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Build 2.0 normal for pistons to do this?

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Old Nov 23, 2017, 01:57 PM
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Build 2.0 normal for pistons to do this?
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Old Nov 23, 2017, 06:25 PM
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With a larger piston to wall clearance, yes.
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Old Nov 23, 2017, 10:41 PM
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Depends on the piston, but, generally, yes... Pistons for FI motors are designed to be subjected to a lot of heat, so the piston has a lot of taper too it, smaller diameter at the top then the bottom.
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Old Nov 24, 2017, 01:01 PM
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Too much piston to bore clearance.
Have you measured it?

About 0.008 inch?
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Old Nov 24, 2017, 03:56 PM
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The shop has it right now they are looking at the rest of the motor and should have a full report. Car had 17 counts of knock on light throttle.
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Old Nov 24, 2017, 04:00 PM
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This is what it sounded like.
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Old Nov 24, 2017, 04:08 PM
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Old Nov 24, 2017, 05:31 PM
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That sound will be a different problem.

That sounds like the top end to me.....cams or rockers.
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Old Nov 24, 2017, 05:46 PM
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oh my gosh!!! turn it off!!!


hope you get it worked out.
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