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I'm wondering if bore scoring is 100% unique to pre 2009 engines. Are there any reports of this after? I'm specifically looking at post 2009 just to save the headache.
I'm wondering if bore scoring is 100% unique to pre 2009 engines. Are there any reports of this after? I'm specifically looking at post 2009 just to save the headache.
The answer is NO--->Post 2008 997.2 engine's are also subject to Bore Scoring.
Just search here or internet and you weill find lots of 997.s Bore Scoring stories.
...And the 997.1 "S" 3.8L engine seems to be the most prone to scoring.
Last edited by groovzilla; Aug 10, 2023 at 03:00 PM.
The answer is NO--->Post 2008 997.2 engine's are also subject to Bore Scoring.
Just search here or internet and you weill find lots of 997.s Bore Scoring stories.
...And the 997.1 "S" 3.8L engine seems to be the most prone to scoring.
Exactly. 2009 and newer 997.2's are starting to pop up with bore scoring.
Truth be told, these are 15 year old performance cars, and any 15 year old vehicle is prone to some sort of wear and tear. I've posted this statement a number of times, I see bore scoring as wear and tear. Just go into every purchase with your eyes open. Get a PPI with a bore scope, or don't and budget $20k for a rebuild.
MA1 Engines will score (997.2 and 991.1) Both local 991.1 engines I have personally scoped for friends have light scoring/scuffing. No excessive oil use/engine noise and both cars are happily on the road.
Originally Posted by Bomba
Truth be told, these are 15 year old performance cars, and any 15 year old vehicle is prone to some sort of wear and tear. I've posted this statement a number of times, I see bore scoring as wear and tear.
Couldn't agree more. It can be mitigated with fuel dilution management (Run good PEA rich fuel injector cleaner/fuel injector replacement if need be) and proper high moly oil and/or additives.
Last edited by Graufuchs; Aug 10, 2023 at 03:52 PM.
The answer is NO--->Post 2008 997.2 engine's are also subject to Bore Scoring.
Just search here or internet and you weill find lots of 997.s Bore Scoring stories.
...And the 997.1 "S" 3.8L engine seems to be the most prone to scoring.
Originally Posted by Graufuchs
MA1 Engines will score (997.2 and 991.1) Both local 991.1 engines I have personally scoped for friends have light scoring/scuffing. No excessive oil use/engine noise and both cars are happily on the road.
Couldn't agree more. It can be mitigated with fuel dilution management (Run good PEA rich fuel injector cleaner/fuel injector replacement if need be) and proper high moly oil and/or additives.
Side note - I'm convinced that my Driven Fuel Injector cleaner with PEA caused my fuel purge valve to clog and fail. I'm not planning on running any PEA injector cleaners for at least 6 months. Both my and my Porsche indy's theory is that the PEA dislodged something in the tank or fuel lines that got clogged in the purge valve. I spent 2 months chasing idle problems until the car mercifully threw a CEL that pointed to the purge valve.
Side note - I'm convinced that my Driven Fuel Injector cleaner with PEA caused my fuel purge valve to clog and fail. I'm not planning on running any PEA injector cleaners for at least 6 months. Both my and my Porsche indy's theory is that the PEA dislodged something in the tank or fuel lines that got clogged in the purge valve. I spent 2 months chasing idle problems until the car mercifully threw a CEL that pointed to the purge valve.
Thanks for that...will definitely keep that in Mind. I generally run a bottle every 3K (went LM this time around).
I own a formally scored 997.2. Also can add that I'm pretty sure the STP fuel injector cleaner w PEA that I used post rebuild resulted in a failing injector getting so bad it finally caused and threw a misfire code. Ended up replacing all 6 injectors.
Once tracked down the 997.2 bore scores seem to be most likely cold seizure that begins near the bottom of the cylinder. Baz at Harwood in the UK seems to be the expert on this. He feels this is a casting problem that will show in the first 50K miles of it is going to show at all. It is a rare event.
Yes, bore scoring can occur on any car. A flat design stresses the cylinder walls to allow bore score more easily. But there are many 9A1 motors out there now that are beyond 150K miles that have no indications. If you're worrying about 9A1 bore score beyond other things you are living a blessed life!!!
and yes, the only real way to scope is pull off the pan and go from the underside where it’s likely to start.. it’s only silicone that holds it on and if you spot new silicone you know someone has already been in there and you’ve caught them red handed…
but before all that you’ll blow through oil, have a sooty back bumper and starting to get misfires.
Agree^
and yes, the only real way to scope is pull off the pan and go from the underside where it’s likely to start.. it’s only silicone that holds it on and if you spot new silicone you know someone has already been in there and you’ve caught them red handed…
but before all that you’ll blow through oil, have a sooty back bumper and starting to get misfires.
again, a rare event… especially with the 3.6’s
I would have to again disagree---> Any Scored cylinder will show it's ugly head in a spark plug scope. After 30-40K miles, 99% of scored cylinders are scored at least 70% from the bottom and most 90%.
Just search Threads and Internet and you will see it for yourself.
So save $1200 and probability seller won't let you scope by removing oil pan(because it is invasive) and scope 997 engine from the spark plug holes doe $250.
I would have to again disagree---> Any Scored cylinder will show it's ugly head in a spark plug scope. After 30-40K miles, 99% of scored cylinders are scored at least 70% from the bottom and most 90%.
Just search Threads and Internet and you will see it for yourself.
So save $1200 and probability seller won't let you scope by removing oil pan(because it is invasive) and scope 997 engine from the spark plug holes doe $250.
spark plug hole before bottom of the cylinder wall? You couldn’t be anymore incorrect… I’ve known people that checked the spark plug hole first and there was no scoring… pull the pan off and there it was… scoring will happen from the bottom first….
spark plug hole before bottom of the cylinder wall? You couldn’t be anymore incorrect… I’ve known people that checked the spark plug hole first and there was no scoring… pull the pan off and there it was… scoring will happen from the bottom first….
This!!!
But nobody in their right mind is going to let you pull the pan. And in the case of the 9A1 you have to pull the scavenger pump and piping and more to see anything. Again, the 9A1 suffered cold seizure in a very few cases. Bore score suspicions that I've seen have led to cold seizure analysis. That's an early life failure. Warm the motor up quickly but gently. Change the oil every 4 to 5K miles. And enjoy the drive 😀
As always, a knowledgeable seller with service records is nice.
Edit ... Don't mean to ruffle feathers here. The bore score fear is real but the 9A1 is a significantly different beast that was (over) designed once Porsche had some cash reserves. Comparisons to older cars generally do not work well.
Last edited by Wayne Smith; Aug 10, 2023 at 06:39 PM.
The 5 Bore Scope Inspections I have had performed on 997S cars with 70-90K miles, all had scoring 90-100% of the way up the cylinder wall.
I'll stick to my Spark Plug Hole method for $250.
From Da top:
2 of the engines I had BSI - From Da Top
Last edited by groovzilla; Aug 10, 2023 at 06:50 PM.
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Bore Scoring after 2008
