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| Re: 3J Improved Production coupe- Racing Videos & Progress |
Subject: Re: 3J Improved Production coupe- Racing Videos & Progress
by mcgee on 2015/4/4 10:27:34
found the problem after some more teardown.
No. 3 piston below....
Unsure what went first, but suspect the noise is piston slap.
Gudgeon pin split and cracked in two. Rod gudgeon pin bush rotated, blocking oil hole. Piston cracked in gudgeon pin bore. Evidence of ring landing scraping side of bore.
Big end bearing looked a little worse for wear but not showing signs of oil starvation which is good.
Anyway Time for a rebuild. Will bump up the static compression ratio on this one too.
Looking to go up to 10.5 to 11:1... Have some ideas on how to achieve this and keeping the flat-top pistons.
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