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Author Topic: Spun a rod bearing, what did i do wrong?  (Read 3842 times)
ford rules
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Location: Brighton MI

« on: July 19, 2017, 04:23:33 pm »

Ok guys, I got my 351 running over the weekend and had about 5 hrs on it when it developed a knock.
the build consisted of
.030 block
mains align hones with arp studs
stock crank polished, not cut
RPM I beam rods
HV oil pump
Wiesco pro tru street flat tops
custom cam from ford strokers
AFR 205's
Performer RPM air gap
I checked clerances with a mic/t guage and double checked with a bore guage. I did not check the rod big end DIA. though and im thinking that's where my problem lies. Im guessing the rod big end dia was to large not providing sufficient crush.
I primed the engine with a drill and rotated it 1/4 turn at a time till I had oil flowing through all the push rods.
For engine break in I started and let it run till it got to temp, shut it off checked fluids and went and drove it. Running up to about 4500rpm in 2nd and 3rd and let it engine break. After that everything seamed good nothing out of the normal.

Heres some pictures.




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juiced coupe
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« Reply #1 on: July 19, 2017, 05:36:03 pm »

Photobucket changed their rules, basically fucking up most of the forum threads ever made.

Luckily, this forum has the option to attach photos directly. Its in the additional options box, on the lower-left side.
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Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
ford rules
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« Reply #2 on: July 19, 2017, 06:31:20 pm »

Here we go!


* IMG_7071.JPG (1417.4 KB, 3264x2448 - viewed 201 times.)
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ford rules
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« Reply #3 on: July 19, 2017, 06:33:24 pm »

Another


* IMG_7074.JPG (1460.65 KB, 3264x2448 - viewed 183 times.)
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ford rules
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« Reply #4 on: July 19, 2017, 06:34:15 pm »

Another


* IMG_7078.JPG (1780.59 KB, 3264x2448 - viewed 166 times.)
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ford rules
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« Reply #5 on: July 19, 2017, 06:35:14 pm »

Last two


* IMG_7072.JPG (1344.67 KB, 3264x2448 - viewed 181 times.)

* IMG_7073.JPG (1282.01 KB, 3264x2448 - viewed 229 times.)
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ford rules
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« Reply #6 on: July 19, 2017, 06:36:05 pm »

Another


* IMG_7075.JPG (1288.72 KB, 3264x2448 - viewed 163 times.)
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juiced coupe
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Big Block
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The land mass between New Orleans and Mobile


« Reply #7 on: July 19, 2017, 09:35:41 pm »

All 8 rod journals measured the exact same? Seriously?

And it wasn't machined.
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Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
347HO
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I believe they landed on the moon.


« Reply #8 on: July 19, 2017, 10:27:40 pm »

Kinda looks like the bearing didn't fit...  Specially at the radii
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... it was REALLY revving at like 4K...
If I saw that thing in my rear view Im pulling over to let you by, I be scared of that thing Huh? i dont know wich car is uglier ur or mine?
Javier
Ugly?  Easy now -- that's my baby and it's got lots of unique character!  When I drop that built 445" stroker in it you won't have any time to "pull over to let me pass" because I'll have already blown past you when you figure out what the hell was that loud noise behind you . . .  
ford rules
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« Reply #9 on: July 20, 2017, 06:01:13 am »

All 8 rod journals measured the exact same? Seriously?

And it wasn't machined.

It was polished, but not cut. I couldn't believe it so I double checked it a few times lol
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ford rules
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« Reply #10 on: July 20, 2017, 06:06:16 am »

Kinda looks like the bearing didn't fit...  Specially at the radii
I guess its possible, but the bearing is all smashed out in the pics though making it look wider. I didn't notice anything different on these as far as width. When I installed each piston/rod I always roll the motor to make sure nothing is binding up.

The only thing I will say I did notice was it did not take much effort to seat the bearing into the rod housing. Hard to explain but they usually seam to almost snap down in and it seams some of them did not. hence me thinking the big end rod diameter is the culprit.
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ford rules
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« Reply #11 on: July 20, 2017, 06:52:38 am »

So what is everyones opinion on where to go with this thing now, im tempted to just buy a 393 or 408 rotating assy for it. My only question is should I go to .040 bore so it has a fresh hone for the new rings?
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Bam54
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« Reply #12 on: July 20, 2017, 09:09:02 am »

We're they new rods and what bearing did you use? With the way the radi looks you should have had a H bearing (narrowed for aftermarket cranks with larger radi) in it. But it is hard to tell

Bam
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ford rules
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« Reply #13 on: July 20, 2017, 09:16:39 am »

New RPM rods clevite p series bearings and a stock uncut crank. Bearing PN cb831p
I was always under the impression the stock cranks used the p series? the bearing in the picture is smashed out wider, ill take some pictures tonight of the others.
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ford rules
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« Reply #14 on: July 21, 2017, 04:37:01 pm »

Any other ideas?

I called and ordered one rod, im going to have all 8 checked and throw in another stock crank I have.
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