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The Terminator
Turbo Cobras
Ignition/spark related issues. Not plugs though (I believe)
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<blockquote data-quote="tt335ci03cobra" data-source="post: 15535414" data-attributes="member: 68944"><p>Exactly. The balancer bolt led to the failure. I don't know that the ring itself is damaged on mine, but the bolt simply isn't doing anything productive.</p><p></p><p>When he threw 24° of timing at it, it came back to life which confirmed the suspicion. </p><p></p><p>Something about the ac pump constantly engaging it's clutch mechanism and the difference that makes to the rotating assemblies strain excasserbated the wear on the bolt.</p><p></p><p>Additionally, we had a tensioner assembly literally bend from heat related issues, leading the serpentine belt to slip off. I wonder if the 3-4 weeks that the tensioner assembly kept bending more and more had anything to do with exacerbating stress to the crank and balancer bolt. </p><p></p><p>It's interesting but very frustrating how little things lead to bigger problems...</p><p></p><p>One thing I am a little worried about is compression. The mill showed 130psi of compression in each cylinder, very uniformly, but that just seems low. My previous 4.6 and 5.4 builds have had 160-180psi. Those had stock c heads/cams/valvetrain though. </p><p></p><p>I have heavily ported stage 3 for heads flowing 370cfm, and 9.3/1 compression right now from a 3.8s/3.7b so that is going to lead to lower numbers but if I had had to guess, I'd have assumed healthy was into the 145-150 range.</p><p></p><p>Is 130psi healthy for compression on this mill?</p></blockquote><p></p>
[QUOTE="tt335ci03cobra, post: 15535414, member: 68944"] Exactly. The balancer bolt led to the failure. I don't know that the ring itself is damaged on mine, but the bolt simply isn't doing anything productive. When he threw 24° of timing at it, it came back to life which confirmed the suspicion. Something about the ac pump constantly engaging it's clutch mechanism and the difference that makes to the rotating assemblies strain excasserbated the wear on the bolt. Additionally, we had a tensioner assembly literally bend from heat related issues, leading the serpentine belt to slip off. I wonder if the 3-4 weeks that the tensioner assembly kept bending more and more had anything to do with exacerbating stress to the crank and balancer bolt. It's interesting but very frustrating how little things lead to bigger problems... One thing I am a little worried about is compression. The mill showed 130psi of compression in each cylinder, very uniformly, but that just seems low. My previous 4.6 and 5.4 builds have had 160-180psi. Those had stock c heads/cams/valvetrain though. I have heavily ported stage 3 for heads flowing 370cfm, and 9.3/1 compression right now from a 3.8s/3.7b so that is going to lead to lower numbers but if I had had to guess, I'd have assumed healthy was into the 145-150 range. Is 130psi healthy for compression on this mill? [/QUOTE]
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Ignition/spark related issues. Not plugs though (I believe)
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