RE: New Engine Break In
It is obvious , not everyone uses their engines in the same manner.
also - the industrial engines which are in a shroud with a forced flow - run cooler (or at a more constant temp)-
Sticking these things , (with out forced flow shroud)in the front of some models STOPS correct flow thru the fins. the air just skates around or stagnates.
getting this right in gassers is seldom done.
On motorcycles -look at the relative fin area on a 100cc bike and on a 100cc model engine-- totally different ballgame
and there is also a whopping difference in total case/crank you name it mass.
Personally I fly NO conversion engines - all are purpose built from square one -but that's my choice - Ido believe a GOOD conversion engine typically has piston n sleeve which will cool better - tho the rest of the setup typically does not appeal to me.