What is with Rod Bearings dying? - 3000GT/Stealth International Message Center

Patryn · 12-31-2007, 02:23 PM

Engine with approximately 5,000 miles on it, new crank and bearings, balanced and a rod bearing goes after only a year. What is the point of upgrading pistons or rods, when it is always the bearings that go? Is there some way to make that part of the engine bullet proof? I think I'm going to rebuild this thing, so if anyone has ideas throw them out there. If I spin another rod bearing, the car is going to well, something.....

Erron Spalsbury · 12-31-2007, 03:53 PM

Was the oil pump replaced during the rebuild? What was the pressure when it died?

Patryn · 12-31-2007, 03:57 PM

Yeah, the oil pump was replaced, oil cooler and turbos flushed, to get rid of any bearing material. Oil pressure has always been good usually 20-25psi at idle and upwards of 50-70 during cruise. I installed an electronic oil pressure guage to do away with the crap stocker. I don't know what the pressure was, because it developed a slight knock while it was being dyno tuned.

Is there a bullet proof bearing out there, clevites go just as well as stockers.

JasonY · 12-31-2007, 03:59 PM

well, if it began to fail when you really started pushing it, id suspect it wasnt built properly.

Jason

Patryn · 12-31-2007, 04:02 PM

But it drove just fine for 5,000 miles, and I had the engine balanced. The machine shop that did the work is good, real good. I worked with the guy on couple of peoples cars and his specialty was mostly racing engines, or thats where a lot of his customer base came from. I've had the car running 15 psi, it blew at only 8psi and a 10 afr.

JasonY · 12-31-2007, 04:22 PM

Get an oil analysis done. 10:1 could get a lot of gas into the oil, especially on a fresh engine.

Jason

91vr4n00maxima · 12-31-2007, 04:36 PM

diluted oil and possible out of round rod due to previous failure.

Patryn · 12-31-2007, 06:17 PM

The rod was replaced where it had spun. The rest were fine. Would 5000 miles on an engine still be fresh, pretty much broken in by that point. I'll look into the oil analysis though.

92stealth15g · 01-01-2008, 03:28 AM

Was the engine broken in properly? I have heard if you hot rod within the first few hundred miles of a rebuild you will have problems and spin bearings real quickly.

beckerb · 01-01-2008, 04:21 AM

Quote:

Originally Posted by JasonY

Get an oil analysis done. 10:1 could get a lot of gas into the oil, especially on a fresh engine.

Jason

What A/F ratio would you recommend on a newly rebuilt engine ?

12-31-2007, 02:23 PM	#1 (permalink)
Patryn Forum Member Join Date: Sep 1999 Location: Walnut Hill, FL. Esc Drives: 3000gt VR4 Trader Rating: (24)	What is with Rod Bearings dying? Engine with approximately 5,000 miles on it, new crank and bearings, balanced and a rod bearing goes after only a year. What is the point of upgrading pistons or rods, when it is always the bearings that go? Is there some way to make that part of the engine bullet proof? I think I'm going to rebuild this thing, so if anyone has ideas throw them out there. If I spin another rod bearing, the car is going to well, something..... __________________ 1998 VR4: SS Downpipe, Borla Cat-Back, Open Element Air Filter, ACPT CFDS, DN Intake Pipes, Front & Rear Strut Tower Bars, Deftracing 575 Hood, Blitz DSBC, Vacum Redution, Krank Vents, Titan Headers w/ Big TD05 16G Turbos,

12-31-2007, 03:53 PM	#2 (permalink)
Erron Spalsbury Smooth and Fast Join Date: Aug 2001 Location: On the Circuit Drives: E-Mod Race Car Trader Rating: (13)	Re: What is with Rod Bearings dying? Was the oil pump replaced during the rebuild? What was the pressure when it died? __________________ Want to see a hot lap of my Stealth? http://3svideo.vidiac.com/video/acfd...6e012f3f5d.htm Or, drag racing... http://3svideo.vidiac.com/video/c07a...b801720019.htm www.stickyvinylgraphics.com Custom vinyl and yes, now accepting aps for 2009 sponsorships! (Cars, Planes, and Bikes) More pics of my car... http://profile.imageshack.us/user/Blueveloscity/

12-31-2007, 03:57 PM	#3 (permalink)
Patryn Forum Member Join Date: Sep 1999 Location: Walnut Hill, FL. Esc Drives: 3000gt VR4 Trader Rating: (24)	Re: What is with Rod Bearings dying? Yeah, the oil pump was replaced, oil cooler and turbos flushed, to get rid of any bearing material. Oil pressure has always been good usually 20-25psi at idle and upwards of 50-70 during cruise. I installed an electronic oil pressure guage to do away with the crap stocker. I don't know what the pressure was, because it developed a slight knock while it was being dyno tuned. Is there a bullet proof bearing out there, clevites go just as well as stockers. Last edited by Patryn : 12-31-2007 at 06:18 PM.

12-31-2007, 03:59 PM	#4 (permalink)
JasonY Fool...No man can kill me Join Date: Jul 2002 Location: Lower Delaware Drives: TT = Design Flaw.... Trader Rating: (26)	Re: What is with Rod Bearings dying? well, if it began to fail when you really started pushing it, id suspect it wasnt built properly. Jason __________________ "Busting your butt doesn't guarantee success but sitting on your butt will pretty much guarantee failure" Quality parts and service from I.P.S. And yeah, ^^^ is a real one... 2001 Silver Dodge Ram/Cummins diesel - tow vehicle for ^^^

12-31-2007, 04:02 PM	#5 (permalink)
Patryn Forum Member Join Date: Sep 1999 Location: Walnut Hill, FL. Esc Drives: 3000gt VR4 Trader Rating: (24)	Re: What is with Rod Bearings dying? But it drove just fine for 5,000 miles, and I had the engine balanced. The machine shop that did the work is good, real good. I worked with the guy on couple of peoples cars and his specialty was mostly racing engines, or thats where a lot of his customer base came from. I've had the car running 15 psi, it blew at only 8psi and a 10 afr.

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12-31-2007, 04:22 PM	#6 (permalink)
JasonY Fool...No man can kill me Join Date: Jul 2002 Location: Lower Delaware Drives: TT = Design Flaw.... Trader Rating: (26)	Re: What is with Rod Bearings dying? Get an oil analysis done. 10:1 could get a lot of gas into the oil, especially on a fresh engine. Jason

12-31-2007, 04:36 PM	#7 (permalink)
91vr4n00maxima est. sept, 2000 Join Date: Sep 2000 Location: vancouver, wa Drives: slow 97 VR4 Trader Rating: (17)	Re: What is with Rod Bearings dying? diluted oil and possible out of round rod due to previous failure. __________________ 97 VR4 12.417@111.16 9b time. full weight almost BPU 95 mark viii. 14.35@98 03 cobra vert. 4 mods=118mph traps 91 stealth TT. td05 18G, heads/cams, 3000lbs

12-31-2007, 06:17 PM	#8 (permalink)
Patryn Forum Member Join Date: Sep 1999 Location: Walnut Hill, FL. Esc Drives: 3000gt VR4 Trader Rating: (24)	Re: What is with Rod Bearings dying? The rod was replaced where it had spun. The rest were fine. Would 5000 miles on an engine still be fresh, pretty much broken in by that point. I'll look into the oil analysis though.

01-01-2008, 03:28 AM	#9 (permalink)
92stealth15g Certified White Boy Join Date: Aug 2007 Location: Laramie, Wyoming Drives: 1992 Stealth RT/TT Trader Rating: (3)	Re: What is with Rod Bearings dying? Was the engine broken in properly? I have heard if you hot rod within the first few hundred miles of a rebuild you will have problems and spin bearings real quickly. __________________ "Clutch-Eater" -1992 Dodge Stealth R/T Twin turbo AWD, Dynamic Racing stage II heads, 99 lifters, 6-speed Getrag from 99 vr4, SPEC Stage 4 clutch, TEC 15g's, Greddy blow off valve, Dejon Powerhouse Blow-Thru Intake Pipes, DSM sidemounts, Denso fuel pump, 550cc fuel injectors, Apexi SAFC, HKS VPC, Apexi AVCR, msd ignition dis-4, MSD 8.5mm wires, NGK coppers 1 stage colder, alamo y-pipe, custom exhaust from turbos back, highflow cat, Lowered, Nitto tires. "Knockin' Beater" -1996 Mitsubishi Eclipse GS