ORIGINAL: NM2K
No, my advice applies only to the AAC equipped engines that were sold by Enya some time back. These days, the CX engines are made with ABC piston/liner combinations, which means that you treat them as ABC engines and not AAC engines. To the best of my recollection, the SS series of engines did not use AAC or ABC technology. I do have a ringed SS .50 that looks very nice. I haven't ran it as yet.
Ed Cregger
The SS series engines are a mixed bag of metallurgy, so you need to know which one you have, and some were available in more than one configuration.
To the best of my knowledge :-
SS15 - ABC
SS25 - iron/steel and AAC versions (I'm assuming the SS25 Al-Chro is AAC)
SS30 - iron/steel
SS35 - not sure - aluminium, ringed?
SS40 - iron/steel
SS45 - not sure - aluminium ringed?
SS50 - ditto
Looking at the current Enya catalogues, they seem to have a mix of iron/steel, AAC, ABC, ABN and ringed engines at present. My older ringed enyas (eg. model 6001 45BB) have aluminium piston, not sure about current.
Col