Valve clatter? - Page 2 - LotusTalk - The Lotus Cars Community

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post #21 of 26 (permalink) Old 02-16-2017, 11:46 AM Thread Starter
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Got the PM, Atwell. Already the LotusTalk community is paying dividends!


Originally Posted by carbuff View Post
Matt S is a good guy. Difficult to hear though, or diagnose on the internet.

If you want, you could compare with another Esprit in your area (I'm thinking @Pete Inno)

BTW, I sent you a PM.
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post #22 of 26 (permalink) Old 02-16-2017, 09:23 PM
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Congrats on your new Esprit Bob!

Does the noise vary at all on cold vs warm engine? While you and Pete are checking over your cars this weekend, be sure to check the exhaust manifold. Use a decent inspection mirror and check the undersides of all the runners. It is very common to have hairline cracks in one or more places and you can usually see evidence of small exhaust leaks there. Most of the smaller ones tend to get quiet once the manifold gets hot.

There is typically a small amount of valve noise but as was said, it's hard to diagnose if it's normal without hearing it. Maybe you could post a video if it's loud enough to record.


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post #23 of 26 (permalink) Old 02-17-2017, 07:13 AM
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I actually had more valve clatter with 20W-50 in the winter, switched to 15W-50 and it was definitely less loud.

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post #24 of 26 (permalink) Old 02-17-2017, 08:41 AM
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Originally Posted by Vulcan Grey View Post
I actually had more valve clatter with 20W-50 in the winter, switched to 15W-50 and it was definitely less loud.
Same here, a noticeable difference
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post #25 of 26 (permalink) Old 02-17-2017, 10:25 AM
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Clatter sounds like muzak
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post #26 of 26 (permalink) Old 02-17-2017, 11:13 AM
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This is for the V-8's. When I first got my Lotus the valve noise cold was bad. It would go away but it took a while till after it warmed up and the lifters pumped back up. I did some oil changes hoping it would clean the lifters and improve but it did not. Finally, just before an oil change I used an oil flush additive and ran the motor a short while on it. Did the oil change and now I hardly hear any lifter noise even when cold. This advice will NOT help anyone with a 4 cylinder motor, the lifters are NOT hydraulic, self-adjusting. Valve noise on them can only be stopped by manually adjusting them. Valve noise and exhaust leaks can be tricky, one can sound like the other or maybe you have both! The thing to do is check your valve clearances and if the noise is still there you may have exhaust leaks. It can't hurt to check the valve clearances first and should be done regularly anyway. If you do have to adjust clearances be sure to inspect the valve caps. There have been reported instances of fatigue on them here on this forum.
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