12-03-2022, 10:09 AM | #45 | ||
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As far as power I was hitting 690 on the dyno with a bad coil and bad plug when we were first tuning so I am confident in the butt dyno alone it was in the 700s after. I could measurably feel the difference when I got new coils and plugs. Logs also showed that timing wasn't being pulled due to issues with spark. I just never took it back to pay for glory runs because it was running so well.
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12-03-2022, 10:13 AM | #46 | |
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12-03-2022, 10:30 AM | #47 | ||||
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12-03-2022, 12:13 PM | #48 |
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Assuming these were F80 injectors and not EU5…? So failed closed would assume detonation/pre ignition and failed open would mean hydraulocked, right?
Also thanks for posting up your thoughts on the vendors. In case this hasn't crossed your mind yet, I would definitely look into flushing or maybe even replacing oil coolers/hoses to avoid the possibility of re contaminating your new engine |
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12-03-2022, 12:36 PM | #49 | |
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12-03-2022, 02:14 PM | #50 | |
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12-03-2022, 03:56 PM | #51 | |
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The oil pan also broke, I had to repair it: |
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12-03-2022, 04:06 PM | #52 | ||
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12-03-2022, 04:17 PM | #53 |
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12-03-2022, 04:19 PM | #54 |
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Okay so it has nothing to do with the crankhub or cbc, should probably remove the title before people think it's that. But sorry to hear.
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12-03-2022, 04:21 PM | #55 |
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12-03-2022, 04:24 PM | #56 |
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I changed it because I still need to understand exactly what went wrong and will update the title then. I do still think it's important that people know my engine had both the Crank Hub and CBC installed and even with those safeguards in place, is not immune to this type of damage. The notion of a failed injector causing this destruction didn't come top of mind when it blew.
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12-03-2022, 05:26 PM | #57 |
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Poor quality fuel with stage2 tune, according client told me.
I think that if it were an injector problem, it would happen in all s55 engines, as for example happens in the vw 2.0tsi gen2, after tune in 99% of cases the injectors stay open, causing unstable engine work and white smoke with smell of fuel, I have not yet seen any case with engine breakage for this reason, i always change the 4 injectors, because over time the rest break. When do you plan to disassemble the engine? |
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12-03-2022, 05:42 PM | #58 |
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Thats somewhat right. When they break it can be open, closed or somewhere in between. The rich/lean would depend on how much fuel was leaking and how much fuel was needed at any given moment. Under load the situation usually leans out, and detonation happens… On the other hand you could be stuck a good bit open and run rich in that cylinder. And worst case is you have a bad leaker, leave the key ON for a long time before startup (filling the cylinder with fuel) and hydrolock when you go to Start.
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12-03-2022, 05:44 PM | #59 | ||
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12-03-2022, 07:31 PM | #60 | |
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12-03-2022, 08:08 PM | #61 |
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I'm curious of this too. In my mind it almost makes sense to go EU5 injectors if you're planning full E85. Seems it would help keep system pressures and IDC in check. I know it might seem like overkill since there are many people out there running full E without catastrophic failures. But the preventative cost seems worth it compared to the cost of being that one unlucky guy.
As for trying to figure out if that's what has happened after a failure, I suppose if the suspect injector is not damaged it could be bench tested. If the injector is stuck closed I would assume a lean condition causing the boom. If the injector checks out good then one theory could be low quality gas low AKI and detonation/pre ignition being probable. If the injector is damaged beyond bench testing then I suppose it's anyone's guess. But judging by the amount of damage caused as seen in both examples here (especially given the moderate-high power levels) it sure does suggest pre ignition under load is highly likely to my untrained eye. Understand data logs are not available. Is it possible to see what the tunes are set for on knock retard? Maybe some clues there. |
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12-03-2022, 10:52 PM | #62 | |
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12-03-2022, 11:30 PM | #63 | |||
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12-03-2022, 11:42 PM | #64 | ||||||||
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12-04-2022, 12:47 AM | #65 |
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First off Sorry to hear this happened to you.
injector failure would result in the car eating a plug and causing damage to the piston and cyl wall. Looks like the tune was indeed too spicy and you may have more likely bent a rod slightly. Still driveable for many miles and it finally gave out during a pull. Speculation but, the plug looks intact. Injector failing would cause thermal meltdown and loss of compression. Extreme case maybe broke the piston and got caught in the rotating assembly and window the block. Or rod knock and it finally let go during a pull. So many things. I hope you get your car sorted. You can send your injectors to RC engineering and have them checked out. That will eliminate that possibility or give you more data points.
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12-04-2022, 06:43 AM | #66 | |
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A slightly bent rod that finally gave out is a scary thought because I'd expect a bent rod to cause the piston to thrust in a way that would cause unwanted wear to a cylinder wall or even oil leak or a rougher idle and I had none of that. My car ran so smooth and strong until doomsday. We'll know very soon. I appreciate the feedback. |
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