Knocking Noise coming from i dont know where. Z6-T
 

buddie has a D16Z6 engine turbo'd.

z6 head
new bisi 2.4l turbo cam
new super tech valve
aem gear
blox springs / retainers
skunk mani
blox 68 tb
750cc
bdl rail

z6 block
z6 crank
acl bearing
fjt rod
vitara 75.5
moroso pan

y8 trans
act 6 puck unsprung
stock flywheel.

pilot bearing is great
throw out bearing is new

took it out one night did past 100mph (once) slowed down the this knock came on. it went quiet then it came back. took the car home.

pulled the head off and found 2 bent valves. replaced with super tech and seals. reinstalled. knock was gone. hit the gas and it came back. but i felt the knock through the clutch pedal. so we thought of the flywheel coming loose. this happened to me in my b20v where the fly bolts backed out and it cause a "knock" as well as my friends ls. also fly bolts backed out.

so he pulls the trans this morning and inspected everything. all in trq specs and all bearings good.

i told him that day it was a bearing from the rods. he wants others opinion before he tear it apart. any idea anyone?

i still think its rod knock lol.

Re: Knocking Noise coming from i dont know where. Z6-T
 

Can you get a video clip of the sound?

Re: Knocking Noise coming from i dont know where. Z6-T
 

well..the trans off now. he did all this before i woke up..i wanted to make a video yesterday but i didnt have my camera.

Re: Knocking Noise coming from i dont know where. Z6-T
 

my buddy broke the imput shaft bearing on his cable si tranny and had a nasty knocking sound that was somewhat intermittent.

Re: Knocking Noise coming from i dont know where. Z6-T
 

Drain the oil and pull the pan off. Check for bearing metal.

Re: Knocking Noise coming from i dont know where. Z6-T
 

he drained the oil and no spec of metal came out..but he took the pan off anyways and there was tons of shaving sitting there. bearings are more than likely done. thanks all.

Re: Knocking Noise coming from i dont know where. Z6-T
 

single cam oil pump has to be ported??

Re: Knocking Noise coming from i dont know where. Z6-T
 

pull one plug wire off at a time while the engine is running and rev it up like you normally would... See if the knock goes away. If it goes away when removing #1 cylinder, youve likey got a bent rod or spun bearing on that cylinder.

When you take away the spark, you take away all the force pushing the piston/rod.

Re: Knocking Noise coming from i dont know where. Z6-T
 

its been taken all apart yesterday afternoon.

upon tear down
-bearings in #3 is gone.
-crank is done
-oil pump is done
-1 fj rod is done.
-ton of metal specs in the pan.

Re: Knocking Noise coming from i dont know where. Z6-T
 

man i feel you on this

i spun a bearings about 3 weeks ago tore it down, and polished the crank, added new bearings to the rods, and walla made 757, went to the track and wamo spun every bearing and oil pump broken