Reckon that I could shoe-horn one of them into our VW Caddy van.
Emissions might be a problem though!
Starting procedure is a pain though .. if you watch the vid you'll see how he turns it over a fair few times before allowing it to fire .... normal procedure on a radial engine as the lower cylinders have a tendency to fill with oil if left standing ... The Rolls Royce Hercules Radial (18 cylinders in 2 banks of 9) fitted to the Vickers Varsity - that I did my basic training on - had a decompression device that you operated and then turned the engine over 9 complete revolutions in order to expel any oil before making any attempt to start it !!
What happens if you dont dump the oil Is that why the one in the clip was smoking for a bit .
At worst .. a hydraulic lock in the cylinder which put simply .. wrecks the engine totally
At best .. yup a very smoky engine as it burns off ..
You might think the hydraulic lock would simply stop the starter turning the engine .. but the problem is, without the decompresssion device being activated any one of the other 17 cylinders might fire, and the engine tries to run with one cylinder full of oil .. just doesn't happen and the cylinder head flies off and/or the crank gets bent, as well as much ancilliary damage ...
And before anyone asks .. NO .. I never did it ... I did several other stupid things .. but never that one !!!