Evo 8/9 Engine Failures
#1
Evo 8/9 Engine Failures
I'm planning for engine upgrade now, so when it's time, I know exactly what to do so my Evo isn't sitting for years.
I didn't find any threads that groups engine failures for the Evo 8/9 engines (I did see the Evo 10 thread). For engines that failed, I just want to know how many miles on engine; if not original, add description of the rebuild; what failed; and best estimate as to the cause. If it was a bad tune, leave tuner out because we don't need to get off topic. Although the bad tune can cause a failure, it exposed the weakest part of the engine.
I didn't find any threads that groups engine failures for the Evo 8/9 engines (I did see the Evo 10 thread). For engines that failed, I just want to know how many miles on engine; if not original, add description of the rebuild; what failed; and best estimate as to the cause. If it was a bad tune, leave tuner out because we don't need to get off topic. Although the bad tune can cause a failure, it exposed the weakest part of the engine.
#2
Here's the first:
1320awd / original Evo 9 engine at 20k miles / cylinders #2 & #4 / running closed loop at WOT
https://www.evolutionm.net/forums/ev...ideas-why.html
1320awd / original Evo 9 engine at 20k miles / cylinders #2 & #4 / running closed loop at WOT
https://www.evolutionm.net/forums/ev...ideas-why.html
#3
These sound like they just need headwork:
mikenjulie / original E8 engine with 44k miles / cylinder #4 /
kelford 272 cams?
42revoincali / original E8 engine with 44k miles / cylinder #4 /
kelford 272 cams?
https://www.evolutionm.net/forums/ev...own-motor.html
mikenjulie / original E8 engine with 44k miles / cylinder #4 /
kelford 272 cams?
42revoincali / original E8 engine with 44k miles / cylinder #4 /
kelford 272 cams?
https://www.evolutionm.net/forums/ev...own-motor.html
#5
EvoM Community Team Leader
iTrader: (60)
Stock motor developed bad rings at 130k so had low compression in cyl 3. Who knows how the original owner took care of the car.
built motor developed knock at about 1000 miles. The oil pump balance shaft bolt backed out. Cause lots of metal to go everywhere.
OEM rebuild died after about 2,000 miles. Theory is that I got a thrust bearing that was sized wrong. The one clearance I wasn't able to measure.
Bought an OEM shortblock. Not messing with builds for a while, and I'd really like to see another 100k+ before needing to mess with it, again.
built motor developed knock at about 1000 miles. The oil pump balance shaft bolt backed out. Cause lots of metal to go everywhere.
OEM rebuild died after about 2,000 miles. Theory is that I got a thrust bearing that was sized wrong. The one clearance I wasn't able to measure.
Bought an OEM shortblock. Not messing with builds for a while, and I'd really like to see another 100k+ before needing to mess with it, again.
#6
This site has been great to give me insights on how to modify my car. It just takes a lot of search time.
#7
Yikes! Sounds like a big expensive headache!
I am a DIYer and like the challenge. But don't like the idea of down time. If I can find some room for engine project, I may find a cheap blown engine and try building it.
I am a DIYer and like the challenge. But don't like the idea of down time. If I can find some room for engine project, I may find a cheap blown engine and try building it.
Stock motor developed bad rings at 130k so had low compression in cyl 3. Who knows how the original owner took care of the car.
built motor developed knock at about 1000 miles. The oil pump balance shaft bolt backed out. Cause lots of metal to go everywhere.
OEM rebuild died after about 2,000 miles. Theory is that I got a thrust bearing that was sized wrong. The one clearance I wasn't able to measure.
Bought an OEM shortblock. Not messing with builds for a while, and I'd really like to see another 100k+ before needing to mess with it, again.
built motor developed knock at about 1000 miles. The oil pump balance shaft bolt backed out. Cause lots of metal to go everywhere.
OEM rebuild died after about 2,000 miles. Theory is that I got a thrust bearing that was sized wrong. The one clearance I wasn't able to measure.
Bought an OEM shortblock. Not messing with builds for a while, and I'd really like to see another 100k+ before needing to mess with it, again.
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#10
Evolved Member
Here we get used evo 7-8 short blocks almost 100k + kms.
They fail after 10-15k of street and drag kms.
What failed? Broken rods. Worn rings and pistons. Not a single case of spun bearing.
#13
Evolved Member
iTrader: (21)
just buy a built motor from a shop who's done all this research already. you can't compare a stock motor failure to a stock motor failure with a huge turbo and expect to get anything of importance out of it. you can't compare a stock motor to a built motor. you can't compare a built motor from english to a built motor from ams or buschur because they all build them differently.
if you really want something that will last, keep the stock turbo, don't over-work it, and dont hammer on it all the time. or buy a built motor with tight tolerances (not super high power...) from a reputable engine builder.
you're trying to compare apples to oranges to a giraffe
if you really want something that will last, keep the stock turbo, don't over-work it, and dont hammer on it all the time. or buy a built motor with tight tolerances (not super high power...) from a reputable engine builder.
you're trying to compare apples to oranges to a giraffe