This is what engineers call a "catastrophic engine failure". We mechanics call it an "aw **it". For those who don't know, a dynomometer is a device used to place a load on an engine to determine horsepower and torque. It's used to test engines after overhaul to ensure it will perform at it's peak after installation. This is a Mercedes Benz large bore industrial diesel...

Told ya not to go to Jiffy Lube.

Was this dyno pull to see what could happen? Or was it just a normal hp and boost test that went wrong? It looks like a turbo or head gasket fail. All though I cant tell from that angle.

Was this dyno pull to see what could happen? Or was it just a normal hp and boost test that went wrong? It looks like a turbo or head gasket fail. All though I cant tell from that angle.

It may have been intentional. Engine manufacturers purposely blow up engines to determine the limits of various components. The parts are then analyzed to see what the root cause of the failure was. This helps them build things better and helps them down the road when warranty claims are made.

What makes me think this may have been intentional is the fact they video taped it. Most dyno runs are not taped but rather recorded onto a file, where temperatures, pressures, hp, boost, etc. are saved.

I doubt it was a head gasket as the bottom end is what grenaded on this one. The RPM drop before the explosion was likely the rod or main bearings melting down.

Yea I think your right now that I watch it again. If that was the case what was with the water or fuel coming out of the engine?

I'm gonna have to show my students that one they like that stuff engines blowing up trucks pouring tons of black smoke fun diesel stuff

most likely the liquid coming out of the bottom was a mixture of oil and anti-freeze/water. There are many areas of an engine where the water jackets are very close ( cylinder bores, intake/exhaust ports) and with a rod failure, be it bolt or bearing, things get slung around at such a high rate of speed, I speculate some broken part busted a hole in a water jacket and therefore you see oil/antifreeze/water mixture!

Jeff

Clean up in aisle 7

Looks like a a head gasket failure at :26 when they ramped up the rpms, causing catastrophic failure later. The "liquid" is water/antifreeze mixed with oil. I'm somewhat familiar with that ugly sight, LOL.

Distressed commuter: "Can you tell me what the problem is?"

Hillbilly mechanic: "Yep, lessee here, HMMM, Amma thaynkin' she's broke! Yep, she's broke!"

That's a BOOM!