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Old 04-14-2017, 07:47 AM   #41
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How large are your replacement pistons?
I have yet to order them but a machine shop told me they'll need to inspect it before anything but from what i described on the phone itll need .5 oversize.
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Old 04-14-2017, 07:56 AM   #42
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pics of the top of piston number 3. Am i right in thinking if it was detonation they would be marks all over the piston instead of the edges?

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Old 04-14-2017, 08:16 AM   #43
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I was saying that FOD = foreign object damage after someone asked what FOD means...


#3 looks like detonation, and exactly where you'd expect it.




but it also does look like it could still just be FOD... especially with all the scratches over the spark plug.


can you post the MSQ file of your tune? did you have rods? you we really pushing the limits of a stock block.
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Old 04-14-2017, 08:17 AM   #44
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follow the conversation. I was saying that FOD = foreign object damage after someone asked what FOD means...
oh okay i mistaken it for ' Full on detonation'. Thats a relief!...... kinda
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Old 04-14-2017, 08:27 AM   #45
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I have a MS2pnp Extra and this is my tune.
Its got forged h beam rods.
Attached Files
File Type: msq CurrentTune.msq (118.7 KB, 10 views)
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Old 04-14-2017, 08:31 AM   #46
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also, with det, you start to see the edge wear down. you just have chucks missing:







see all the small pitting, and even melting the edge off. So mistaking det.


you will not mistake my FOD for det:

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Old 04-14-2017, 11:34 AM   #47
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also, with det, you start to see the edge wear down. you just have chucks missing:







see all the small pitting, and even melting the edge off. So mistaking det.


you will not mistake my FOD for det:

mine hasn't got any chucks missing and the edges don't look melted away, does this mean in my situation it's not det?
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Old 04-14-2017, 11:39 AM   #48
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No one can tell you for sure. Either way, now you'll be a lot more aware and careful.
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Old 04-14-2017, 01:12 PM   #49
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Great info on this thread! I hope to never melt my pistons lol
Good luck with the build!
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Old 04-14-2017, 05:51 PM   #50
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its foreign object debris.
Technically.
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Old 04-14-2017, 06:08 PM   #51
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Technically.
you've lost me now. One second people are positive it's FOD then say it's det, I really appreciate everyone's help I really do but I'm easily confused
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Old 04-14-2017, 06:12 PM   #52
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read post #48
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Old 04-21-2017, 12:31 PM   #53
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So ive taken the engine to an engine builder, theyve told me that its foreign damage, im glad about that! so looks like the bottom end is going to get a full rebuild inc new pistons and rings. gonna be pricey but at least its peice of mind that its been done.
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Old 04-21-2017, 02:09 PM   #54
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your timing map is hella conservative...




your fuel map is crazy...but rich where it counts





you're also using an injection timing table, yet setting it to 90. should be like -350

did you ever sync timing initially? i have a feeling your spark [and fuel] timing was incredibly off, which lead to det.
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Old 06-07-2017, 05:16 PM   #55
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Hello everyone again sorry for the late reply, new job means barely any time for myself so I've bought a daily and been building up the mx5 bit by bit.
okay so today I've finished installing the engine.
new rings bearings crank reground down and low mileage block.
cometic headgasket, same cylinder head but skimmed and genuine valve stem seals and valve guides fitted.
started up had a slight misfire but after a few minutes I think the lifters set themselves up as it went away.
only problem is, it's still smoking very badly. It's getting alittle upsetting now. I'm completely lost. Anyone willing to give me any advice?
just a random thought could there be the possibility that the cylinder head might have a crack somewhere letting in oil?
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