rtfoe
SMF Supporter
I just realised why there is s spine. These were on early Mks of the Spitfire. Later RR engines had a box like thingy in the way after the cam shafts so the spine was removed I think. The later engines were even busier at the top and plumbing different. Many versions which I just found for all types of aircraft from the Lancaster to the Mosquito.Richard,
top view of a Merlin III......................................
View attachment 421895
The Merlin has two spark plugs per cylinder - one on the inlet side, the other the exhaust...................
Dave
Cheers,
Richard