B16 ringland failure?
#1
B16 ringland failure?
I've been running 8 psi for a while now, completely stock engine except for the turbo setup of course. After a pull It didn't want to idle right and when cranking the engine it sounded like low compression. So I pulled the head expecting to find a melted piston. I'm guessing it's a broken ring/ringland? A/F ratio never has been lean. Pics attached:
#3 cylinder
#3 cylinder intake runner also has a substantial amount of oil in it while the rest are dry?!?
#3 cylinder
#3 cylinder intake runner also has a substantial amount of oil in it while the rest are dry?!?
#3
Re: B16 ringland failure?
Thanks for the input. Does that cylinder scoring look like ring failure?
#6
Re: B16 ringland failure?
So you're saying it had too much timing in it at WOT causing high cylinder temp? Sorry I know very little about tuning. I built the tune from scratch using crome and an ostrich emulator...
#7
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Re: B16 ringland failure?
The scuffing in that position on the cylinder wall is a common sign of a ring land failure. It doesn't look like it broke persay so much as the ring land area basically melted and deformed.
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#8
Re: B16 ringland failure?
I will be pulling that piston out tomorrow, so I'll put more pics up then. What would have prevented this? Less timing? Or is 8 psi too much for stock b16 to handle daily
#9
Honda-Tech Member
Re: B16 ringland failure?
did it get tuned. was the engine healthy before tuned. sometimes the they just let go
Last edited by ls joker; 11-15-2015 at 05:03 AM.
#10
Re: B16 ringland failure?
Engine was freshly overhauled just before it got a turbo. I pieced the turbo setup together and tuned it myself as best as I knew how. Afr's were good. 11.8-12.2 at wot. It's got about 3000 miles on the turbo and daily driven. I've done a lot of full throttle pulls, so I wouldn't say I've been easy on it. It ran good for what it was.. stayed beside a lightly modded STI from 40 mph roll
#11
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Re: B16 ringland failure?
Psi is irrelevant when it comes to this. If you want tuning advice, head over to the Engine management forum with any tables, maps, logs that you have, and you may get better consensus. But that's where new tuners like yourself will get more concise answers, not here.
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Re: B16 ringland failure?
I couldn't help but post this lol
If you killed a ringland at only 8psi on 91 then clearly it wasn't tuned.
Post the details of your entire setup...
If you killed a ringland at only 8psi on 91 then clearly it wasn't tuned.
Post the details of your entire setup...
#15
I never narc'd on nobody!
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Re: B16 ringland failure?
OP has admitted that he's an amateur at tuning, so he should just take this as a learning experience and do better next time.
Wantboost, you want a sad piston? This is a sad piston.
Attachment 517301
That came out of my engine from the previous owner before I built it.
Wantboost, you want a sad piston? This is a sad piston.
Attachment 517301
That came out of my engine from the previous owner before I built it.
#16
#17
Re: B16 ringland failure?
Lol I'm saving that picture! The car has 800cc injectors, ostrich, tuned using crome, stock fuel pump, wideband, t3/t4 turbo external wastegate, fmic... that's about it...
#18
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Re: B16 ringland failure?
Pffft go big or go home lol
I win lol. The rod was actually wedged inside the cylinder and around the crank. Took me the better part of 3 hours to remove it. I have no idea where the rest of the piston went either. The funny thing is the block this happened to is still viable with a patch over an oil galley, didn't even punch through the block.
OP can you post screenshots of your ignition and fuel maps? That will tell the tale the best. While your AFR might have been solid it looks like ignition timing is to blame here.
I win lol. The rod was actually wedged inside the cylinder and around the crank. Took me the better part of 3 hours to remove it. I have no idea where the rest of the piston went either. The funny thing is the block this happened to is still viable with a patch over an oil galley, didn't even punch through the block.
OP can you post screenshots of your ignition and fuel maps? That will tell the tale the best. While your AFR might have been solid it looks like ignition timing is to blame here.
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