after a recent rebuild on my 7bolt engine I had an awful experience throwing putting a whole through my block the size of a softball. Before This insane engine failure, engine had about 700-1000 miles on rebuild. a few bolt ons and was street tuning with ecmlink v3 when i maxed stock injectors out I had purchased some 1000cc fic's from a friend who had just bought a new gsx that came with them. After installing new injectors did some changes in link and went to do some pulls. car ran normally. a buddy of mine was driving while i was holding the laptop.

we turned down a street to actually get on it. second gear barely getting on the engine. maybe 3-4K rpm's and BANG Goodbye new rebuild. all bearings were good. I Hope this doesn't happen to anyone else..
Has anyone experienced a failure similar to this???? Im not positive what had caused this.. just bad injectors and caused motor to hydrolock?

Jesus sorry to hear of the failure! Did you assemble this yourself after having the machine work done? Be nice if you could post a better picture of the cylinder walls but they look OK from what I see on my cell phone in the one pic you posted. You may have had an injector stick open and hydrolocked that one hole, it takes some significant pressure to bend a rod that badly. If the bore was undersized or the rings weren't filed right leading to the ringlands breaking I'd suspect a ton of scrapes and gouges. Looks like it simply tried to compress too much fluid. May also have not had a HG seal correctly letting water in?

oh cylinder wall is broken away at the bottom of it. i think only because wrist pin broke and piston was inside of engine smacking around and probably got stuck in between bottom of cylinder wall and what ever was left of the rod I'm thinking..? ha but machine shop assembled full long block. ran great before this.. the idea is that exactly, that the injector stuck open and hydro locked it.

RAW FOOTAGE.

That sucks. Its a terrible feeling when it happens. It happened on my stock 100k mile 7 bolt years ago while i was loading the engine in 5th at around 70mph. What I believe caused the failiure was a loose injector plug, my block looked exactly like yours in only one of the cylinders. I was tuned on e85 at the time with good numbers. Luckily no one was behind me cause I was spewing peices of engine block all over the freeway. Live and learn

us took we went back about 200 feet picking up pieces all over the road... thats kinda scary because i replaced an injector clip a while ago...! hmmmm...

and it just happens to be on the same cylinder.. hmmmm.... but an unplugged clip wouldn't it not spray at all????

Yikes, Sorry that this happened. Do you have a log you can post up from when the engine gave out?

Exactly causing you to lean that cylinder out and boom.

+1 on the live and learn. my 4g63t failed epicly but silently while coasting to a stop light. bone stock and all maintenance was up to date. it took me 8 years to build up the nerve to do a build on it. ok to fail as long as you can learn from it, and there are many wise people on this forum.... i would try to test the injector for that cylinder to see if it will stick again during a bench test. either way i would have them tested and cleaned before considering using them again. good luck ,and keep the dsm faith

I am definitely not using those injectors again.. Ha but will be sending them off to get tested for sure when I get the money. I don't have the log unfortunately. Don't think it would show much anyways...

Haven't even seen boost yet tho, I couldn't imgaine it leaning out and blowing up like that.. But I don't know. Ha

Oh and also this is my 4th engine. In about a year and a half same car... Ha EVERYTIME a terrible lesson. I'm done learning this way. Lo just spent 2300$ on a built 2.4l engine hope this one goes well!

Improperly torqued or untorqued rod nut? Are the hardware accounted for? It looks like the stud is missing in pic 5810.

failure at the piston ring lands, i presume...

this may have been a cause? http://evo123.net/forum/technical/evo-technical/3796-heavy-breathing-from-valve-cover

henrysan said:

Do you have a log you can post up from when the engine gave out?

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+1 I'd be interested in reviewing the log.

Was this on pump gas, meth, or e85? I assume the former...

I doubt hydro lock.... with a 47cc head, plus dish and gasket about 60cc of fluid just to flush fill after that the rod would bend, not snap.

Add to the fact that the engine was running, it would take an immense amount of fluid in the cylinder to do that.
Think about it at 1000 rpm, that one cylinder is hitting 250 times in a min or a bit more than 4 times a sec.

So even a 1000cc/min fuel injector running wide open would not flow enough fuel to cause hydro lock.

add into the fact that that a valve is open on both intake and exhaust stoke that fluid could be pumped out of. Hydro lock just is not plausible.


Rod stretch from over rev or just metal fatigue would be my best guess

Basically you snatched the rod in 2, the weight of the piston wanted to continue up when the crank wanted to pull it down.

I have done the same thing on an engine before, about 2500 miles on my build, I was pulling up on the on ramp to the interstate... heard a pop and something that sounded like glass shattering, coasted to a stop and looked under and just a big puddle of coolant and oil.

crimsondragon said:

Improperly torqued or untorqued rod nut? Are the hardware accounted for? It looks like the stud is missing in pic 5810.

Click to expand...

So I Am assuming of course... The wrist pin snapped off piston dropped down and wedged between rod. and that blew the one rod bolt off. after taking rod off all together the bearings looked okay.. I now after speaking with a reputable local 4g63shop is also saying he doubts it was hydro lock as well...

c2ypt1c said:

+1 I'd be interested in reviewing the log.

Was this on pump gas, meth, or e85? I assume the former...

Click to expand...

this was just on pump 91. haven't even tuned just stock tune. no log unfortunately

The rod snapped, first, then the piston slid down and got beat to hell. the rotation of the crank and half a rod spinning in an uncontrolled motion busted the block and busted the rod bolt on the decel of the engine.

what caused rod to snap I wonder then?

An impurity in the metal combined with all the stress and fatigue I would guess.

Man that really sucks! Makes Me worry about getting on My car

Jeez, man. Sorry for your loss. Sucks you didn't even get a chance to play with it...

The engine that came with my 1g talon was blown pretty bad when I got the car, it had a bunch of piston parts and bent rod fragments in the oil pan, and the oil pan itself had a few slits in the side of it.

And for some reason [who knows] the block never got a hole in it, but the balance shaft was pretty bent up, and the lower half of the combustion chambers that don't see the piston was scratched a bit even so I think the block might be savable..., but I did not want to risk it, so I got another motor all together, and I'm now in the process of building up a motor at a shop at the moment, it's being machined and prepped.

OP Real sorry to hear about your motor failure man, I'd say sometimes the big mistakes help us more then the little ones, so if anything at least you've seen what can happen first hand next level dsmer award right there.

btw were you running 6 bolt, or 7 bolt rods when this happened to your motor?