Jeez, sorry about this, will I ever stop talking :-)
For thise interested there are pictures that I have posted on this forum in an effort to identify it. I am sure it is an avenger mark II but couldn't say for certain. The motor is an aircraft motor with a 'shim'/'shroud' around the head that trandfers the heat by the water feed.
The link is :
http://www.rcuniverse.com/showthread...64#post1154171]