Thread: 20V catastrophic failure

My mate had an unfortunate weekend.

400wzf S14 SR20VET 20V with a built bottom end. He thought he heard noodle knock so he shut it down.

Cylinder #4 doesn't look good..


Next step, remove head


Cylinder liner


Valves


Seems like a mechanical failure, all the other cylinders look perfect. No knock was ever registered. Headgasket is still intact too!

holy crap so sorry to see that yikes

I hate days like that... Would be interesting to know what broke first to make that mess. Was it standard 20V cams and springs? How many RPM did it go up to?

Owch, not fun stuff. GL with the rebuild.

Happened to me it sucks

Sent from my SAMSUNG-SM-G928A using Tapatalk

looks like he floated the valves. Standard valve springs or did he upgrade them?

Though I should update this thread,

The reason was.............failed chain tensioner.

Next build is gonna be with a mechanical one...

Good idea.

What tensioner was he using? OEM 20V or S14?

I hope this was user era because im harming mine with a stock bottom end.