mytrplseven

What is it about the #2 rod bearing and it's failures? Is it unique to only the higher HP engines or does the N/A suffer this malady as well? I pulled my rod bearings when the oil pan gasket was replaced and even though they all looked like new, I replaced them, nonetheless. I'm hoping this will prevent any problems in the future, if the N/A among the affected motors.

V2Rocket

I just tore down an all-stock 951 engine and it had SHREDDED the #2 bearing. Nothing but shrapnel left over, and the crank journal is ground down 0.6mm.

It's due to the oil supply to the bearing - flow isn't that great to begin with, and starving it in hard corners etc doesn't help.

M758

oil flow is weak to the #2 bearing. It works fine in normal street driving when the system is working well. However when have more hp, more rpm, more cornering loads, higher oil temps, worn components ... it all take margin away and increases possiblity of starving the bearing for oil. Once it does even for a second it spins and bang...

hacker-pschorr

My 100% stock 944S coughed up #2 with 112,000 on the odo. Never tracked and full records with 3k - 4k oil changes.

I autocrossed it once, maybe that did it.

bordin34

I was worried about mine when I autocrossed it so I added an extra 1/4 quart of oil. I figured that wouldnt be enough to overfill and foam but would give me a tiny amount of insurance.

MAGK944

It happens and there are numerous precautions to avoid it. Cross drill #2 crank journal, oil pick-up tube shroud, sump baffle plate, windage ports. Tracking and autocrossing will promote failure due to higher g's not normally seen on the street.

gums

Most of us try to at least slightly overfill to get a little extra insurance on this

mytrplseven

Thanks, guys. Since I'm in Florida where it's straight and flat I guess I shouldn't have to worry.

TexasRider

Just like you I replaced all mine when I was going all through the car at 91,000 miles. Just because. And just for insurance.

Interestingly when we were going out for a track day I added about 1/3 quart to the oil system which was measured and full at the mark on the stick and freshly changed too. I have always had the oil pressure gauge be bouncing around when the oil is hot and when the car comes back to idle. After adding the 1/3 quart the oil pressure settled nicely at idle. This was in just street driving. It seems it likes it.

xsboost90

Under cornering if oil sloshes away from the pick up tube number 2 is the first to starve of oil

gums

my car is in the shop having rod end bearings replaced as we speak, for the first time since I've owned it, and after 4 full seasons of racing. Will be interesting to see their condition.

Triple_T

LR opens the journal walls to stop foaming, see link...approx 2/3rds way down page.

http://www.lindseyracing.com/hptalk/0808.htm

VirginiaF1

Howdy..
1. Are there any known instances where these 4 precautions, when taken, have still allowed a spun #2?
2. Or are these 4 steps taken together such a rarity among racers/ x-crossers; thus too small a population to make measure?
3. Lastly, which of those 4 is least costly and thus best solution for strictly street drivers?
TIA!

jcslocum

Sounds like an accusump might help this condition a lot for track type driving.

Ben951S

So maybe I should be topping off the oil every time I get gas... Just like the little flap tells us to!