Need Help -- Knocking 440 Sound

[fastmark]

Neighbor rebuild 87 Turbo GN had some problems with oil pressure. Looked at the speed shop screw up resizing the rods. Owner kid did the rods they weren't square with wrist pin.

improperly resized rods or bent rods show up in bearing wear. This is a piston problem or clearance problem.

 

[Ernie ingling]

Think I know why Muscle Motors is defunct

 

[PRHeads]

Be interesting the hear what the report card from the machine shop looks like regarding bore sizing uniformity.

I’ve seen several finish machined blocks that were “ready to assemble” where the bores were well undersized down at the very bottom.
Like “0” clearance.

 

[Fran Blacker]

Anything wrong with wrist pin. I don't know about wedge piston pins, assume pin is pressed into piston. Maybe one of the holes piston or the rod is oversized, causing the noise? Could there be a crack piston oil ring groove or in top or second groove?

 

[Dave6T4]

I bought a new Superbee, 383, in 1969. After about 3 months, it developed a knock. I thought it was possibly a bent pushrod. It went back to the dealership, and they discovered it was a bent connecting rod. They fixed it under warranty with no questions. They showed me the bad rod and piston. Piston was scuffed up on one side, but could not see any thing visually wrong with the rod although mechanic confirmed it was bent. The service manager said they had a bulletin about a problem with the Road Runnner / Superbee engines.

 

[Johnpat]

To find which cyl has a possible problem,pull a plug wire at a time.
When the knock goes away it's that cyl that has a problem.
If it's a rod bearing it will stop

 

[RemCharger]

Pulling the spark plugs one at a time makes does very little for the knocking sound, BUT when the #1 cylinder wire is pulled, when you put the plug wire back into the distributor cap, the very first spark makes the knock loud...ONCE. Just like a "pop" knocking sound, and then a continuous lower knocking sound.
Armed with that, I figured it was the rod bearing....but:

 

[Fran Blacker]

To find which cyl has a possible problem,pull a plug wire at a time.
When the knock goes away it's that cyl that has a problem.
If it's a rod bearing it will stop

Been done.

 

[Mark Barnes]

Be interesting the hear what the report card from the machine shop looks like regarding bore sizing uniformity.

I’ve seen several finish machined blocks that were “ready to assemble” where the bores were well undersized down at the very bottom.
Like “0” clearance.

X2. Always want to hear if your guess was close...in case it happens to you. Let us know what you find out.

 

[Moparnocar]

Here's my noise, motor supposed original, sat for 20+ years, I can't figure it out either 1965 413

https://youtube.com/shorts/3bFRqbXbk8w?feature=share

 

[Dave6T4]

Here's my noise, motor supposed original, sat for 20+ years, I can't figure it out either 1965 413

https://youtube.com/shorts/3bFRqbXbk8w?feature=share

That is lifter noise. After 20 years of sitting with valve spring pressure on lifters, they have bled down. One or more have not pumped back up. You can pull valve covers and feel which rockers are loose.

 

[Moparnocar]

That is lifter noise. After 20 years of sitting with valve spring pressure on lifters, they have bled down. One or more have not pumped back up. You can pull valve covers and feel which rockers are loose.

I did that on the drivers side, and ran without the cover, nothing found. Sure sounds like the driver's side

 

[fastmark]

Collapsed lifter is correct.

 

[Challenger340]

Pics as requested. They are icon pistons apparently, but I don't see anything significantly askew with the rod.

View attachment 1095524 View attachment 1095525 View attachment 1095526 View attachment 1095527

I believe I told you so on post #36 ?

THAT is a collapsed Piston ?

LOOK at the abnormal skirt wear !

Take a Mic to the Piston skirt.... the Piston is tweaked ! and it has LOST it's ability to go from OVAL when COLD and become ROUND when HOT.

Please re-read Post #36 as to the causes of this condition typically when seen at the front of the Engine on #1 or #2 cylinder

 

[Challenger340]

There is NOTHING WRONG with that connecting Rod.... it is straight because the scuff lines are perfectly VERTICAL up and Down the skirt !

The reason the scuffing is oddly shaped ..... is once AGAIN.... same as I described in Post #36.... water/coolant being added to the Engine running/at temps which caused the front cylinder to contract UNEVENLY around the superheated Piston !

 

[Moparnocar]

What

There is NOTHING WRONG with that connecting Rod.... it is straight because the scuff lines are perfectly VERTICAL up and Down the skirt !

The reason the scuffing is oddly shaped ..... is once AGAIN.... same as I described in Post #36.... water/coolant being added to the Engine running/at temps which caused the front cylinder to contract UNEVENLY around the superheated Piston !

What do you mean, water being added?

 

[Moparnocar]

There is NOTHING WRONG with that connecting Rod.... it is straight because the scuff lines are perfectly VERTICAL up and Down the skirt !

The reason the scuffing is oddly shaped ..... is once AGAIN.... same as I described in Post #36.... water/coolant being added to the Engine running/at temps which caused the front cylinder to contract UNEVENLY around the superheated Piston !

Nevermind, read your post, thanks

 

[Bee1971]

Will bee interesting on what the other seven pistons look like - I run Icon pistons that where part of the 440 Source Stroker kit

Sorry man , this sucks

Looks like a beautiful beautiful car

I think I learned something today on post #36 - Interesting

 

[Challenger340]

Will bee interesting on what the other seven pistons look like - I run Icon pistons that where part of the 440 Source Stroker kit

Sorry man , this sucks

Looks like a beautiful beautiful car

I think I learned something today on post #36 - Interesting

IMO,
ICON are an extremely good Piston product, very well thought out and much under-rated in terms of design / quality versus Price.

 

[Moparnocar]

I did that on the drivers side, and ran without the cover, nothing found. Sure sounds like the driver's side

My sound sure sounds like the op's sound. I'll pull the pass cover in a bit and check it tho, with a stethoscope, it seems to becoming somewhere under the intake