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
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
