991 GT3 Concerned Owners Group
#316
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#317
Race Director
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Update: Call scheduled tomorrow with PCNA to finalize dates, etc. I will update this thread after I speak with them.
#319
Race Director
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Update: Dates won't be known until sometime next week, due to some people being at Le Mans right now.
#320
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I think triggering these codes vary from one car to another. Mine triggered occasional Check Engine error that was not stored in PCM & cleared itself after an engine restart for almost 5K to 6K before it finally Happened. At around 18.5K miles the light stayed on permanently & error was store in PCM and Porsche ordered the inspection and the inspection revealed sever damage. I suspect if they ordered the inspection around 12K miles they would have observed light to medium wear. In my opinion triggering the Check engine error vary from one car to another and I believe it gets triggered after the damage is already pretty sever with perhaps occasional random check engine light showing up every once in a while but it goes away on its own. I have taken the car to Porsche service after every time light came on, and was told nothing was wrong, but they have replaced my coils & plugs on couple of occasions on PCNA recommendations. Just sharing my own experience.
The new G engine I got seems to run fine & very smooth, but it oil pressure is running higher than before and it feels it is putting out slightly less power than the E engine. It could be all in my head since I have not tracked the car since I the recent transplant, but this is how it feels on the street. Hope this helps. Mark
The new G engine I got seems to run fine & very smooth, but it oil pressure is running higher than before and it feels it is putting out slightly less power than the E engine. It could be all in my head since I have not tracked the car since I the recent transplant, but this is how it feels on the street. Hope this helps. Mark
#321
I think triggering these codes vary from one car to another. Mine triggered occasional Check Engine error that was not stored in PCM & cleared itself after an engine restart for almost 5K to 6K before it finally Happened. At around 18.5K miles the light stayed on permanently & error was store in PCM and Porsche ordered the inspection and the inspection revealed sever damage. I suspect if they ordered the inspection around 12K miles they would have observed light to medium wear. In my opinion triggering the Check engine error vary from one car to another and I believe it gets triggered after the damage is already pretty sever with perhaps occasional random check engine light showing up every once in a while but it goes away on its own. I have taken the car to Porsche service after every time light came on, and was told nothing was wrong, but they have replaced my coils & plugs on couple of occasions on PCNA recommendations. Just sharing my own experience.
The new G engine I got seems to run fine & very smooth, but it oil pressure is running higher than before and it feels it is putting out slightly less power than the E engine. It could be all in my head since I have not tracked the car since I the recent transplant, but this is how it feels on the street. Hope this helps. Mark
The new G engine I got seems to run fine & very smooth, but it oil pressure is running higher than before and it feels it is putting out slightly less power than the E engine. It could be all in my head since I have not tracked the car since I the recent transplant, but this is how it feels on the street. Hope this helps. Mark
I cannot believe that Porsche has not gotten to the bottom of the cause of these failures. This DLC coating seems in common use as an anti friction layer (I read about it in use on motorbikes). I am hoping that Porsche will be up front as to what exactly the issue is here. Then the question becomes whether the only fix is doing away with hydraulic lash adjusters as per the series 2. That is the crux of it.....
#323
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Porsche has identified the source of the issue, it's why the 991.2 GT3 has a solid lash adjuster design... Keeps a constant separation between the cam lobe and the finger follower to allow an oil film to form, same thing we're doing for the 991.1 with our solid lash adjuster upgrades.
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Dundon Motorsports
Gig Harbor, WA
253-200-4454
jamie@dundonmotorsports.com
www.dundonmotorsports.com
Facebook.com/dundonmotorsports
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#324
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Porsche has identified the source of the issue, it's why the 991.2 GT3 has a solid lash adjuster design... Keeps a constant separation between the cam lobe and the finger follower to allow an oil film to form, same thing we're doing for the 991.1 with our solid lash adjuster upgrades.
#325
Nordschleife Master
Porsche has identified the source of the issue, it's why the 991.2 GT3 has a solid lash adjuster design... Keeps a constant separation between the cam lobe and the finger follower to allow an oil film to form, same thing we're doing for the 991.1 with our solid lash adjuster upgrades.
#326
Three Wheelin'
I just stumbled into this. Not complex. Interesting insights....particularly on oil changes.
https://en.m.wikipedia.org/wiki/Hydraulic_tappet
https://en.m.wikipedia.org/wiki/Hydraulic_tappet
#327
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Don't want to derail Rob's thread, but parts are in production (finally) we made a few changes so that we can install parts and "stock" cams and not have to tune the car at all... Will also offer "tuner" cams that may require an ECU tune. Latest update from the manufacturer is middle to end of July for delivery, then we install and test.
#328
Burning Brakes
Porsche has identified the source of the issue, it's why the 991.2 GT3 has a solid lash adjuster design... Keeps a constant separation between the cam lobe and the finger follower to allow an oil film to form, same thing we're doing for the 991.1 with our solid lash adjuster upgrades.
#329
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Jamie, hope you are doing well! Just curious. I think I read somewhere that Porsche may be using a softer valve spring in later 9A1s. Do you know if this is the case? Would it make a difference? Do you have any thoughts on why the finger follower is occurring on a broad range of cars based on mileage/use? Some with the issue have been low miles no track, some have been high miles and/or heavily tracked, and some high mile track monsters have had no issue (OrthoJoe). Are there variables other than miles/type of use?
Since we're talking about lack of oil related wear, there are lots of things that could cause the issue, lots of starts and stops with cold oil, beating on the car when the oil is cold, tracking the car at high temps causing low oil viscosity, etc etc. These are all off the top of my head, I'm sure there are more. But the bottom line is, fix the issue at the source (keep oil between the cam lobe and finger follower) and all the other possible use correlations are no longer concerns.
#330
Three Wheelin'
What is the reason Porsche just didn't go with solid lash adjusters in the first place back in 2013? Is it more expensive or is there some other drawback?