help with scratches on cylinder wall

 
Old 12-11-2017, 03:37 PM
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hey HT I'm new on here and was wondering if someone would chime in on a problem I'm having , so I built an lsvtec with forged internals , I recently took the head off and noticed scratches running down vertical on the intake side on the bore , is this a butting issue or something else ?
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Old 12-12-2017, 09:35 AM
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Default Re: help with scratches on cylinder wall

Can you feel them with your fingernail? aka Does your fingernail catch on them?
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Old 12-13-2017, 05:15 AM
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Default Re: help with scratches on cylinder wall

Originally Posted by phattyfab253 View Post


hey HT I'm new on here and was wondering if someone would chime in on a problem I'm having , so I built an lsvtec with forged internals , I recently took the head off and noticed scratches running down vertical on the intake side on the bore , is this a butting issue or something else ?
it looks ok. U have more play with forged internals. I hope u run a good ptw clearence and pistonring clearence
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Old 12-14-2017, 04:05 PM
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Default Re: help with scratches on cylinder wall

Ya i'd say that looks fairly normal.
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Old 12-17-2017, 06:49 PM
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Default Re: help with scratches on cylinder wall

thanks guys , I can just barely catch them with my finger and the scratches are on both intake and exhaust side of the bore . so that leads me to believe it's maybe ptw clearance but I believe if I can remember it was 35-40 thou clearance . it's going in for a hone cuz I'm going hi comp for all motor and I'll verify with the machine shop if that's normal .
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Old 12-19-2017, 07:28 AM
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Default Re: help with scratches on cylinder wall

vertical scratches like that are almost always piston to wall problems.

"35-40 thou" is .035-.040" which is way too big. Moving the decimal over one gets you where you want: .0035-.004"
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Old 12-19-2017, 07:33 AM
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Default Re: help with scratches on cylinder wall

yes thanks so it's 3 and a half to 4 thoushanths
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Old 03-16-2018, 03:40 PM
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Default Re: help with scratches on cylinder wall

Originally Posted by phattyfab253 View Post
thoushanths
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Old 03-17-2018, 02:45 AM
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Default Re: help with scratches on cylinder wall

this ptw is good!
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Old 03-22-2018, 06:37 PM
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Default Re: help with scratches on cylinder wall

Make sure you clock your rings correctly as well
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