Am10 rebuild

As your all aware I'm rather fond of ancient, oily and tricky to handle diesels....recently in the depths of Facebook market place I found a chap selling a few engines local to me, needless to say I popped over to him and bought them, first one was a DC sabre ( 1.5cc) nothing special but it ran well and more importantly to collecters it had a unmarked box and it's original paperwork.

I gave £15. for it but have since sold it on to a guy in Liverpool for £50!!
The other engine was a utter mess, gummed solid, snapped conrod ( due to the owner using pliers on the prop driver to attempt to free it off...prop driver was quite chewed up)

three days soaking in meths followed by a good bake in the oven had it apart then it was just a matter of cleaning it up using my secret witches brew, a lot of fettling and a new conrod supplied by a fellow oily friend resulted in this..
It now runs a dream, it's one of the more powerfull plain bearing motors from back in the day and its very light, guy i got from had had it from new in 1966!

Forgot to add it also came with its original box, instructions and optional silencer ( apparently ultra rare as no one ever bothered with them).
The tank is also new and unused as it only ever flew in a control line model then spent 40 years sitting in a saucer of fuel on a window sill, explains why the bore and crankcase where completely filled with solid castor!!

paul
As far as I remember no one used the silencer (thus ultra rare) as it cost quite a bit of performance which was after all the AM10's "raison d'etre".

The AM10 uses a significant (and 360 degree!) sub piston air induction at TDC so any exhaust back pressure means it draws in exhaust fumes rather than air which takes a good chunk off the performance.

I am not sure about 'very light'.
The comment at the time was although nearly as powerful as a 'normal' 1.5 cc it was also just as heavy.
This was rather born out when AM produced the 15. A true class leading power for exactly the same overall size, weight and mounting holes as the 10! To make matters worse the AM 15 was only 1/- (5p) more.
Still a fascinating engine.

The 1.5 was built on the bottom end of the 1cc ( the 2.5 used the same bottom end as the 3.5) it weighs 3oz which is fairly light compared to other engines of the period.
I agree about the exhaust although its not really 360 degrees

...without measuring the port webs it's probably safer to say "radially ported"!