Knockin' On Heaven's Door, what to do for a rod knock?

[MrSony]

I'm gonna take the top end off so it's just the block and the rotating assembly to further inspect it.

 

[ttype]

Here's how much difference I found on bolt-on parts. Yeah, there are better blancers out there, and worse...

The yellow mark was the first one I used (just so I could be IN the ballpark when the game started) and the white one I did once I went down from the bleachers. No fancy store bought tools here. Well... a homemade piston stop tool, a cable splicer's knife and a measuring tape.i'm not just talking as many degrees as thewidth of a paint marker here, it is indeed substantial. I couldn't hear the fan whirring with the first mufflers, the second ones let me hear the MSD box on that side of the engine compartment.

I'll get a dark line in the next balancer's marker/identifier, and use tin snips to carve a fine point in the timing tab that means zero.

 

[ttype]

i try to tune mine for the crappiest gas i can't avoid. i'm not always at the same gas stations all the time. 125 miles between them some times. different story once i get to where i'm going...

 

[pontiacgp]

Here's how much difference I found on bolt-on parts. Yeah, there are better blancers out there, and worse...

The yellow mark was the first one I used (just so I could be IN the ballpark when the game started) and the white one I did once I went down from the bleachers. No fancy store bought tools here. Well... a homemade piston stop tool, a cable splicer's knife and a measuring tape.i'm not just talking as many degrees as thewidth of a paint marker here, it is indeed substantial. I couldn't hear the fan whirring with the first mufflers, the second ones let me hear the MSD box on that side of the engine compartment. View attachment 60721

I'll get a dark line in the next balancer's marker/identifier, and use tin snips to carve a fine point in the timing tab that means zero.

the 350 harmonic balancer and a 305 harmonic balancer have a 10° difference for TDC

 

[pontiacgp]

Both were scarred, if that's what you mean. The rod half was flattened out in the middle, like it was being pushed down super hard... which also leads to the detonation problem it had towards the end. R45tsx plugs, .045 gap, accell super stock 8mm wires, brand new HEI dizzy from TA. May have also been the carb air valve doors being a smidge too tight, but that wouldn't cause the erratic idle when the vacuum advance was plugged in or the detonation.

You'll bend a rod or break the crank before you compress a bearing. The rod bearing is suspended on a layer of oil and never touches the crank.

 

[lilbowtie]

The bearing wasn't compressed - it was beat out.

 

[pontiacgp]

Beating on something compresses it but I'm not going to argue semantics. The lack of an oil barrier permited the bearing to come in contact with the crank. I hope he finds out what caused the problem before he puts money into the engine and ends up with the same problem

 

[MrSony]

As stated before, I think the problem was simply repeated 6 grand pulls on a stock (mostly) motor designed to top out at 4200 is a no no. Plus or minus a tuning problem with a hint of detonation also didn't help.

 

[ttype]

the 350 harmonic balancer and a 305 harmonic balancer have a 10° difference for TDC

around here, there are "paycheque" parts clerks, and parts pro's... when that right parts person(i can think of a couple o' well versed parts gals in these parts...) is found, you tend to NEED to know their schedules or ya just wasted a trip.(or phone call)

my pal needs a water pump for his 496 crewcab work truck, in a 88. several trips are required to get the "right" stuff most of the time... as annoying as that is, it's becoming a fact of life. it's akin to knowing "which" '71/72 "400" to buy parts for(2bbl or 4bbl)
location location location...

getting rid of the old granny 4 speed, to uhhhh... modernize it with a zf6-650 was shall we say... challenging?

location location location. i like my "boony" living, but there are just some things only a city can provide.

 

[pontiacgp]

As stated before, I think the problem was simply repeated 6 grand pulls on a stock (mostly) motor designed to top out at 4200 is a no no. Plus or minus a tuning problem with a hint of detonation also didn't help.

the limits of the revs on an engine are due to the valve train limitations, not the main or the rod bearings.