I had a 21 eb mod that was a monster. I loved the enging but didnt have patients when I flipped and was over revving engine and the rod broke. I have a 24 that I had to get used to driving and I love it now. I love the power and the run time that it have with the big boy pipe. It have a muscle car type of sound to the 24 that I love. I just brought another 24 eb mod 2 days ago and I have another 21 eb mod in the box.
All I can say is that I havent had problems with it. My friend saw my 24 run last season and he got one for this season for his losi 8t 2.0. I havent experience the problems these guys are. Like I said the rod broke from user error but not other problems. Idle fine and temp was 220 on the 24 and 209 on the 21 eb mod.