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I'm looking at buying that to replace my bad 3.3 and 2.5. i was able to find one cheap.... what do you guys think.....
Sorry for just throwing up a video, when I'm in the shop I only have a mouse and no keyboard... The engine may be fine for a monster truck, but high revving it was done after 10 tanks including the 5 break-in tanks. The metal ball retainer let go and went through the engine, most have a plastic retainer for this reason. I would seriously consider replacing the main bearing fairly soon with a higher grade and quality piece. I have also heard of others having the same issue, but after a bit more fuel has been run through lol.
Really though, if you expect a $100 engine to do long WOT pulls over and over, then you probably expect too much. From how it sounded and the speed it was putting out, still sounds like it would be worth the $ if you dropped in a new rear crank bearing upon purchase.
Dynamite engines tune really well and last a pretty long time. I've seen/had quite a few over the years and never had one grenade a bearing like that.
However, I've had a few OS 21 RG's have catastrophic failures, one of which busted a bearing and it wasn't that old either. It did have the plastic retainer.
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The other snapped a crankshaft at the intake journal and I witnessed two others blow con-rods in under a gallon. Those were OS's! Didn't stop me from buying OS though.
I do fully agree that a new bearing should be swapped in new or just after break-in before you really make it start working. I would look for a good steel bearing with a plastic retainer, at least you have a chance if the bearing starts to let go. This one went fast, it went from a solid 54mph to 52mph in one run, the camera was filming for every pass I only did maybe 6-7. Like I said in my reply, in a monster truck where rpm is limited in comparison to the jato, it should be ok. The engine is totally stock with just a good pipe on it, anyone thinking of putting it in such a vehicle will likely suffer the same outcome, because what else can you do with a jato except for going really fast, in a straight line lol.