ORIGINAL: KrazyKen
Thanks for the thoughtful replies guys...much appreciated.
My engine does not have a shim. It does have the 7mm carb.
It does not squeak when turning the prop with the glow plug out, and it does not have much resistance when doing that. However, with the head off and turning the prop, the liner will grab at the top of the stroke and move up about 3mm.
Any ideas on where to get parts (piston/liner/rod)?
Thanks,
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Your engine seems OK to me. Try the "grab condition" with a dry liner, so the oil film will not obscure fit issues.
You are comparing the tamest MVVS version, heavily muffled with probably a more competetive Rossi setup. This A-type muffler is a real power robber, though quite silent.
Your compression measurement indicates, that you may want to go up in nitro a bit.
Like Dar said, using the mini tuned mvvs pipe will bring the engine up to par, best combined with a smaller prop. (pitch)
The lower pitch will allow the engine to go up in revs, which is not restricted by the A-muffler.
I never tried to get the most of a .47 with this muffler, so maybe Dar can shed more light on this, because my experience with the A-type is mainly restricted to the combat series engines. These engines rev up quite a lot once airborne. Since a hover condition is something else, you must allow for that with pitch.