MechMan

I guess. Ive been chasing down a knock.
which we thought were the lifters. So I replaced them
with the cranes. Then the knock is still there.
So today I pull the #6 and #8 rockers and pushrods.
and the knocks gone. So I put #6 back together, and It all sounds good no knocking. Then I put #8 intake in, start it up, and its knocking, So I remove the intake, and put in the exhaust, and it has a slight knock, not to bad. Now this is the same cylinder that I heard the knock from in the first place, that made me replace the lifters. Any Ideas guy's? Im lost.
all we can think of is to pull the heads agian, and look around, and see if somthing is blocking the oil. Any sugestions ?

By the way its not valves, pushrods,springs, or rockers. they were all replaced, at the same time as the lifters.

<small>[ March 24, 2003, 07:09 PM: Message edited by: MechMan ]</small>

LOnSLO

iTrader: (15)

Start the motor with the pass side valve cover off. It will run on four cylinders. Watch the rocker arm and valve spring on number 8, and see if oil is being pumped up through the pushrod. It will run over the spring. If you have oil, it's not a lifter. Is your oil pressure good at startup?

Bill00Formula

iTrader: (4)

Hey Brian,

Sorry to hear about your problems. When you get that car running right it's going to fly. I am sure you will figure it out soon.

MechMan

LonSlo
Ya Ill try that tommorow.
I have great oil pressure, even more than my fathers 02 Z28.

Ya Bill I cant wait to get a run in.
I know it has 134 traps in it. I just have to get this stupid knock figured out first.

MechMan

Ok I ran it a little bit ago, with the valve cover off, and they all oiled up.
Any other ideas guys?

BLUEBALLS ZZ

iTrader: (2)

bet they can tell you how much bore will equal what, but couldn't tell me a simple (do i need to natch the block for a stroker question) <img border="0" alt="[cry]" title="" src="graemlins/gr_cry.gif" />

mike02ss

I might be wrong but it sounds like a piston to valve issue. Might want to do a check on that one cylinder and see. Hope you find the problem soon would like to see you run.

BLUEBALLS ZZ

iTrader: (2)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by mike02ss:
<strong> I might be wrong but it sounds like a piston to valve issue. Might want to do a check on that one cylinder and see. Hope you find the problem soon would like to see you run. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">nope. stock heads t1 cam stock head did it. x1 stock heads did it, ported heads .5 more on compression did it. and no marks on the pistons. and springs were replace with the new cam.and lifters at this point in time,we are at the; scatch your *** mode now <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />

<small>[ March 25, 2003, 07:49 PM: Message edited by: BLUEBALLS ZZ ]</small>

BLUEBALLS ZZ

iTrader: (2)

oops

<small>[ March 25, 2003, 07:51 PM: Message edited by: BLUEBALLS ZZ ]</small>

BLUEBALLS ZZ

iTrader: (2)

oops

mike02ss

Hate to mention this but last time we tracked down the mysterious knock was on a turbo supra with nos and found after tearing down the engine completely that it was a broken wrist pin on one piston. Car didn't run any different but just had a knock. Hope this isn't your problem, but just a thought.

MechMan

Ya Mike,
Thats what we are thinking.
I guess we are gonna pull the motor next week and take a look around. It'll be a good time to forge the bottom end.

Pro Stock John

iTrader: (34)

"I know it has 134 traps in it..."

Spraying big?

I was thinking a bent or messed up wrist pin too...

MechMan

Ya John, Im spraying a TnT 150.
A few weeks ago I went 10.88@129
with just a T1 and stock heads.
Since then Ive done heads, and an X1 cam

strokedls1

iTrader: (1)

Maybe a casting flaw in the block that is restricting oil flow to that lifter. If everything else has been changed then we are really left with not a lot of possibilities. I wish I could be of more help, but p/v clearance would have been my initial guess as well.