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cylinder wall issues

 
Old Apr 16, 2019, 01:31 PM
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cylinder wall issues


are these little marks cause for concern? the look like stress marks to me but not sure if i should source a new block or build this one.
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Old Apr 16, 2019, 02:11 PM
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How many miles are on this block? Those marks are very common with hard use or high mileage engines. If you can't feel them with your fingernail then they are superficial. If you can, you can still build this block if you go with a slight overbore, which most people do in order to clean up and straighten the cylinder bore.
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Old Apr 16, 2019, 02:36 PM
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engine has about 95k miles on it.
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Old Apr 16, 2019, 02:48 PM
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Originally Posted by snow306 View Post
engine has about 95k miles on it.
Yup, that's par for the course then. Looks like some decent side loading wear as well, which is to be expected. I would be perfectly ok using this block for a rebuild as long as you bore and hone 0.020" over. Use a torque plate if you really want it to come out perfect.
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Old Apr 16, 2019, 03:47 PM
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Those lines don't look deep. Could possibly get away with .010" bore. I always have my machine shop see what it takes to clean up the bore, then order pistons accordingly. It's worth the small extra expense and time taken given how 4g blocks are only getting more expensive and hard to find (especially evo blocks).
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Old Apr 16, 2019, 06:32 PM
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Thanks guys talked to my local machine shop and its gunna be about 400 bucks.
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Old Apr 17, 2019, 09:13 AM
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Originally Posted by snow306
Thanks guys talked to my local machine shop and its gunna be about 400 bucks.
Tell them you don't want it finish honed until you get pistons. You just want the bore cleaned up so they can tell you what size piston it will need.
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Old Apr 19, 2019, 06:52 PM
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Originally Posted by letsgetthisdone View Post
Tell them you don't want it finish honed until you get pistons. You just want the bore cleaned up so they can tell you what size piston it will need.
what would the reason for that be wouldnt I need the finish hone either way?
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Old Apr 19, 2019, 07:19 PM
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You need to find your pistons, then measure each individually and decide which best fits into which cylinder. Then you know how much more you need to bore in each cylinder before finishing.
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Old Apr 22, 2019, 03:31 PM
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Originally Posted by snow306 View Post
what would the reason for that be wouldnt I need the finish hone either way?
Because they bore it unitl it's clean and ready to hone, then measure to see what size it is, order appropriate pistons, and finish hone for the pistons.
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