991.1 GT3 Latest Motor Updates
05-21-2019, 05:36 PM
#46
Race Car
Originally Posted by DK7
Trakcar or Kobalt tracked 991.1 RS a lot without engine issues to my knowledge so far.
There are some .1RS here at the Ring that have a lot of miles on them. I'll check with them if they have had any issues.
05-21-2019, 05:57 PM
#47
One of my race shop techs went to work at Porsche
Over a few beverages he told me all 991.1 gt3 engines (including RS and R) have this problem and steer clear..and he knows his stuff
They cut the oil filter on every one that comes in, each one is a little worse each time
We used to coat the rod bearings in race motors with the same stuff. It lengthens the part life but it will eventually fail. Just a band aid
Porsche warranties the gt3 because they were forced to
Enjoy the car while under warranty..then punt it
I wouldn't own any 991.1 gt3 variant out of warranty..even RS or R
Local race shop had a guy buy a bubble wrapped .1rs a few months back..it Thru a rod at 900 miles on track. Porsche is being a ***** about warranty engine since it was not broke in to spec
Over a few beverages he told me all 991.1 gt3 engines (including RS and R) have this problem and steer clear..and he knows his stuff
They cut the oil filter on every one that comes in, each one is a little worse each time
We used to coat the rod bearings in race motors with the same stuff. It lengthens the part life but it will eventually fail. Just a band aid
Porsche warranties the gt3 because they were forced to
Enjoy the car while under warranty..then punt it
I wouldn't own any 991.1 gt3 variant out of warranty..even RS or R
Local race shop had a guy buy a bubble wrapped .1rs a few months back..it Thru a rod at 900 miles on track. Porsche is being a ***** about warranty engine since it was not broke in to spec
05-21-2019, 06:10 PM
#48
Instructor
One of my race shop techs went to work at Porsche
Over a few beverages he told me all 991.1 gt3 engines (including RS and R) have this problem and steer clear..and he knows his stuff
They cut the oil filter on every one that comes in, each one is a little worse each time
We used to coat the rod bearings in race motors with the same stuff. It lengthens the part life but it will eventually fail. Just a band aid
Porsche warranties the gt3 because they were forced to
Enjoy the car while under warranty..then punt it
I wouldn't own any 991.1 gt3 variant out of warranty..even RS or R
Local race shop had a guy buy a bubble wrapped .1rs a few months back..it Thru a rod at 900 miles on track. Porsche is being a ***** about warranty engine since it was not broke in to spec
Over a few beverages he told me all 991.1 gt3 engines (including RS and R) have this problem and steer clear..and he knows his stuff
They cut the oil filter on every one that comes in, each one is a little worse each time
We used to coat the rod bearings in race motors with the same stuff. It lengthens the part life but it will eventually fail. Just a band aid
Porsche warranties the gt3 because they were forced to
Enjoy the car while under warranty..then punt it
I wouldn't own any 991.1 gt3 variant out of warranty..even RS or R
Local race shop had a guy buy a bubble wrapped .1rs a few months back..it Thru a rod at 900 miles on track. Porsche is being a ***** about warranty engine since it was not broke in to spec
05-21-2019, 09:04 PM
#50
Rennlist Member
OP, sorry to hear of your engine troubles. Still no known failures of the Revision 2 G motor that I am aware of, as Rob said. So 4th times the charm hopefully.
Curious as to what oil you're running? Is it Mobil 1 ? Mobil 1 IMO is significantly exacerbating the FF issue. Motul 8100 XCESS or the like are far superior from a wear protection film/barrier perspective. Mobil 1 use to be a good group IV oil, until Exxon bought them out in the early 2000's and switched to a different base stock (not true synthetic). I have also heard of quality control issues with Mobil 1, and cheating on the ingredients. There is a reason Wal-Mart sells it for ~$3.99 a quart. Also, North American "European Blend" is significantly different (inferior) to the Mobil 1 sold in Europe, as it uses an entirely different formula (better base stock).
If you are using Mobil 1, I would switch to Motul 8100 XCESS 5W-40 or something equivalent. I use to burn ~1 quart every 1500 miles with Mobil 1, I now burn 0. Not a drop with Motul 8100 XCESS 5W-40.
Curious as to what oil you're running? Is it Mobil 1 ? Mobil 1 IMO is significantly exacerbating the FF issue. Motul 8100 XCESS or the like are far superior from a wear protection film/barrier perspective. Mobil 1 use to be a good group IV oil, until Exxon bought them out in the early 2000's and switched to a different base stock (not true synthetic). I have also heard of quality control issues with Mobil 1, and cheating on the ingredients. There is a reason Wal-Mart sells it for ~$3.99 a quart. Also, North American "European Blend" is significantly different (inferior) to the Mobil 1 sold in Europe, as it uses an entirely different formula (better base stock).
If you are using Mobil 1, I would switch to Motul 8100 XCESS 5W-40 or something equivalent. I use to burn ~1 quart every 1500 miles with Mobil 1, I now burn 0. Not a drop with Motul 8100 XCESS 5W-40.
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slipaway37 (03-07-2023)
05-21-2019, 09:15 PM
#52
Rennlist Member
I truly believe Porsche is underestimating the poor quality of North American Mobil 1 vs their superior European Mobil 1. I also believe this is why the FF issue didn't surface sooner in the development cycle. Yes, there is a somewhat intrinsic issue in the hydraulic lifter design vs. solid lifter, from an excessive inertia standpoint. Albeit, Porsche is testing/developing their engines with superior oil.
In short, friends don't let friends buy Bose or Mobil 1.
In short, friends don't let friends buy Bose or Mobil 1.
05-21-2019, 10:52 PM
#53
Instructor
So do we have any documented G6 motor failures yet?
My car was replaced in Sep. 2018 with G608xx and seems solid after about 4k miles. Just did the first oil change and it looked good, but now this thread has me worried, especially since I just used Mobil 1 lol
My car was replaced in Sep. 2018 with G608xx and seems solid after about 4k miles. Just did the first oil change and it looked good, but now this thread has me worried, especially since I just used Mobil 1 lol
05-22-2019, 09:59 AM
#55
Race Director
That engine should have all the fixes so you should be good. As the guys mentioned, maybe use a better approved oil. That is my plan if/when my original engine goes. Until then....M1.
05-22-2019, 10:17 AM
#56
05-22-2019, 11:44 AM
#57
My 991.1 RS is Nov 2016 built with G0739x , I believe is one of the very last .1 RS built (RHD) factory G engine
I’m not aware about G6 motor, or exist.
another old thread
https://rennlist.com/forums/991-gt3-...ne-number.html
I’m not aware about G6 motor, or exist.
another old thread
https://rennlist.com/forums/991-gt3-...ne-number.html
05-22-2019, 12:57 PM
#58
Rennlist Member
Rob, I believe why you're not seeing the FF issue with your motor is due to living at altitude. The volumetric efficiency is lower due to lower atmospheric pressure/o2, resulting in lower heat/friction/stresses inside the engine.
05-22-2019, 01:19 PM
#59
Race Director
You are probably right. I need to take this car to sea level for a week!
