Scratched pistons

 
Old 06-08-2018, 07:38 AM
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Default Scratched pistons




Hi, I have a big problem. My engine runs very well, buy oil consumtion was very high, so i disassembled my Honda H22 engine after 2000km run.

Engine has dry darton sleeves and CP pistons.

3 pistons are scratched :-(

How can it happen? Very rich fuel mixture? Overheated?

Is is repairable?

Thank you very much!
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Old 06-08-2018, 12:50 PM
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Default Re: Scratched pistons

What was your piston-to-wall clearance? What side of the piston are these scratches on? Intake or exhaust? Both? Was the engine assembled by a shop? Was this a turbo engine? At first glance it looks like your piston-to-wall clearance was just a hair on the tight side and the engine got a good amount of heat in it at one point like during a long 5th gear pull, etc.

As far as being repairable it depends. If money is an issue and the scratches aren't too deep, you COULD sand & polish the skirts. I'm not saying you should but you could. The pistons will run small in certain spots and if there's any issues with the cylinders you'll be right back to where you are now. Best to fix it the right way and start over with a new set in some freshly machined cylinders.
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Old 06-08-2018, 11:42 PM
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Default Re: Scratched pistons

P2W clearance was from CP piston specification. Scratches are only on pistons 1,2 and 4 and only on exhaust side. Engine was assembled by shop. Can it happen by very rich mixture?
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Old 06-09-2018, 01:11 AM
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Default Re: Scratched pistons

what is very rich mixture? do u have a wideband? looks like a bad p2w clearence for me.
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Old 06-09-2018, 02:11 AM
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Default Re: Scratched pistons

Yes i have. 12-13 whole map.
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Old 06-09-2018, 10:24 AM
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Default Re: Scratched pistons

12-13 is not Rich enough to make this scratches...8-10afr on long Time maybe...this scratches are Mechanical problem.
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Old 06-13-2018, 02:45 AM
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Default Re: Scratched pistons

Originally Posted by 1HGEJ2 View Post
what is very rich mixture? do u have a wideband? looks like a bad p2w clearence for me.
More like half-*** install job by idiots at the shop. OP, I would refrain from going back there.
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Old 06-13-2018, 12:44 PM
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Default Re: Scratched pistons

Not sure if you played with the rings at all when you took your pistons out but, in your top picture all of the end of the oil rings are all on top of each other. This is also a sign someone doesn't know what they're doing.
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Old 06-22-2018, 02:04 AM
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Default Re: Scratched pistons

Thank you guys!

P2W clearance was tight. Clearance was 0,046mm. Specification sheet says 0,0762 mm.

Is it that problem?

Thank you.



Josef
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Old 06-22-2018, 08:06 AM
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Default Re: Scratched pistons

Yes
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Old 07-05-2018, 05:22 AM
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Default Re: Scratched pistons

Originally Posted by Cho0se View Post
P2W clearance was from CP piston specification. Scratches are only on pistons 1,2 and 4 and only on exhaust side. Engine was assembled by shop. Can it happen by very rich mixture?

there specs are to tight for my liking and most engine builders in the honda world! dont go tighter than .0035-.0040 on a turbo motor I dont care what the spec sheet says for under 500 hp
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Old 07-05-2018, 10:08 AM
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Default Re: Scratched pistons

0.0040 is the best way for cp, je, wiseco and arias
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Old 07-05-2018, 10:09 AM
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Default Re: Scratched pistons

Originally Posted by Cho0se View Post
Thank you guys!

P2W clearance was tight. Clearance was 0,046mm. Specification sheet says 0,0762 mm.

Is it that problem?

Thank you.



Josef
thats to tight!!!! 0.04mm is for oem cast pistons.
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