Chain Replacements

[sapote]

A few months ago my brother in-law X3 with N20 bent valves due to chain jumped over sprocket. Root cause was a broken chain guide due to bad material, not the chain. Costed him $5000 with good Indy shop. The other crazy thing about this engine is the crank sprocket having no key -- just brute force of the bolt holding sprocket to the crank at any positions.

[sapote]

Listen to mine, especially when I put the phone down to the wheel well, it sounds very similar, maybe not as pronounced. I sure as shit hope this isn't a loose chain that will skip etc. I figured loose valves, who knows, I don't.

https://youtube.com/shorts/5DsZt9iDbYg?feature=share

I also don't hear any abnormal noise on yours, maybe a tat of valve clicking. What is you target clearance when you last set the valves? I always set the gap to minimum (7 and 11 thous) for the lowest valve noise. If car is not for track, I even think about one thousand less (6 and 10).

On my Porsche 912 (nothing compare to S54 engine), they are set at 0.004 and 0.006" even the metal thermal expansion on air cool is much more than water cool.

Previously I wrongly responded to the OP instead.

[bigjae46]

A few months ago my brother in-law X3 with N20 bent valves due to chain jumped over sprocket. Root cause was a broken chain guide due to bad material, not the chain. Costed him $5000 with good Indy shop. The other crazy thing about this engine is the crank sprocket having no key -- just brute force of the bolt holding sprocket to the crank at any positions.

There is a 7yr/70k miles warranty on the timing chain and guides. The guides are cheap plastic, wear out and cause the chain to stretch out.

[Cubieman]

I also don't hear any abnormal noise on yours, maybe a tat of valve clicking. What is you target clearance when you last set the valves? I always set the gap to minimum (7 and 11 thous) for the lowest valve noise. If car is not for track, I even think about one thousand less (6 and 10).

On my Porsche 912 (nothing compare to S54 engine), they are set at 0.004 and 0.006" even the metal thermal expansion on air cool is much more than water cool.

Previously I wrongly responded to the OP instead.

7thou intake side was my target, I had two valves that were at about 6thou so I loosend them up a bit, maybe that's the noise. I may put the shims I took out back in just to see if it makes a difference.