Perfect as in like new, meaning it was replaced after the damage?
Looks more like a dropped valve than a timing belt failure. The stock valve retainers have failed in a few engines that were run extremely hard
I'm not sure if the belt skipped causing the damage?
I'm only guessing but I would say the #1 cause of NSX engine failure is engine modification, including addition of superchargers and turbochargers, especially if tuning is not not done well. I would guess that number 2 would be oil starvation, during track events. Number 3 would be overheating due to improper coolant maintenance. Not to say any one of those issues caused the damage shown in the OP.
Dropped a screw from one of the VVIS butterflys ?
I'm not qualified
Dropped a screw from one of the VVIS butterflys ?
I'm not qualified
Which ECU is that? I'm pretty sure the OEM computer has a fuel cut at 8,200 rpm.That nsx ecu has no rev limiter.
With the way the damage is isolated to that one clinder, it makes you wonder if someone dropped something metal into the one cylinder during a spark plug change. It happens somewhat frequently in the 3000GT world. People unknowingly drop something (washer or bolt usually) into one of the cylinders, button the car back up, and start it. Ouch.
Are the plugs in the engine new?
def looks like the head of a valve has come off bounced around, smashed everything it can before exiting to the sump or out the exhaust... a dropped valve, or hi rev valve float meaning the valve and piston try to defy the laws of physics by trying to occupy the same place!
my Boss's Hart 420R has often suffered from this exact damage that was overrevving. if it's stock NSX it'll probably be too many revs!
with time and effort and a good welder, the head could be saved!
VVIS screws are all in place.Stock engine and ECU.1991Dropped a screw from one of the VVIS butterflys ?I'm not qualified
a little more history may help the nsxperts http://www.nsxprime.com/forum/showt...one-I-finally-got-one-93-Red-NSX-Thanks-Santa
lol that is called lazy research on my part:redface:.....so you are becoming a nsx hoarder :wink: nothing wrong with that.My only advice is to keep your eyes peeled for any and all recently wrecked nsx for a used motor.Also pm Shawn and Larry B if they have any leads.