John Milner 810

iTrader: (4)

http://www.youtube.com/watch?v=JF2lMTFCpEU


i am seriously so lost.

first thought it had to do with clutch. replaced EVERYTHING all brand new from block to trans.

that wasnt it.

thought maybe bent pushrod/broken valvespring/ broken rocker.

pulled both valve covers, springs are fine, rockers are fine. pulled pushrods, rolled them all over glass. none are bent. everything is fine.

we CANNOT figure out what this noise is, and its driving me crazy.

did i blow it up? haha.

someone please diagnose for me. thank you.

lastcall190

iTrader: (36)

holy hell that sounds brutal... it also doesn't sound very consistent... I'm interested to see what others have to say because when the noise is there it aint pretty, but other than that it's fine. No cam in the car? Well, other than stock.

-J

andrew69_04

iTrader: (148)

well i thought it sounds like a collapsed lifter or a loose rocker arm, then in your vid the low oil light is on and you are only makin 20lbs oil pressure at adle and at 2 grand only 35. my LS1 usually puts out like 45 idle and 75 on the throttle. sounds like your gonna be pullin a motor to me

lastcall190

iTrader: (36)

Maybe I should've watched the whole damn vid, didn't know about the low oil PSI

My pressure is like andrew's, on a melling pump (2000 car). Good luck man, don't know if it'll be pretty. When did it start?

-J

John Milner 810

iTrader: (4)

i was afraid of that.

i changed the oil since then and if i remember right the oil pressure went up.

im not positive though.


so if i blew it up, what should i do for the rebuild.

my dad has built many motors, this will be my first.

lastcall190

iTrader: (36)

Did you see anything on the oil drain plug? Shavings, etc. was the oil slightly metalic...y?

Tons of options in terms of replacements. Budget, power goals, main use of car are all contingent factors (they are for me, at least).

-J

John Milner 810

iTrader: (4)

thats another thing. it never just STARTED making a noise. the clutch went in the fall of last year. it DID need a clutch, so i figured that noise was from the clutch. so like i said, it kinda started to do it when the clutch went. and EVERYTHING is brand new from spec. or gm replacement. as far as the clutch and hydraulics.



looks like im gonna have a big inch ls1 next spring. lol

John Milner 810

iTrader: (4)

no but when we pulled the valve covers my dad noticed something in the oil that could be metal shavings. i thought it was just some kind of dirt or something. the covers are still off, i can probably get a pic.

andrew69_04

iTrader: (148)

when u pulled the valve cover off did you re torque the rockers down? when i did my cam swap i went over all of them once and one came loose. trust me it dont sound good when it happens. they should be torqued to i believe 22 ft/lbs. definitly look at your oil too and check for shavings.

andrew69_04

iTrader: (148)

if you need a motor i got a 02 LS1 with 15K on it im gettin ready to sell!!! just drop it in

John Milner 810

iTrader: (4)

if i turn the car off, and turn it back on, it wont do it for like 30 seconds, then it starts to do it again.



you guys think it has something to do with a lifter?

next step is to pull the head i guess

John Milner 810

iTrader: (4)

oh! and it sounds like maybe the #6 cylinder we put the stethoscope on the header tube coming out of the head at #6 and it was a very loud *pang pang pang pang* noise

tilly

iTrader: (5)

yea that sounds like a knocking noise. MY car had a similiar sound and was a messed up lifter. Wont know the final verdict until I get the motor out (couple of more bolts)

John Milner 810

iTrader: (4)

anyone else have any input?

phoenix305

That most definitly sounds like a flat lifter! i would almost guarantee it! but only one way to find out. Post pics!

John Milner 810

iTrader: (4)

i hope i didnt blow this thing up.


who else has any experience with this?

mohammed_k81

I have just built my engine it sounds just like that everything is new lifters everything

I have a problem when we tightened the rocker it would stay up because the Pushrod are to long so I changed them from 7.400 to 7.200 now the problem is the car starts perfectly but all you can hear is the rockers chic chic chic.

Now what they told me was to replace the stock rocker with an aftermarket rocker or go for a cam that I can use Pushrod 7.400

Am really confused I don’t want to speed money with out solving the problem.


This is my engine spec

408 Strocker crank Lunati 4.000 Rods 6.125Lunati pistons 4.030 Mahle Dished Piston Set: 4.030".927" Wrist Pins, 1.105" CH, -12cc Dish
Cam comp SI7 238/244 605/612 – 110

Patriot Performance LS6 5.7L Stage II Head Assy
(2.02/1.60/59cc)