Possible Rod Knock

EvoVIII808 · Aug 12, 2009, 12:35 AM

ive been doing alot of searching on here and some other sites, and think i have a spun bearing on #1 cyl.
Whenever i start the car the knocking is really loud (Cold Start).
Once the motor has warmed up, the knocking can barely be hurd. sounds more like a lifter ticking.
Also once warm i can rev the motor, and the knocking/ticking is hurd, but is not at all loud. I also have an exhaust leak at the manifold to head, and manifold to DP.
i will try to get a video up. but for now any inputs?

Doesnt seem like a major loss in power, although full boost seems to kick in abit later then it use to ( 3.8-4k now 4.5 to almost 5k.)
will break down the motor this weekend and post pictures

Dave@TTP · Aug 12, 2009, 08:52 AM

Seems more like a noisy lifter. A Spun rod bearing would get progressively louder to mention the more youre boosting the more youre shredding the crank up.

Check your oil filter for metal shavings.

Sievers · Aug 12, 2009, 09:19 AM

On my recent spun bearing it started out sounding like lifter tick so thats what I took it as. I was going home from work to swap lifters and thats it.....I was stranded on the side of the road with it knocking LOUD

thedru13 · Aug 12, 2009, 09:36 AM

Had something similar on my DSM the plastic lower belt cover was hitting. Check to see that nothing is touching the belts.

Mellon Tuning · Aug 12, 2009, 09:37 AM

hopefully just a bum lifter

Sassaphrass · Aug 12, 2009, 11:26 AM

im in the process of rebuilding my engine from a spun rod in the #2 cylinder. if its a spun rod the knocking will continue to grow in noise and i also didntnotice a huge power loss, so i wish the best to you

Sievers · Aug 12, 2009, 07:52 PM

By the way, I have a couple stroker cranks if you are looking to go that way with your build. heh.

I hope that it is just a lifter ticking though.

EvoVIII808 · Aug 12, 2009, 10:24 PM

didn't take apart the motor yesterday, but took out the #1 Spark Plug. Plug looked normal (brownish with alittle white). I changed it with another plug that i had, crunk it this morning, and NO HARSH KNOCKING. i also tightened the exhaust manifold (the stud is striped inside the head, just kept turning). But once i would accelerate driving down the road i can hear a ticking consistent with the rpm, never getting louder just more noticeable.
i will start puting my other head together just incase with 1mm oversized lifters.
will keep posted.

Mellon Tuning · Aug 13, 2009, 06:44 AM

seems like lifter tick... can you get us a video. when I had rod knock in the TT Stealth it would get louder when I revved the engine up while stationary or if I put load on it with boost.

Sievers · Aug 13, 2009, 09:49 AM

Well, mine did what you are saying whenever I blew a head gasket. Do a compression test.

EvoVIII808 · Aug 16, 2009, 07:34 PM

will do. i will post a video up. Just found a Vac Leak under my intake manifold

still a consistent ticking sound from #1 its either Valve or lifter.Also noticed when i am slowing down from an acceleration i smell radiator fluid. Happens while doing light pulls like 5-10psi and then off throttle slowing down. Maybe blown gasket.
No oil in radiator res. everything seems normal.
i started assembling my other head

Race Port/Polish and waiting on new 1mm valves, and 5 angle.

EvoVIII808 · Aug 16, 2009, 08:08 PM

Here are some videos. 1 is the Idle Warm up, and the other is a few revs.
http://www.youtube.com/watch?v=ms8wJ6WcxMo (Rev)
http://www.youtube.com/watch?v=pbbJWPUq-rc (warmup)

katchup · Aug 18, 2009, 02:07 AM

Any update?

Domolution · Aug 18, 2009, 02:33 AM

Quote:

Originally Posted by katchup

any update?

+1

mini_evo · Aug 18, 2009, 03:57 AM

It sounds like you have 1 of 3 things. Valve slap, lifter tick, or your rockers are out of adjustment. Now that I think about it, it's all related since we have hydraulic lifters in the 4G63.

Try bleeding your lifter's again and see if that makes a difference.