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Old 05-17-2017, 09:08 PM   #9561  
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See above for pictures of pistons.
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Old 05-17-2017, 09:10 PM   #9562  
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Its definitely pitting.




Light shines through on the damaged area.
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Old 05-17-2017, 09:16 PM   #9563  
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Quote:
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See above for pictures of pistons.
Wasn't on this page. You expect me to sift through back pages?

Strange looking pitting. Looks more like Lichtenberg patterns than FOD.
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Old 05-17-2017, 09:17 PM   #9564  
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Looks like metal deposition, rather than damage. What do your pistons look like?
https://www.miataturbo.net/build-thr...7/#post1414941
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Old 05-17-2017, 09:18 PM   #9565  
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Ok, can somebody tell us what that is? I am in the process of building pretty much the same setup and don't want this. Nope, not at all.
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Old 05-17-2017, 09:27 PM   #9566  
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So its definitely some sort of pitting. Occurred on 6 lifters. 2 pretty bad. 3 a few spots of it. And 1 just 2 small places. I'll take better pictures in a bit. Pretty pissed right now.

Exhaust lifters all look 100% fine. Cam journals look great, cam lobes all look fine.
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Old 05-17-2017, 10:20 PM   #9567  
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I would put stock shims back in it. My guess is there is a material problem with those buckets, and you probably caught it early enough to save the cam. I would clean off any specs of metal stuck to the lobes and polish them, then go back with stock shims.
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Old 05-17-2017, 10:20 PM   #9568  
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That's really weird. Typically the cam hits near the center, and fwiw the cams tend to spin the bucket a little. No where near that pitting though.
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Old 05-17-2017, 10:24 PM   #9569  
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Right? I have no idea what caused it. Especially because the exhaust side looks perfect. But we all know how this market works. It was definitely my fault.....

I'm going to order 6 more tomorrow. Maybe overnight them. Not sure.

Replacing valve seals currently. Using my leakdown tester yo pressurize the cylinder. Leakdown number on cyl 1 looks good at least.

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Old 05-17-2017, 10:34 PM   #9570  
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Right? I have no idea what caused it. Especially because the exhaust side looks perfect. But we all know how this market works. It was definitely my fault.....

I'm going to order 6 more tomorrow. Maybe overnight them. Not sure.

Replacing valve seals currently. Using my leakdown tester yo pressurize the cylinder. Leakdown number on cyl 1 looks good at least.
My best guess is the lifters are too soft. For sure your fault!

I think it's a lifter problem, cause stock lifters/stock cams don't do that. Are you ordering the same brand lifters as before to replace these?
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Old 05-17-2017, 10:36 PM   #9571  
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These are lifters from Mazda Motorsports Development. Figured at least something under the Mazda name wouldn't fail me...but who knows.

$10 a piece. And I'll call tomorrow and see what they know about the failures.
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Old 05-17-2017, 10:36 PM   #9572  
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Does anyone know what color the OEM valve stem seals match up to. I have green and grey seals.
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Old 05-17-2017, 10:42 PM   #9573  
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Pretty easy to check hardness. I'd grab a stock shim and have the two tested. If you've ever used a spring loaded center punch it's like that but calibrated and then you measure the "crater" diameter.
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Old 05-17-2017, 10:44 PM   #9574  
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A razor blade doesn't scratch the surface. So they aren't made out of cheese. I'm still stumped on why the exhaust lifters look so perfect compared to intake.
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Old 05-17-2017, 11:08 PM   #9575  
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Thats so strange.
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Old 05-17-2017, 11:17 PM   #9576  
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Anyone who has installed valve stem seals lately. Is there 1 "click" or 2? When you push them down.
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Old 05-18-2017, 12:33 AM   #9577  
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Welp. Lost a valve keeper down the engine. This is going to be fun.
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Old 05-18-2017, 12:37 AM   #9578  
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Man you're having some bad luck!

From memory there is one firm click, and they are seated. I used a couple light taps with a hammer (I used an extension and deep set socket to push them onto the guide) to make sure they were completely seated.
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Old 05-18-2017, 12:42 AM   #9579  
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where did it vanish to? I has to be in the head somewhere right?
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Old 05-18-2017, 12:45 AM   #9580  
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Nope. Fell into the block
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