cut gear driven cams sounding like the worlds most sophisticated gravel crusher until it fired up pinning my 70's flares back with those straight thru four exhausts

[Fast Eddie]

Then at the other end of the scale. Apparently the ground shakes when it runs

haha thats mint, it was blowing perfect smoke rings out the exhaust heaps haha...