2nd Blown Modified GT500? This time it's Stangmode with Hulk!

[Dominant1]

Since some of us here won't watch his crap. Is this his "expert" analysis of what happened or did it come from someone that actually knows what they're talking about?

The guys at l&m determined the failure. His heads can be re-used and the cams are ok. he’s getting a sleeved block with stronger rods built by l&m.

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[IamCDNJosh]

Root Cause ≠ Failure

 

[Snakecollector]

Root Cause ≠ Failure

Exactly. Root cause still hasn't been determined IMO. To say 'oh well the rods bent because they can't take the power' is being a simpleton.

 

[K4fxd]

Exactly. Root cause still hasn't been determined IMO. To say 'oh well the rods bent because they can't take the power' is being a simpleton.

Go to 11:23 in the video and watch for about 10 seconds. He picks up the piston with the bent rod and says "it knocked"

That is what started it. No mention of the reason it knocked, hence my speculation of having 93 pump put in the tank with the E85 tune still installed.

 

[markmurfie]

Go to 11:23 in the video and watch for about 10 seconds. He picks up the piston with the bent rod and says "it knocked"

That is what started it. No mention of the reason it knocked, hence my speculation of having 93 pump put in the tank with the E85 tune still installed.

He was asked "wouldn't you be able to tell you had bent rods?" He was showing a rod from an GT350 as an example. AT 11:32 he says it made a knocking noise, meaning engines can still run with severely bent connecting rods. Some you might hear and other you would never know.

He was not saying that what caused that rod to bend was detonation(knock). They said the engine was making power beyond its capability(determined from every rod not snapped in half being bent) and one of them just eventually failed taking out the one next to it and the oil pickup tube (but by that time that engine probably already had a window in it so it didn't really matter).
At 12:00 he even says they bend ever so slightly, then weaken over time.

They also said one side of the engine got hot(indicated by the head gasket coolant passages).
That looks like it was a lot hotter than the other side. Oxygen sensor failure on one bank, bad luck combined with the bent rods? I've seen it happen in data logs before with no CEL. E85 kills 02 sensors all the time. To me its plausible.

 

[CJJon]

Seems like it ran lean one too many times. Does he have a return fuel system or does that come stock on the 500? I didn't see any regulators or gages under the hood.

I heard he traded for a Mclaren or something like that. Same payment supposedly...

 

[olaosunt]

what kind of rods are in the predator ?

I ended up with couple of bent rods(below) in the OEM voodoo in my GT350/whipple-12-13 psi/running race gas ....and had been having issues with 02 sensors before .

I definitely heard “knocking“ as the piston made contact with the crank .

Engine rebuilder said there was also evidence of head lifting/head gasket failure on the side of the bent rods, so may be resulting in “hydro lock “

 

[markmurfie]

Looks the same to me.

" Both power units feature forged-steel connecting rods (though beefier in the GT500) "

https://www.motortrend.com/cars/for...-shelby-gt500-first-drive-changes-everything/

"Forged-steel I-beam connecting rods"

https://www.cjponyparts.com/resources/ford-predator-engine

" Bigger connecting rods get thrown in as well, which are made from a “micro alloy steel” as is the crankshaft. "

https://www.autoweek.com/news/a2145946/2020-ford-shelby-gt500-more-engine-details/

" Notably, it is upgraded with stronger cylinder head bolts, has an improved cylinder head and block structure to handle the increased pressure, new head gaskets with more active layers, a revised cooling system, stronger connecting rods, forged pistons, and enhanced lubrication and piston cooling. "

https://tflcar.com/2020/10/ford-mustang-gt500-closer-look/

"Forged steel cranksha with cross-plane firing order and micro-alloy forged connecting rods add strength "

https://media.ford.com/content/dam/...ca/US/2019/08/05/GT500-Engine-Infographic.pdf

 

[Dominant1]

Seems like it ran lean one too many times. Does he have a return fuel system or does that come stock on the 500? I didn't see any regulators or gages under the hood.

I heard he traded for a Mclaren or something like that. Same payment supposedly...

he had the stock fuel system with 933 whp. He’s not getting a Mclaren he just drove a friend of his car.

 

[protraxduner]

I still have the same question what was the real problem? From the video I gather too much HP and rods are weak point. Yet many are at similar power so are they all destined for doom?

So did the bent rods cause the failure or the failure cause the bent rods?

 

[K4fxd]

It may be weak rods, Ford has built engines with weak rods before.

I kinda doubt it however, I mean the GT500 is designed to be a race car and they did strengthen the rods for it.

I still think it was heavily into detonation and that caused the broken piston and bent rods. Like Mark said an O2 sensor could have failed since one bank was obviously run hot.

 

[CJJon]

he had the stock fuel system with 933 whp. He’s not getting a Mclaren he just drove a friend of his car.

I just saw the clickbait title regards the Mclaren.

I vote lean runs with the stock fuel system that just couldn't keep up with the demands of all that HP. Everything else is just a symptom.

Sucks to be him for sure though. I am getting ready to supercharge a 2020 GT that doesn;t even have 500 miles on it yet. I plan to keep things well under 800hp though and will install a tony dual-pump return fuel system.

 

[K4fxd]

I vote lean runs with the stock fuel system that just couldn't keep up with the demands of all that HP. Everything else is just a symptom.

I think if it was a fuel delivery issue both banks would show signs of running hot.

 

[CJJon]

I think if it was a fuel delivery issue both banks would show signs of running hot.

Both banks had piston failures. Perhaps the fuel starvation wasn't equal on all cylinders. Heat damage is often not consistent as well. Something caused the failures and I am not convinced it was too much power. The stock guts are pretty good.

Running that much boost on E85 withouht a return fuel system is a gamble though.

 

[Snoopy49]

Both banks had piston failures. Perhaps the fuel starvation wasn't equal on all cylinders. Heat damage is often not consistent as well. Something caused the failures and I am not convinced it was too much power. The stock guts are pretty good.

Running that much boost on E85 withouht a return fuel system is a gamble though.

The mechanic in the video said that the first rod that failed took out the the adjoining rod and piston.

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