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SN95 Cobras
Rod knock: Why?
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<blockquote data-quote="Serfma" data-source="post: 16814363" data-attributes="member: 196123"><p>It's been a crazy journey but here I am. I swapped a 98 Lincoln Mark 8 motor (130k miles) that I got from my brother in law into my 96 Cobra. 10 minutes into it's drive to the exhaust shop, and being on the side of the road to fix the cooling fan since the ECU coolant temp read 220, it gained a new feature called rod knock. I'm posting here to ask: Why? </p><p></p><p>It had a Kenne Bell 2.1 installed, 60# injectors, long tubes, EGR all deleted, and a base tune from my tuner whilst keeping it well under half throttle to attempt to keep it outside of boost during the drive. I do recall hearing backfiring a bit, which the intake cam on the passenger side was off by 1 tooth which I had fixed and verified timing was correct. Backfires sounded like it was coming from the same passenger side but was not as loud as when it was out of time. </p><p></p><p>Here is a video of the knocking along with oil pressure: [MEDIA=youtube]714RI-A6dSg[/MEDIA]</p><p></p><p>Is it possible the bearing was on it's way out? Contaminate got into the oil? Oil was new pennzoil 5w-30 (or -20, can't remember for certain) and sadly I was not keeping an eye on the oil pressure since I assumed I would have no issue seeing as at cold the aftermarket gauge read 100psi and I watched it just about until it got around 40psi then I kept my eye planted on ECU coolant temp.</p></blockquote><p></p>
[QUOTE="Serfma, post: 16814363, member: 196123"] It's been a crazy journey but here I am. I swapped a 98 Lincoln Mark 8 motor (130k miles) that I got from my brother in law into my 96 Cobra. 10 minutes into it's drive to the exhaust shop, and being on the side of the road to fix the cooling fan since the ECU coolant temp read 220, it gained a new feature called rod knock. I'm posting here to ask: Why? It had a Kenne Bell 2.1 installed, 60# injectors, long tubes, EGR all deleted, and a base tune from my tuner whilst keeping it well under half throttle to attempt to keep it outside of boost during the drive. I do recall hearing backfiring a bit, which the intake cam on the passenger side was off by 1 tooth which I had fixed and verified timing was correct. Backfires sounded like it was coming from the same passenger side but was not as loud as when it was out of time. Here is a video of the knocking along with oil pressure: [MEDIA=youtube]714RI-A6dSg[/MEDIA] Is it possible the bearing was on it's way out? Contaminate got into the oil? Oil was new pennzoil 5w-30 (or -20, can't remember for certain) and sadly I was not keeping an eye on the oil pressure since I assumed I would have no issue seeing as at cold the aftermarket gauge read 100psi and I watched it just about until it got around 40psi then I kept my eye planted on ECU coolant temp. [/QUOTE]
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Rod knock: Why?
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