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The Terminator
Engine/Tuning
Is there any sort of Oil Pressure Relief Valve in our motors?
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<blockquote data-quote="Jiffy" data-source="post: 15665070" data-attributes="member: 124414"><p>The reason I ask is this:</p><p>About every 5th time I start the car, it sounds like I have a couple of failed lifters (or ones that have leaked down) and they tap away like a bugger for 30 seconds, then the oil pressure seems to close them up and the motor is quiet as a grave, sounds really good. It has about 55K miles.</p><p>Recently I pulled up at my nephew's house after a bit of a blast through the twisties, and he came out as I rocked up and we were having a chat as the car was idling - he mentioned that the motor sounded a bit knocky and was tapping away at idle - I checked and it was. It def sounded like there was a lifter or two down and the sound wouldn't go - it was equally loud underneath as it was with the hood open.</p><p>So - a bit pissed off, I drove home (5 minutes) and when I got there, the motor was perfectly quiet again - no mechanical noises! Baffled as ****!</p><p></p><p>So - in the past, I had an issue with the oil cooler leaking fluid - so I got the O-ring kit, stripped it, rebuilt it and that fixed it - could I have cocked something up then? This corresponds with the approx. time frame I started to notice the noise on cold start.</p><p>About a month ago (in terms of driving time) when the Eaton was off and before the Whipple went on, I had my mechanic replace the lifters hoping that would settle the issue. It has improved it a lot, but then the noise this weekend had me a bit worried......</p><p></p><p>It almost sounds like an oil pressure problem - like it's losing pressure intermittently - anyone had these issues before? Could it be a sticky oil pressure relief valve? A mis-aligned oil-cooler? A leaking cam chain tensioner? Some other frigging thing?</p><p></p><p>Thanks in advance</p></blockquote><p></p>
[QUOTE="Jiffy, post: 15665070, member: 124414"] The reason I ask is this: About every 5th time I start the car, it sounds like I have a couple of failed lifters (or ones that have leaked down) and they tap away like a bugger for 30 seconds, then the oil pressure seems to close them up and the motor is quiet as a grave, sounds really good. It has about 55K miles. Recently I pulled up at my nephew's house after a bit of a blast through the twisties, and he came out as I rocked up and we were having a chat as the car was idling - he mentioned that the motor sounded a bit knocky and was tapping away at idle - I checked and it was. It def sounded like there was a lifter or two down and the sound wouldn't go - it was equally loud underneath as it was with the hood open. So - a bit pissed off, I drove home (5 minutes) and when I got there, the motor was perfectly quiet again - no mechanical noises! Baffled as ****! So - in the past, I had an issue with the oil cooler leaking fluid - so I got the O-ring kit, stripped it, rebuilt it and that fixed it - could I have cocked something up then? This corresponds with the approx. time frame I started to notice the noise on cold start. About a month ago (in terms of driving time) when the Eaton was off and before the Whipple went on, I had my mechanic replace the lifters hoping that would settle the issue. It has improved it a lot, but then the noise this weekend had me a bit worried...... It almost sounds like an oil pressure problem - like it's losing pressure intermittently - anyone had these issues before? Could it be a sticky oil pressure relief valve? A mis-aligned oil-cooler? A leaking cam chain tensioner? Some other frigging thing? Thanks in advance [/QUOTE]
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Is there any sort of Oil Pressure Relief Valve in our motors?
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