.28 and below, most rules. notice how people are blowin out the collari 30 to get rid of it.
ur title and intentions of this thread started out as a good motor thats not to expensive, easy to tune, and decent, but not gross, power.
now ur up to which nova .28 u want.....what gives. each track i run at now, i can't utilize any of the power those engines have. have guys here w/nova and rb .28s, picco 27s, wasps, and 24.7s and their all a waste b/c u can't exploit the power. even if u have a tight track, unless its got unlimited grip and u have a handle on ur driving, would u utilize it. most tracks have lil grip, so spinning wheels, traction loss and spinouts from early throttle app would see the expense wasted.
not to mention those motors are not cheap to rebuild or replace. my 25MTs retail at 250, i get them on ebay from time to time around 125 new. i can get a new p/s for them around 50bux, and all the others parts are readily avail and cheap. make good power, but also be able to control it (still need a restrictor w/it ideally).
this 1 track i'm gonna start racing on, so tight and slippy i might put a bigger bell on w/a good sized restrictor and slow down the radio action all to keep it inline.
just thoughts, good luck w/whateva u get. thought this might shed some light on things.
-Ult