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SVT Shelby GT500
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<blockquote data-quote="70SCJ" data-source="post: 11246094" data-attributes="member: 57556"><p>TVS 690 rwhp</p><p>18-19psi</p><p>11.7 A/F</p><p>Cool night, hard pull, 4500 rpm the #7 piston coughed up a piece of ring land.</p><p>I had suspected a problem for awhile due to a compression check and leak down test showing 10-12% low on 2 pistons. I knew I was on borrowed time.</p><p></p><p>Tear down showed the balancer (IW 10%) wasn't tight enough against the timing trigger wheel. The crank bolt had loosened over time. Wheel reamed it's keyway out then lodged itself tight, which probably affected the timing a great deal.</p><p>New build: MMR 1000, running E85</p></blockquote><p></p>
[QUOTE="70SCJ, post: 11246094, member: 57556"] TVS 690 rwhp 18-19psi 11.7 A/F Cool night, hard pull, 4500 rpm the #7 piston coughed up a piece of ring land. I had suspected a problem for awhile due to a compression check and leak down test showing 10-12% low on 2 pistons. I knew I was on borrowed time. Tear down showed the balancer (IW 10%) wasn't tight enough against the timing trigger wheel. The crank bolt had loosened over time. Wheel reamed it's keyway out then lodged itself tight, which probably affected the timing a great deal. New build: MMR 1000, running E85 [/QUOTE]
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