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Loud engine clacking/tapping noise - Cyl #4

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Old 09-11-2010, 05:24 PM
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Time to pull the motor I guess.. Any good DIY threads?
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Old 09-11-2010, 08:06 PM
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Not much help here but how did you manage to damage/score the walls of cylc 4? How much mileage on the engine? Did you upgrade with the later 4 hole banjo bolt?
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Old 09-12-2010, 01:20 AM
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No idea how it got scored. 102k miles, all original engine components, never disassembled to my knowledge.
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Old 09-12-2010, 06:28 AM
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Originally Posted by lke2drvgsr,Sep 12 2010, 01:20 AM
No idea how it got scored. 102k miles, all original engine components, never disassembled to my knowledge.
Interesting, thanks for the reply. Was oil changed on a regular basis? Track usage? Does it see VTEC often? I have read a lot of cycl 4 failures with early AP1. Just wondering if it can be prevented as i have a super early AP1 as well.

Thanks.
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Old 09-12-2010, 07:50 AM
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^ Also no clue to any of those questions... just bought it recently as a repo so I'm not sure what kind of history it's been through.
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Old 09-12-2010, 08:20 AM
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Originally Posted by Petah78,Sep 12 2010, 08:28 AM
Interesting, thanks for the reply. Was oil changed on a regular basis? Track usage? Does it see VTEC often? I have read a lot of cycl 4 failures with early AP1. Just wondering if it can be prevented as i have a super early AP1 as well.

Thanks.
mine got scored after going on a group drive, i was low on on oil and had the earlier banjo bolts

i think if i had the proper amount of oil or the updated banjo bolts, it would've been fine

now i check my oil every day and have the updated banjo bolts
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Old 09-12-2010, 11:13 AM
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Are the early AP1 banjo bolts defective or something?
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Old 09-12-2010, 12:01 PM
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Definitely sounds like piston slap...happened to my s and the video clip of my car sounds identical
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Old 09-12-2010, 02:29 PM
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Would that be caused by the scored cylinder allowing combustion into the wedge between the piston and cylinder?
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Old 09-13-2010, 04:39 AM
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Originally Posted by lke2drvgsr,Sep 11 2010, 05:38 PM
Status update: I think Bill may be right about that scored wall... Can't really get any clear pictures of it, but it looks like there are streaks on both sides of #4 cylinder each about 2" wide.
Streaks are as wide as the piston skirt, and appear black yes?

Noises can be hard over the internet sometimes, but high compression in #4 was a dead giveaway.

did you do any high spped runs? was the car ever supercharged or turbo?
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