what couses big end failure ?
03 January 2011, 07:33 PM
#1
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what couses big end failure ?
Hi !
Here in Sweden some of us got big end failure.
And with some googling I could see that you have the same problem in Uk.
So what couses this problems ?
Canīt see that the engines knocked or something before the failure.
Talked with some tuningcompany here about the knocks but they say that itīs not the knockings that kills the bearings..well it may couse it if it knocks for veeeeeeeeeeery very loong time but a piston would fail first he sayed.
Between is it just v3-v4 wich have these problems ?
or even v5-v6?
Here we have even seen wrx(called GT) with big end failure.
Sorry for bad english ! hope U understand me anyway.
And we run 98ron or v-power(99ron) here.
Here in Sweden some of us got big end failure.
And with some googling I could see that you have the same problem in Uk.
So what couses this problems ?
Canīt see that the engines knocked or something before the failure.
Talked with some tuningcompany here about the knocks but they say that itīs not the knockings that kills the bearings..well it may couse it if it knocks for veeeeeeeeeeery very loong time but a piston would fail first he sayed.
Between is it just v3-v4 wich have these problems ?
or even v5-v6?
Here we have even seen wrx(called GT) with big end failure.
Sorry for bad english ! hope U understand me anyway.
And we run 98ron or v-power(99ron) here.
03 January 2011, 09:16 PM
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okey ! thats why it is so many cosworth oilpumps for sale....
By the way.. Does anybody knows anything about BH Automotives in Doncastor ?
They have rebuilt a v5 engine after big end failure wich Im planing to buy ev....
By the way.. Does anybody knows anything about BH Automotives in Doncastor ?
They have rebuilt a v5 engine after big end failure wich Im planing to buy ev....
03 January 2011, 09:40 PM
#7
Mild detting over a period of time will weaken the big end/s. They can then typically give up the ghost after a service, if the 'correct oil change procedure' isn't followed.
Sometimes, when people replace a failed head gasket in a mid-high miles car, the restored C.R. can also cause them to fail soon after. That's why, in such a scenario, a lot of specialists seriously advise on having a bottom-end refresh at the same time...
Sometimes, when people replace a failed head gasket in a mid-high miles car, the restored C.R. can also cause them to fail soon after. That's why, in such a scenario, a lot of specialists seriously advise on having a bottom-end refresh at the same time...
Last edited by joz8968; 03 January 2011 at 09:43 PM.
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03 January 2011, 09:42 PM
#8
Mild detting over a period of time will weaken the big end/s. They can then typically give up the ghost if the 'correct oil change procedure' isn't followed.
Sometimes, when people replace a failed head gasket in a mid-high miles car, the restored C.R. can also cause them to fail soon after. That's why, in such a scenario, a lot of specialists seriously advise on having a bottom-end refresh at the same time...
Sometimes, when people replace a failed head gasket in a mid-high miles car, the restored C.R. can also cause them to fail soon after. That's why, in such a scenario, a lot of specialists seriously advise on having a bottom-end refresh at the same time...
03 January 2011, 09:57 PM
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yes,well very offen itīs private people wich rebuilt them .
Funny thing.. checked some on pistonheads(yes again) and more then half of them have the enginerebuilt :S
Have BH Automotives any good reputation in UK ?
Funny thing.. checked some on pistonheads(yes again) and more then half of them have the enginerebuilt :S
Have BH Automotives any good reputation in UK ?
03 January 2011, 10:12 PM
#14
I'm not saying some privateers don't know what they're doing, etc.
Just that how is a potential buyer supposed to know whether it's gonna be okay?! Therein lies the rub.
At least if the motor's been rebuilt by the likes of API, RCM, Zen (when they did garage work), etc, etc., then you're seriously reducing the odds ending up with a dodgy motor, due to the 'knowns' of the expertise involved...
Just that how is a potential buyer supposed to know whether it's gonna be okay?! Therein lies the rub.
At least if the motor's been rebuilt by the likes of API, RCM, Zen (when they did garage work), etc, etc., then you're seriously reducing the odds ending up with a dodgy motor, due to the 'knowns' of the expertise involved...
Last edited by joz8968; 03 January 2011 at 10:14 PM.
03 January 2011, 10:20 PM
#15
Mild detting over a period of time will weaken the big end/s. They can then typically give up the ghost after a service, if the 'correct oil change procedure' isn't followed.
Sometimes, when people replace a failed head gasket in a mid-high miles car, the restored C.R. can also cause them to fail soon after. That's why, in such a scenario, a lot of specialists seriously advise on having a bottom-end refresh at the same time...
Sometimes, when people replace a failed head gasket in a mid-high miles car, the restored C.R. can also cause them to fail soon after. That's why, in such a scenario, a lot of specialists seriously advise on having a bottom-end refresh at the same time...
What happened to mine, aided by a bit, (a lot), of heatsoak.
04 January 2011, 08:54 AM
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if the rebuild has covered a few thousand miles i wouldnt be too bothered but a fresh one i would be a bit worried, they usually break quickly if not done right
04 January 2011, 01:04 PM
#20
Outside temperatures of 40+ degrees, been giving it plenty on the motorway for an hour before, TMIC, running around 300bhp, got to a toll booth, queued briefly as I have a remote, and booted it away, within a mile the KL lit up like a Christmas tree, and oil pressure and oil temperature were going in different directions with the Defi alarms all going off
Warnings all too late, damage done
04 January 2011, 02:00 PM
#22
That was it mate.
Outside temperatures of 40+ degrees, been giving it plenty on the motorway for an hour before, TMIC, running around 300bhp, got to a toll booth, queued briefly as I have a remote, and booted it away, within a mile the KL lit up like a Christmas tree, and oil pressure and oil temperature were going in different directions with the Defi alarms all going off
Warnings all too late, damage done
Outside temperatures of 40+ degrees, been giving it plenty on the motorway for an hour before, TMIC, running around 300bhp, got to a toll booth, queued briefly as I have a remote, and booted it away, within a mile the KL lit up like a Christmas tree, and oil pressure and oil temperature were going in different directions with the Defi alarms all going off
Warnings all too late, damage done
Or were you philosophical about the whole thing?
Last edited by joz8968; 05 January 2011 at 04:58 PM.
05 January 2011, 04:03 PM
#23
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That was it mate.
Outside temperatures of 40+ degrees, been giving it plenty on the motorway for an hour before, TMIC, running around 300bhp, got to a toll booth, queued briefly as I have a remote, and booted it away, within a mile the KL lit up like a Christmas tree, and oil pressure and oil temperature were going in different directions with the Defi alarms all going off
Warnings all too late, damage done
Outside temperatures of 40+ degrees, been giving it plenty on the motorway for an hour before, TMIC, running around 300bhp, got to a toll booth, queued briefly as I have a remote, and booted it away, within a mile the KL lit up like a Christmas tree, and oil pressure and oil temperature were going in different directions with the Defi alarms all going off
Warnings all too late, damage done
Plus good fuel to keep it up there for octane helps - but cannot overcome the top mount problems.
Never heard of BH in Doncaster.
David APi
Our new rolling road is ready to roll.
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05 January 2011, 04:42 PM
#24
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Maf's are also known to cause a problem! A damaged/dirty maf can cause the engine to run lean. This in turn makes the car work alot harder which equals running hotter & bang!!
05 January 2011, 06:38 PM
#25
Agree with the heatsoak theory,i have a primative temp probe in the rubber pipe from TMIC to throttle body, i know its not perfect nor 100% accurate,but its an aide nontheless.
driving along,temp read 29 on a summers day,parked up for 5 mins,engine off, on my way again and the reading was 64 !
it took 1 mile toget the reading back down to the 20`s
driving along,temp read 29 on a summers day,parked up for 5 mins,engine off, on my way again and the reading was 64 !
it took 1 mile toget the reading back down to the 20`s
05 January 2011, 06:58 PM
#26
That was it then : Heatsoak causing det = which lunched it. The most dangerous 1/2 mile you will ever drive in a Subaru is the one straight after long traffic delays or long traffic light waits. On a front mount no sweat, on a top mount, especially the dinky little ones on early cars- KABOOM.
Plus good fuel to keep it up there for octane helps - but cannot overcome the top mount problems.
Never heard of BH in Doncaster.
David APi
Our new rolling road is ready to roll.
Agents for:
Simtek, the most exciting new Ecu for years
Buddy Club exhausts
Hayward & Scott exhausts
Carbonetics clutches
BC suspension
Samco hose kits
Hybrid front mount intercooler kits
AP Racing brakes and clutches
Performance friction products
And of course; the well known APi Performance Exedy organic clutch
www.apiengines.com
www.apiimpreza.com
01926 614333
Plus good fuel to keep it up there for octane helps - but cannot overcome the top mount problems.
Never heard of BH in Doncaster.
David APi
Our new rolling road is ready to roll.
Agents for:
Simtek, the most exciting new Ecu for years
Buddy Club exhausts
Hayward & Scott exhausts
Carbonetics clutches
BC suspension
Samco hose kits
Hybrid front mount intercooler kits
AP Racing brakes and clutches
Performance friction products
And of course; the well known APi Performance Exedy organic clutch
www.apiengines.com
www.apiimpreza.com
01926 614333
05 January 2011, 07:03 PM
#27
However, once I'd decided to rebuild.........
I was shown a LOT of kindness on here by a LOT of people, when it happened, particularly three who were brilliant.
05 January 2011, 07:06 PM
#28
That was it then : Heatsoak causing det = which lunched it. The most dangerous 1/2 mile you will ever drive in a Subaru is the one straight after long traffic delays or long traffic light waits. On a front mount no sweat, on a top mount, especially the dinky little ones on early cars- KABOOM.
Plus good fuel to keep it up there for octane helps - but cannot overcome the top mount problems.
Never heard of BH in Doncaster.
David APi
Our new rolling road is ready to roll.
Agents for:
Simtek, the most exciting new Ecu for years
Buddy Club exhausts
Hayward & Scott exhausts
Carbonetics clutches
BC suspension
Samco hose kits
Hybrid front mount intercooler kits
AP Racing brakes and clutches
Performance friction products
And of course; the well known APi Performance Exedy organic clutch
www.apiengines.com
www.apiimpreza.com
01926 614333
Plus good fuel to keep it up there for octane helps - but cannot overcome the top mount problems.
Never heard of BH in Doncaster.
David APi
Our new rolling road is ready to roll.
Agents for:
Simtek, the most exciting new Ecu for years
Buddy Club exhausts
Hayward & Scott exhausts
Carbonetics clutches
BC suspension
Samco hose kits
Hybrid front mount intercooler kits
AP Racing brakes and clutches
Performance friction products
And of course; the well known APi Performance Exedy organic clutch
www.apiengines.com
www.apiimpreza.com
01926 614333
We live and learn. It costs some of us good money to do so.
Others, hopefully, benefit from our experiences.
06 January 2011, 10:33 AM
#29
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NEVER take a Scoob to Europe without AA cover, it is a problem waiting to bite you on the bum. Especially if you are doing long motorway distances in hot weather.
David
David
Now, that doesn't exactly fill one with confidence, does it!