Cummins (modified) blows up on dyno @2:45

[ctechbob]

Ohh yea, forgot to mention. These guys are turning these engines in the 5000 rpm range, and water/nitrous injection. Super silly type of stuff. One of the events they do has 3 parts, Dyno, drag, and pull. Lots of those guys build and swap engines for each phase. The dyno engines are super weird beasts with compound turbos with the nitrous/water.



There's a decent look at a billet block motor. Looks to me like it is one of their drag motors, not sure though.



And another

 

[loneryder]

Those rednecks ought to be arrested for polluting the environment.

 

[ctechbob]

That's not a runaway, THIS is a runaway

 

[clinebarger]

They're polluting more than other forms of Motorsports??

 

[ctechbob]

They're polluting more than other forms of Motorsports??

Was gonna say, that's just carbon, not great for you, but better than the leaded fuel NASCAR ran up until a few years ago, or two-stroke oil that gets released into water from boats.

 

[nthach]

I skimmed an article about that. Too much nitrous oxide. NOS is just a brand name for a NO system. Now I got the Fast & The Furious stuck in my head.

 

[ctechbob]

They actually did a teardown of that Duramax runaway. To keep with forum topics, they said they are running 20W-50 oil in that engine. It shockingly doesn't look all that bad. It never came apart and the only real issue I heard them talk about was some slight bearing damage and some areas where the pistons kissed the heads. At the very end they show the rod assemblies, I think you could probably use those for lifting a bridge off its foundation.

I'd never heard of the oil:

http://www.cen-pe-co.com/2019/index.php

 

[ARB1977]

Trumps fault, lol.

 

[Strokenmerc]

If you watch a few seconds before the fireball, it appears the dyno unloaded in a puff of smoke. I'm have near zero knowledge of diesels, but I assume if the dyno unloads it would allow the RPMs to spike, possibly causing the destruction.

 

[ctechbob]

Finally got to do some googling on the explosion. Looks like it was a simple matter of too much nitrous trying to stretch for 3000hp on the dyno.

Here's the plot of their first run.

And here's the owner explaining the build for anyone that wants to know how they build these goofy things. Of note...its a stock Cummins crankshaft..