ORIGINAL: Hobbsy
Hey Mikester, Fox made a few engines that came in both ringed and non ringed. I don't have any non ringed fourstrokes, just Saitos, Enyas and the LASER .70. I sold my OS .52 a few weeks ago.
Since this is kind of about engine piston to cylinder seal, my PAWs are steel in steel and my Fox .25 is Meehanite in steel, the PAWs might be too. None have rings. On the PAWs and the Fox 25, you could hold them against compression all day and they will not leak down.
Stand down, Hobbsy. We're not fighting the civil war of model engines!!!
I just bought a pair of Magnum .52 RFS (four-stroke engines - so much for thread drift) at their low price. I'm planning on building a few multis. Four-strokes have their own sound in that particular mode.
However, I'm still buying two-strokes too. I miss ringed two-stroke .40 sized engines (or thereabout), but the ringless Enya .40 & .45 CX engines that I have are holding up amazingly well.
Maybe I'll get the NIB .50 & .61 CX engines running this year. Maybe...
Ed Cregger