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#1 |
Scooby Specialist
Member#: 1170
Join Date: Mar 2000
Chapter/Region:
BAIC
Location: San Jose, CA
Vehicle:2005 STi White |
![]() Hey guys, after doing a search on rods I only found 1 person with rod problems and that was Adam. It was always the pistons or the heads and the rods were fine. I also read on here something about flooring it at 50mph in 5th (oops i have a 4EAT
![]() So I'm wondering...when do the rods need to be changed out?
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#2 |
Worst Mod Ever
Moderator Member#: 369
Join Date: Oct 1999
Chapter/Region:
SWIC
Location: Phoenix, AZ
Vehicle:19 CTS-V, 18 XC90 17 GTI |
![]() Probably not until well over 300hp.
I put forged rods in mine since it was being opened up anyway. I figured spending a little more money was preferable to having a rod stick out of the block. ![]() BTW I know of another rod related failure but that was with a 2.2 motor and 18psi or so... |
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#3 |
Scooby Specialist
Member#: 1170
Join Date: Mar 2000
Chapter/Region:
BAIC
Location: San Jose, CA
Vehicle:2005 STi White |
![]() im thinking that i will NOT need to change out the rods. and since im opening up the engine i wanted to weigh all of my options. my goal is like 10psi from a T28 so its not very high of a goal. so i figure ill just get some stronger pistons and rings and be done with that.
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#4 |
![]() Moderator Member#: 922
Join Date: Feb 2000
Chapter/Region:
MWSOC
Location: Schaumburg, IL
Vehicle:16 WRX (white) 04 FXT (red) |
![]() Rods are needed for high-torque situations. Low-spoolup, high-pressure turbo applications will see a failure of rods much more then a high-spool, high-boost application. I have seen a completely screwed WRX engine because a rod gave/blew up/tore everything else up in there. Was not pretty, but was impressive.
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#5 |
Scooby Specialist
Member#: 14141
Join Date: Jan 2002
Location: [email protected] @ 5800 ft on 13T
Vehicle:2002 Impreza WRX |
![]() Connecting rods on most engines are good for about 2x the stock horsepower with no changes.
The inertial stresses on the connecting rod are actually higher than the loads cause by engine power. The most stressful period in connecting rods life is the transistion from the upstroke during the exhaust cycle and the down stroke on the intake cycle. Most failures attributed to rod failure are actually lubrication failures (spinning a bearing ) or failures of the rod bolts due to improper torquing during an engine rebuild. The other killer of connecting rods is long term high rpm operation. Before I would replace stock connecting rods I would just have them blueprinted if you are going to rebuild the engine any way. Most important is deburr and shot peen the rods if you plan on making high power output. Around 450 hp is where I would begin planning on using aftermarket forged rods. Larry |
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#6 |
Scooby Newbie
Member#: 12115
Join Date: Nov 2001
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![]() Larry,
You are a far braver man than I. I've had two friends total engines because their rods let go, both had circa 350bhp ATF, both were STi engines. Personally, I think they were both a little unlucky, but still recommend forged rods for anyone intending to run circa 350bhp/330ftlbs +. Happy. |
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#7 | |
Sooby Guru
Member#: 1914
Join Date: Jul 2000
Chapter/Region:
SWIC
Location: 2014 Q60S, 2016 Chevy SS
Vehicle:2000 2.5RS w/ EJ22T swap and N20. gone. : ( |
![]() Quote:
Eric PS: It wasn't my car |
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#8 |
Scooby Specialist
Member#: 1170
Join Date: Mar 2000
Chapter/Region:
BAIC
Location: San Jose, CA
Vehicle:2005 STi White |
![]() 90degrees??? i wnat to hear it.
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#9 |
Sooby Guru
Member#: 1914
Join Date: Jul 2000
Chapter/Region:
SWIC
Location: 2014 Q60S, 2016 Chevy SS
Vehicle:2000 2.5RS w/ EJ22T swap and N20. gone. : ( |
![]() As you wish.
http://www.importcars.net/subaru/rod.mpg Don't say I didn't warn you about how it sounds This is DannyAtWork's car. A fellow AZScooby member |
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#10 |
Scooby Specialist
Member#: 1170
Join Date: Mar 2000
Chapter/Region:
BAIC
Location: San Jose, CA
Vehicle:2005 STi White |
![]() oh yeah...poor danny. i remember hearing this when he posted his um...problems to put it lightly.... good lord that is ugly
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#11 |
Scooby Specialist
Member#: 3467
Join Date: Jan 2001
Location: Odenton, MD
Vehicle:1998 Dinan3 Bleck |
![]() Hey, my car made that sound before I snapped a rod in half and blew a hole in the top of my motor. The piston (#4) even seized into the cylinder.
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