Spun all 8 rod bearings - LS1TECH - Camaro and Firebird Forum Discussion

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Spun all 8 rod bearings

Old 12-04-2018, 11:00 AM
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Default Spun all 8 rod bearings

As the title states, I spun all 8 rod bearings. This was a fresh rebuild with less than 500 miles in my 2002 camaro. 799 heads, 232 cam, etc spin to 6800 ish maybe a tad higher. Rods mic'd and plastigauged at around .0015-.002 for clearance.
Using a melling 10296 High volume/High pressure pump. I'm getting feedback that this pump could be a culprit for my issues. Sucking the sump dry and drawing air...or clearances too tight for this pump...both of which mayhave caused my issues. I had good oil pressure for the first 100 miles then it started to dwindle and by the time I had enough and just pulled the motor, it was around 10 psi at idle and hardly any rise with rpm. (this was after switching to 20w50 to try and save the oil pressure)

Stock rods, stock rod bolts, clevite bearings.
Anything else I should look for while it's apart? I'll be getting the crank machined/polished and put back together with new bearings everywhere and a stock oil pump.

I should also mention that the pickup tube o ring used was correct (melling Black with the stock f body pickup tube) and looked fine when I tore it down...didn't seem pinched or rolled awkwardly.

Any ideas of other stuff to check? Places to look while it's apart before I put it back together and try again?

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Old 12-04-2018, 11:07 AM
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I'd have to check my book when I get home but isn't 1.5 pretty tight for rod clearance?
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Old 12-04-2018, 11:41 AM
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Post up some pics of the rods and the mains, tells a lot what could have happened. How did you set the rod clearance? Were the rod resized?
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Old 12-04-2018, 11:42 AM
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Don't you need AT LEAST .002 on rod bearings? It's been a while for me, so cut a little slack.... lol
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Old 12-04-2018, 12:10 PM
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When the rods get toasted, it always seems to be oil starvation. I never had a problem with a 10296 and an Fbody pan personally. I would be looking at the pickup to pan clearance. I’ve seen the oil pump spacer for a double roller installed upside down cause issues too. Blocked off about 1/3 of the oil passage.
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Old 12-04-2018, 12:20 PM
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Possibly something up w/ rod bolts?
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Old 12-04-2018, 12:29 PM
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Here's the rod bearings. They were checked at the machine shop then I double checked with plastigauge when installing just for peace of mind. .0015-.002 was pretty consistent.

Rods were not resized. Stock rod bolts torqued to factory spec.

Pan, pickup tube, windage tray are all the stock parts from GM. This is in a 2002 camaro so I didn't do any mixing and matching of pan/pickup like if I were doing a swap or something. I suppose I can check the screen to the bottom of the pan and measure the clearance if need be.

Always filled to 6 quarts.

no oil pump spacer

Thanks for all the replies guys!
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Old 12-04-2018, 01:03 PM
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run 7 quarts, pan holds it easily
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Old 12-04-2018, 01:18 PM
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What do the mains look like?
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Old 12-04-2018, 01:18 PM
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I've heard that more and more. it will get 7 from now on.

Do you think having 6 instead of 7 lead to the cause of this?
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Old 12-04-2018, 01:22 PM
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Mains were worn. Nowhere near as bad as the rods. Barely worn through the coating on 2 of them, coating still in tact on the other 3 but the coating looked like ****.

My assumption based on how everything looks, is I think the rods were the real problem and they went first, then just having the oil pressure drop let the mains get screwed.
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Old 12-04-2018, 01:33 PM
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They certainly are worn very evenly.
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Old 12-04-2018, 07:31 PM
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Since you have it apart, might want to upgrade to Katech rod bolts.
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Old 12-04-2018, 10:21 PM
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How many miles before the first oil change?
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Old 12-05-2018, 12:57 AM
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Interesting for sure. I wouldn’t suspect the pump being at fault here, although not really ideal for your clearances.

Who assembled the engine? And were the outer bearing shells installed dry?
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Old 12-05-2018, 01:22 AM
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Important question: Do the original 4th gen ls1 f-body oil pans that came with the ls1 cars, have an oil filter bypass for when the filter clogs? Because I know the ls1 filter itself, does not.

I have a new from GM replacement ls1 fbody pan on mine, not an original, and mine uses a different size of oil filter, and these oil filters all have an internal bypass valve in them. The ls1 filters do not have one, no matter the brand of filter.

Seeing as the oil filters that the original 4th gen ls1 pans that came with the cars don't have a bypass in them at all, is there a bypass in the pan itself for when the filter blocks?

In my previous ls1 swapped vehicle I had a custom canton oil pan with no bypass valve on the oil filter adapter that came with it, and it used the ls1 style filters which as I said above none of them have an internal bypass valve in them. Well the first K&N filter I used blocked after 1000 miles and my oil pressure dropped to 5psi. Luckily I was near home I got it back no damage. Then the same thing happened again. 2 new filters, both blocked up in no time.

Since then, that car was pulled apart and i fitted that same engine above into my 94 Camaro with the new GM replacement oil pan that uses the newer style of filters.. and I haven't had the oil pressure drop on me once and the engine is still going strong.

All of these oil filters are so small that they clog up fast even if you don't have any engine damage, even with no bearing material going through them. I had no metal in the filters.
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Old 12-05-2018, 08:31 AM
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Old style pans had the bypass in the pan, new style have the bypass in the filter.
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Old 12-05-2018, 09:37 AM
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100 miles before first change

I put the engine together

Outer shell of bearing was dry as was the rod...inner face that rides the crank got assembly lube

stock 2002 pan/pickup/windage/baffle
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Old 12-05-2018, 10:22 AM
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Definitely looks like oil starvation... not a clearance problem.

Did you use the correct pickup tube O-ring? Was it intact at teardown?

Did you by any chance use a cooler bypass plate that has a pressure sensor port in it? Reason I'm asking is, some pressure sensors will protrude so far into that passage, that they almost completely block it off.

I have that pump in my truck. Works fine.
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Old 12-05-2018, 10:35 AM
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Was the top end noisy?
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