Dyno Fail

[piezzi]

I'm no professional, but this short video could be used as an instructional how-not-to-dyno-piece.

And if you're the heavy handed dyno operator, what do you say to the engine owner after this ordeal? "Well uh...look on the bright side, your video is bound to go viral on youtube......"

Dyno Catastrophe - YouTube

 

[Awk08]

that was probably at kennedy's shop

 

[vspec]

60psi later......

 

[slickerthanyou]

that was probably at kennedy's shop

Ya beat me to it!

 

[pittboss45]

Actually had that happen when we took another builders motor with us to the dyno, just not that bad.

 

[super noober]

whoopsies!!! lmao

 

[myusername]

That poor 12v cummins....

haha it blew the head right off the block. now thats alot of boost

 

[sicivicdude]

At 17 seconds something changed.... the flexhaust running to the outside began to buckle. I'm not sure if they switched it from regular to "hi" fuel right then or what but whatever happened, it found the weak link.

Better get some better head studs next time bud!

 

[manson6]

Wow, I had a 2002 24 valve cummins and was running 22lb boost impellor and a bully dog programmer with straight 4 inch exhaust, that thing would sing like a freightliner, Wouldnt dare go up to 60psi. Was pushing almost 500hp on the dyno. The reason the exhaust tube buckled was probably the turbo spooling up real quick.

 

[myusername]

i run 30-35lbs of boost in my 12v. they can handle it. i can tell you with that huge turbo, and that intake manifold, he is running way more than 60lbs of boost. I can't see another turbo on there, but i assume they are compounded, because there wouldnt just be one turbo mounted all the way up front like that. To run a manifold like that, you have to have your head machined, and with that cost, i'm sure he is also running head studs. Probably just not big enough.

 

[sicivicdude]

i run 30-35lbs of boost in my 12v. they can handle it. i can tell you with that huge turbo, and that intake manifold, he is running way more than 60lbs of boost. I can't see another turbo on there, but i assume they are compounded, because there wouldnt just be one turbo mounted all the way up front like that. To run a manifold like that, you have to have your head machined, and with that cost, i'm sure he is also running head studs. Probably just not big enough.

It doesn't LOOK like a compound setup. Looks like a huge single, probably for a pulling truck or pulling tractor in a particular class.

Oh, I would imagine that engine had every bell and whistle fastener money could buy, my comment was more "tongue-in-cheek" than anything. I generally refrain from sarcasm on the internet as it doesn't always come through properly. I apologize for that.

Actually, it looks like right after the exhaust tube buckled funny black smoke started shooting out of the flange where the turbo bolts to the manifold and fuel started shooting out of the fuel pump . I imagine the pump disintegrated and went to full fuel trim.... runaway diesel..... it was a bomb at that point. Nothing the dyno operator could or would have been able to do.

 

[piezzi]

Stronger headbolts were definitely needed, but with all the warning signals coming from that motor.......seems like the operator should have shut that thing down. Plus, you're not likely to get good dyno results from a room full of smoke :-/.

 

[sicivicdude]

Stronger headbolts were definitely needed, but with all the warning signals coming from that motor.......seems like the operator should have shut that thing down. Plus, you're not likely to get good dyno results from a room full of smoke :-/.

Dynomometer's simulate load conditions at the flywheel by resisting torque. If the engine "runs away" the dynomometer operator has two options, throw 100% of the possible applicable torque to the engine and hope to stop the engine by choking it down mechanically or let off the torque completely and hope the engine doesn't run to the revlimiter and blow. So basically, the operator has 0% or 100% load to choose from.

In a run-away situation, an engine like that is toast either from failed headbolts (or block or rods or cams etc...) or blowing rods through the side of it after it bounces off the mechanical governor (or valve float if the mechanical governor has been altered or piston wall speed exceeding the oil films ability to lubricate) long enough.

 

[myusername]

It doesn't LOOK like a compound setup. Looks like a huge single, probably for a pulling truck or pulling tractor in a particular class.

Oh, I would imagine that engine had every bell and whistle fastener money could buy, my comment was more "tongue-in-cheek" than anything. I generally refrain from sarcasm on the internet as it doesn't always come through properly. I apologize for that.

Actually, it looks like right after the exhaust tube buckled funny black smoke started shooting out of the flange where the turbo bolts to the manifold and fuel started shooting out of the fuel pump . I imagine the pump disintegrated and went to full fuel trim.... runaway diesel..... it was a bomb at that point. Nothing the dyno operator could or would have been able to do.

sorry, i wasn't trying to call you out or anything if it seemed that way.

I guess i should have looked a little harder. that is just a huge single. It's just unusual to see a single turbo mounted up front like that on a cummins. But after examining the slo-mo part of the footage, its just a custom exhaust manifold i believe.

The only reason why i said what i said wasnt to be a smart ass or anything. i just know that Haisley machine(? if my memory serves me correctly, it is them) does machining on the heads so that they will accept a bolt on type intake manifold. And if i remember correctly, it was well over a grand just for the machine work, and the manifold would be probably the same cost if not more. I couldnt imagine spending that much and not installing head studs. It is probably a 13mm or a built ag pump on that engine, which will fuel rediculous amounts compared to a stock pump.

And in the other post, if i read right, someone stated they put down 500hp at 22lbs boost on a 24v. I can push 35psi or even close to 40psi out of my stock hx35 on my 12v with no problems, but it will probably grenade the turbo if it holds that psi for a decent period of time. And my fuel pump is mildly built. and i dont mean that by my fuel plate was removed and smoke screw turned way up. DPE actually rebuilt it and did some work inside the pump so that it will fuel harder, and we actually tuned the AFC. And i will tell you, my truck puts nowhere near 500hp down. probably like in the 250 range. I know, this isnt comparing a 24v to a 24v or a 12v to a 12v. I'm just simply stating that i would like to see a dyno sheet to believe 500hp on a tuner and 22lbs boost

 

[sicivicdude]

sorry, i wasn't trying to call you out or anything if it seemed that way.

I guess i should have looked a little harder. that is just a huge single. It's just unusual to see a single turbo mounted up front like that on a cummins. But after examining the slo-mo part of the footage, its just a custom exhaust manifold i believe.

The only reason why i said what i said wasnt to be a smart ass or anything. i just know that Haisley machine(? if my memory serves me correctly, it is them) does machining on the heads so that they will accept a bolt on type intake manifold. And if i remember correctly, it was well over a grand just for the machine work, and the manifold would be probably the same cost if not more. I couldnt imagine spending that much and not installing head studs. It is probably a 13mm or a built ag pump on that engine, which will fuel rediculous amounts compared to a stock pump.

And in the other post, if i read right, someone stated they put down 500hp at 22lbs boost on a 24v. I can push 35psi or even close to 40psi out of my stock hx35 on my 12v with no problems, but it will probably grenade the turbo if it holds that psi for a decent period of time. And my fuel pump is mildly built. and i dont mean that by my fuel plate was removed and smoke screw turned way up. DPE actually rebuilt it and did some work inside the pump so that it will fuel harder, and we actually tuned the AFC. And i will tell you, my truck puts nowhere near 500hp down. probably like in the 250 range. I know, this isnt comparing a 24v to a 24v or a 12v to a 12v. I'm just simply stating that i would like to see a dyno sheet to believe 500hp on a tuner and 22lbs boost

.

No, I was simply stating that I was making a joke about needing head studs. Obviously, with all the other work done to that engine I would CERTAINLY hope the builder didn't skimp on headstuds.... I would imagine this was a failure of the governor to a "WOT" setting which led to its untimely demise. Not even sure of the mechanics of what would need to happen for a mechanical fuel injection pump to fail in such a way it started throwing "WOT" fuel to an engine but that's what it looks like.

500hp out of a "street" diesel engine is practically unheard of. That's probably a number someone got from the tuning company (which of course is in their best interest to inflate their figures)

Hp = T(ftlb) x F(rpm) / 5252

So you figure a "street diesel" might rev up to about 4k rpm before it's all done (valve float and volumetric effeciency will cease to produce power above a certain limit unless the engine is specialty prepped). In order to reach 500 hp it would need T for torque:

500 = T x 4,000 /5252

500 x 5252 = T x 4000

2626000 = T x 4000

2626000 / 4000 = T

656.5 = T @ 4k rpm.


NOW, the 2011 Ford super duties have the new 6.7L "scorpion" engine is said to produce 400hp (@2,800 rpm) and 800 ftlbs of torque (@1,600 rpm). I am VERY dubious this will last very long as a production run.... the architechture of this engine means maintenance (especially after a couple dozen thousand miles) will be a total biotch. Ford might love it, but I believe ford owners will not...