Running925

hey guys. I was at the track makin some passes & after one of my passes i noticed low oil pressure. I then switch my tires back over & went home, didn't wanna abuse it any furter. The low oil pressure was due to the increased clearances on my main bearings. I'm just trying to figure out what caused the mains to get squished like this.

Any information is helpful. I can take more pix of stuff if need be.

The center main was the worst.











I'm throwin in a new crank & a fresh set of ACL bearings to resolve this for now, but i really would like to figure out how this happened so that i can make sure it doesn't happen again.



Setup:
Dart Block 2.0
Eagle crank / rods
CP 9.0:1 Pistons
Dart Head (oversized valves, full valve train, stock GSR cams)
Garrett t3/t4 (.60/.63)

mrbsponge

what brand and weight of oil were you using? did all the other bearings look okay? or was it just thins one single bearing?

that groove in the middle on the far is edge is what has me.

have you ever strained your oil when you changed it?

any trash or debris in the pickup of the pump or in the pan, other than what was from the bearing?

SOHFAST94

What engine combination?

Running925

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mrbsponge &raquo;</TD></TR><TR><TD CLASS="quote">what brand and weight of oil were you using? did all the other bearings look okay? or was it just thins one single bearing?

that groove in the middle on the far is edge is what has me.

have you ever strained your oil when you changed it?

any trash or debris in the pickup of the pump or in the pan, other than what was from the bearing?</TD></TR></TABLE>

The other main's looks similar like they were starting to brake down, but the one pictured was the worst. It was the center main.

Only debris in the pan was a bunch of bearing material. I've run both 10w30 synthetic and 10w40 conventional in this motor. It's only got about 1600 miles on it at this point.

There was a couple chunks of bearing stuck in the pick-up screen but nothing that would stop it from suckin up oil. I strained the oil the last change at 1000 miles and everything was clean. I use a paint strainer for my spray gun. It's extreamly fine.

Motor combo is in the Origional Post, below the photos.

non-VTEC

was the eagle crank new or used? what bearings are those? what were the clearences?

was the crank checked prior to installation?......i have been hearing some strange stories about qualitly control on the eagle cranks.....

95dxsir2

who put the engine together? blue printed?

Running925

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by non-VTEC &raquo;</TD></TR><TR><TD CLASS="quote">was the eagle crank new or used? what bearings are those? what were the clearences?

was the crank checked prior to installation?......i have been hearing some strange stories about qualitly control on the eagle cranks.....</TD></TR></TABLE>

eagle crank was new from a few years ago. Those were clevite bearings. i believe clearances were .0015 on all.

Crank was indeed checked for balance and straightness.

I'm gonna plasti-gauge the new stuff tomarrow and i'll let you guys know the results.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95dxsir2 &raquo;</TD></TR><TR><TD CLASS="quote">who put the engine together? blue printed?</TD></TR></TABLE>

I did this one, as well as 7 others over the years.

95dxsir2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Running925 &raquo;</TD></TR><TR><TD CLASS="quote">I did this one, as well as 7 others over the years.</TD></TR></TABLE>
not bashing
according to all data, main bearing clearence is .020" #3 @ .024"
just letting you know, but then again, this is a built/race engine

non-VTEC

what does the journal on the crank look like? is the crank re-usable again or its it junk now?

alpha

What crank pulley are you using? Seems like either something is way out of balance or detonation from http://i35.photobucket.com/alb...3.jpg

A.E Motoring

iTrader: (1)

how does your crank look? pics of the journals? looks like it would have some bad scarring on the journals if the bearings look like that

Sr420Det

Damn I told you about riding them fat bitches around. jj Im assuming its a stroked motor right?

RedneckRicer

ive heard horror stories about eagle cranks. how they still have some debri in the oil control holes and ive seen a few pix of them that have snapped and caused some serious carnage.

sal

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Running925 &raquo;</TD></TR><TR><TD CLASS="quote"> i believe clearances were .0015 on all.

I'm gonna plasti-gauge the new stuff tomarrow and i'll let you guys know the results.

</TD></TR></TABLE>

Was plasti-gauge all you used to check the clearances when you assembled the motor, or did you actually mic the journals and main caps?

Running925

gonna try & answer all these questions. Sorry if i miss anyone, i've been swamped with work & havne't had a chance to get back to my motor.

I can tell you that the new crank along with the ACL bearings will not be able to just go in there due to the clearances being to tight on the mains.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by non-VTEC &raquo;</TD></TR><TR><TD CLASS="quote">what does the journal on the crank look like? is the crank re-usable again or its it junk now?</TD></TR></TABLE>

crank would probly need turned to be usable again.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alpha &raquo;</TD></TR><TR><TD CLASS="quote">What crank pulley are you using? Seems like either something is way out of balance or detonation from http://i35.photobucket.com/alb...3.jpg</TD></TR></TABLE>

using stock crank pulley

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by A.E Motoring &raquo;</TD></TR><TR><TD CLASS="quote">how does your crank look? pics of the journals? looks like it would have some bad scarring on the journals if the bearings look like that</TD></TR></TABLE>

not real bad but it will need some work, i'll try & remember to grab some pix of it in the next day or so.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sr420Det &raquo;</TD></TR><TR><TD CLASS="quote">Damn I told you about riding them fat bitches around. jj Im assuming its a stroked motor right?</TD></TR></TABLE>

i'm using the stock LS stroke

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RedneckRicer &raquo;</TD></TR><TR><TD CLASS="quote">ive heard horror stories about eagle cranks. how they still have some debri in the oil control holes and ive seen a few pix of them that have snapped and caused some serious carnage. </TD></TR></TABLE>

that was not the issue, this crank was cleaned thouroly before use and there wasn't anything in it anyways.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sal &raquo;</TD></TR><TR><TD CLASS="quote">

Was plasti-gauge all you used to check the clearances when you assembled the motor, or did you actually mic the journals and main caps?</TD></TR></TABLE>

yes, plasti gauge was all i had as a referance. I've since purchased a mic. I hope to continue to improve my tooling. Workin with what i have.. ya kno.

HiProfile

You have to make the oil passages rediculously clean when assembling. I'm sure you know, but especially with aftermarket cranks/blocks, you have to REALLY clean those passages, check & recheck. It doesn't take much to start eating a bearing. If you have some old, oddball unused bearings, sprinkle a few specs of dust on them & torque it down. You will see the indentations in the top bearing layer where each particle fell.

Outside of that, I'd say it may have had help from running the motor [hard] w/o oil at running temp, or letting it sit for a long time. With a loose motor, there's a chance too much seaped out while it sat, removing the critical protection at & right after startup. They make oil pump primer sticks for most V8's for a reason.

Running925

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HiProfile &raquo;</TD></TR><TR><TD CLASS="quote"> They make oil pump primer sticks for most V8's for a reason.</TD></TR></TABLE>

that would be pretty cool to have for our motors.

I've chalked it up to the tightness of the clearances on the mains. It was on the tight end of the allowable tolorance and i've talked to a bunch of v8 builders over the last few days and they are telling me that they run on the loose end of their tolorance for their race motors.

Regardless mine is to tight to re-assemble being slightly tighter than .001 So i'm going to be talking to my machineist today about an align bore and giving him the bearings that i'm planning to use so that he can generate the correct clearances.

non-VTEC

why not get some of the thinnest OEM honda bearings to get it on the looser side rather than machining/honing the main bores.

pwrofdrm

Correct me if I'm wrong, but couldn't this be caused by detonation?

I was once told that prolonged detonation or a misfire could lead to squished bearings...

DANNYCAVS

hey i think i have the same problem. was oil pressure low at idle then picked up when driving? and please post pics of the metal pcs you found in the oil.thanx