saturday night motor started a chatter, like valve/rocker flutter

monday morning halfway to work i lose about 25%+ power and hear a loud bang/knock, i pulled over and listened while running. had towed home. pulled head and all is perfect, cyl walls are perfect.

so what else could it be, prolly bottom end related???

i need some most likely options so i dont waste anymore time, thanks

btw, 117,000 miles, 4 or 5 redlines, very well serviced engine.

 

Anyone?

 

I would do a compression check and pull the valve cover inspect valves

 

cut open your oil filter and check for metal

 

Bent valve is a possibility.

 

Already pulled the head, everything up top is spec

 

Check the timing, maybe the timing chain skipped a tooth or something. Also are you running an aftermarket clutch like an ACT? Could be crank walk (that's a wild guess).

 

Pull your oil pan, and inspect your rods, If you wiggle the big end where it connects to the crank, and it clanks, you spun a rod bearing.

 

Yes, have an act clutch and flywheel

I think its rod bearing, I found copper flakes in the vtec solenoid

 

ok, im droppin head back on, my dumbass didnt check timing before i pulled everything, and i recently swapped the TCT spring for a longer one, im hoping it just lost tension very fast and the chain jumped teeth.

thats what i get for playing engineer on my motor.....shame