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997.2 3.8 Engine Failure

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Old 05-26-2019, 09:12 PM
  #856  
PhillyNate
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Originally Posted by Petza914
How do you have a 9A1 motor that isn't DFI?
I have a 987.2 base Cayman. 9A1 but no DFI.
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Old 05-26-2019, 09:17 PM
  #857  
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Originally Posted by Balr14
The only documented cases of bore scoring have been the result of cold seizure. The leading causes of cold seizure appear to be block fatigue or poor warm up practices.
Thank you for your response but I thought I saw Jake or someone say through these VOLUMINOUS posts that he recommends a more “robust” and/or well rounded oil such as the DT-40 due to the 9A1’s being direct injected?
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Old 05-27-2019, 12:09 AM
  #858  
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Originally Posted by PhillyNate
Thank you for your response but I thought I saw Jake or someone say through these VOLUMINOUS posts that he recommends a more “robust” and/or well rounded oil such as the DT-40 due to the 9A1’s being direct injected?
Actually, it would be Driven DI40 for the 9A1 platform and DT40 for the M96/M97 port injection.
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Old 05-27-2019, 01:03 AM
  #859  
Balr14
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Originally Posted by PhillyNate
Thank you for your response but I thought I saw Jake or someone say through these VOLUMINOUS posts that he recommends a more “robust” and/or well rounded oil such as the DT-40 due to the 9A1’s being direct injected?
Anything that provides a better lubricating layer between the piston and cylinder is felt to be beneficial. DFI may contribute to breaking down that protection. But, there is no definitive cause of cold seizure that I have read.
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Old 05-27-2019, 01:46 AM
  #860  
sandwedge
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Originally Posted by Petza914
How do you have a 9A1 motor that isn't DFI?

That's what I was asking myself too. I thought the new engine with DFI is what gave it the 9A1 designation. If no DFI then it would seem to me it's not a 9A1 engine.
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Old 05-27-2019, 06:56 AM
  #861  
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Balr14 did you miss all the posts explaining that measuring the actual bores of seized engines revealed that they had closed ion at the bottom of the cylinder so there was almost no cold clearance?

Baz
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Old 05-27-2019, 09:41 AM
  #862  
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Originally Posted by sandwedge
That's what I was asking myself too. I thought the new engine with DFI is what gave it the 9A1 designation. If no DFI then it would seem to me it's not a 9A1 engine.
The new engine used in the base Boxster and base Cayman for 2009 had port injection. I remember when the new engine arrived, Porsche stated that they met their design goals for those models without needing to go to DI.
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Old 05-27-2019, 11:09 AM
  #863  
MexicoBlueTurboS
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Originally Posted by Petza914
How much for the case of DT40?
Only joking - by the time I ship it - it's a lose lose for both of us. I'll probably use it and then make the switch to DI or use in another car.

Thanks for the Techron answer.
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Old 05-27-2019, 01:01 PM
  #864  
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Originally Posted by bazhart
Balr14 did you miss all the posts explaining that measuring the actual bores of seized engines revealed that they had closed ion at the bottom of the cylinder so there was almost no cold clearance?

Baz
Perhaps my wording is incorrect, but that is exactly what I was trying to convey, which has no connection to DFI that I have seen. The discussion seems to have turned to whether or not different oil or oil additives are any benefit. I do not see how that would help, but I don't think it will hurt.
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Old 05-27-2019, 01:12 PM
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Originally Posted by NuttyProfessor
Actually, it would be Driven DI40 for the 9A1 platform and DT40 for the M96/M97 port injection.
My error and apology. Not familiar with Joe Gibbs oil. I use Motul
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Old 05-27-2019, 01:16 PM
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Originally Posted by Fahrer
The new engine used in the base Boxster and base Cayman for 2009 had port injection. I remember when the new engine arrived, Porsche stated that they met their design goals for those models without needing to go to DI.
EXACTLY right.
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Old 05-27-2019, 03:13 PM
  #867  
Big Swole
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I need clarification here. 9A1 - DI, Correct?
I'm not so sure about a NON DI 9A1 engine.
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Old 05-27-2019, 04:29 PM
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Originally Posted by Big Swole
I need clarification here. 9A1 - DI, Correct?
I'm not so sure about a NON DI 9A1 engine.
For Carreras, yes.
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Old 05-27-2019, 04:35 PM
  #869  
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Originally Posted by Fahrer
For Carreras, yes.
Ah okay..

Still not sure why they'd use the same engine designation for another car that wasn't at the same as Carreras.
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Old 05-27-2019, 04:53 PM
  #870  
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Originally Posted by MexicoBlueTurboS
I've learned a lot in this thread - thanks to all - especially, Jake, Charles, Baz and Pete.

First.. Anyone want to buy an unopened case of DT40 ? LOL

Secondly - Pete do you go to the trouble to pull your oil sample before the Techron? Going with the assumption that if it affects the oil it affects oil analysis.

Lastly - is it overkill to change to DI40 and also use Cera Tec ? (This is for a Turbo S)
Driven oils already have MoDTC (moly), so no need for Ceratec. DI40 already has 300ppm which is what the recommended blend rate nets you using Ceratec with a common A40 oil.
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