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The Terminator
Engine/Tuning
Detonation damage or another cause?
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<blockquote data-quote="ruthless" data-source="post: 14678822" data-attributes="member: 56567"><p>Oops spelled the subject line wrong. isn't that just great! LOL</p><p></p><p>I am looking for some input from people experienced in this area, the shop has there ideas but I wanted to see what you guys thought. Long story short, had my turbo cobra to a track rental in May and had a boost controller issue (spiked to 21psi or 93 pump gas, normal is 17ish psi) that I thought caused a lifted head since it blew the bottom rad hose off. All the spark plugs where fresh and looked good when I pulled them out but #7 was wet. No signs of detonation or abuse in the other cylinders and I am not sure if this would be detonation or not but I am waiting to hear if the surface of the head and block are still true except for the burnt area. I also didn't find any coolant in the oil and the pic will show why.</p><p></p><p> After tear down we found the following. (I was informed that its in a strange area for a lifted head.)</p><p></p><p>[ATTACH]34778[/ATTACH]</p><p></p><p>All of the other cylinders look mint with no heat in the pistons.</p><p></p><p>[ATTACH]34780[/ATTACH]</p><p></p><p>Also pulled the cap from the cylinder with the issue.</p><p></p><p>[ATTACH]34781[/ATTACH]</p><p> </p><p>The ideas I have heard so far are that one of the coil packs might have went bad or weak and the added boost caused the fuel not to burn properly in the one cylinder. (I would think that would be detonation??)</p><p></p><p>Post up your thoughts. I am just stumped because this doesn't look like damage I have seen in these engines before. I will post more if other damage is found.</p><p></p><p>Car ran perfect prior to this. I even have a AEM Fail safe wideband on the car that didn't trip to cut boost.</p></blockquote><p></p>
[QUOTE="ruthless, post: 14678822, member: 56567"] Oops spelled the subject line wrong. isn't that just great! LOL I am looking for some input from people experienced in this area, the shop has there ideas but I wanted to see what you guys thought. Long story short, had my turbo cobra to a track rental in May and had a boost controller issue (spiked to 21psi or 93 pump gas, normal is 17ish psi) that I thought caused a lifted head since it blew the bottom rad hose off. All the spark plugs where fresh and looked good when I pulled them out but #7 was wet. No signs of detonation or abuse in the other cylinders and I am not sure if this would be detonation or not but I am waiting to hear if the surface of the head and block are still true except for the burnt area. I also didn't find any coolant in the oil and the pic will show why. After tear down we found the following. (I was informed that its in a strange area for a lifted head.) [ATTACH]34778.vB[/ATTACH] All of the other cylinders look mint with no heat in the pistons. [ATTACH]34780.vB[/ATTACH] Also pulled the cap from the cylinder with the issue. [ATTACH]34781.vB[/ATTACH] The ideas I have heard so far are that one of the coil packs might have went bad or weak and the added boost caused the fuel not to burn properly in the one cylinder. (I would think that would be detonation??) Post up your thoughts. I am just stumped because this doesn't look like damage I have seen in these engines before. I will post more if other damage is found. Car ran perfect prior to this. I even have a AEM Fail safe wideband on the car that didn't trip to cut boost. [/QUOTE]
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Detonation damage or another cause?
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