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Just had a PPI done including borescoping, and was told there was some wearing in the cylinders but nothing unusual. Just wanted to get a quick check before I go ahead with my purchase. Looks like scoring to me?
Last edited by westcoastj; 05-14-2021 at 08:46 PM.
That looks more to me like “streaking” which is indeed considered normal cylinder wear. More particulars on the car would be helpful. How many miles on the car? How does the car sound at idle? Did all of the cylinders display that wear? What did the plugs looks like?
If you are still concerned, having the cylinders checked from the backside through the oil sump would be the recommended course of action as bore scoring tends to originate at BDC where it is not visible through the spark plug holes.
It's a 2016 991.1 C4 manual transmission with about 38k km. Unfortunately, the car is located out of province so I have not seen the car in person, buying sight unseen but PPI was done by a dealership. Those pictures are from all 6 different cylinders. TRA/RKAT B1 -0.4mg/stroke and -0.25mg/stroke if that means anything. I asked an independent mechanic who seems to think it was early signs of borescoring. I've decided to walk away from the deal and purchase a new C2S instead for peace of mind.
It's a 2016 991.1 C4 manual transmission with about 38k km. Unfortunately, the car is located out of province so I have not seen the car in person, buying sight unseen but PPI was done by a dealership. Those pictures are from all 6 different cylinders. TRA/RKAT B1 -0.4mg/stroke and -0.25mg/stroke if that means anything. I asked an independent mechanic who seems to think it was early signs of borescoring. I've decided to walk away from the deal and purchase a new C2S instead for peace of mind.
Good thing you passed on this— I had a similar boroscope when I got my .1 GTS and after a month and a half ended up with horrible bore scoring and required a new engine which was a very stress inducing experience.
Good thing you passed on this— I had a similar boroscope when I got my .1 GTS and after a month and a half ended up with horrible bore scoring and required a new engine which was a very stress inducing experience.
Thanks for this feedback.
I have not read particular reliability issues with the 9A1 engine on 997.2 or 991.1 except a chap (on RL if my memory serves me well) who saw that bore scoring also happened on 9A1 engine - my understanding is that these cases are exceptional and I think (if I am not mistaken) that he mentioned key factors such as driving cycle (i.e. not warming properly the engine) and repetition of this (bad) driving cycle.
At the end of the day, this would definitely not prevent me from buying a 991.1 but just something to add in the PPI to have a peace of mind.
I have not read particular reliability issues with the 9A1 engine on 997.2 or 991.1 except a chap (on RL if my memory serves me well) who saw that bore scoring also happened on 9A1 engine - my understanding is that these cases are exceptional and I think (if I am not mistaken) that he mentioned key factors such as driving cycle (i.e. not warming properly the engine) and repetition of this (bad) driving cycle.
At the end of the day, this would definitely not prevent me from buying a 991.1 but just something to add in the PPI to have a peace of mind.
definitely wouldn’t rule out 991.1’s because of this. And agreed that boroscope should be done with PPI on these cars too.
FWIW given the rarity of the issue the only two others I know that also had bore scoring on a 991.2 NA1 engine had their engines replaced by PCNA even outside CPO. My guess is it’s cheaper for them to do this than risk the liability of admitting to it publicly (for the small number of cases like this).
05-14-2021, 07:51 PM
URGENT!!! Do these cylinders look normal to you?
