ORIGINAL: ifixairplanes
I used the rcu engine comparing thing and it shows that both have a bore of .866" but the 50sx has a longer stroke of .85" when the 61fx has a stroke of only .77". how can that be? the 61 has more displacement, if they have the same bore, then the 61 needs to have a longer stroke, am i right or wrong?? i dont know. maybe its just a typo. anyone have any input? kinda confusing me.
They're both oversquare designs. Either you have simply misread or the engine comparing tool has erred.
The
61FX has a
stroke of .
866in (22mm) whereas the
50SX has a
bore of
.866 (22mm) is possibly how the confusion arose? The bore of the 61 is larger at .946 in (24mm) as one would expect. Though both are short stroke designs, the SX is closer to square with a stroke of .847in (21.5mm).