View Poll Results: Have you had engine misfire issues?
No Issues - Prior to engine F 03048
39
41.94%
Issues - Prior to engine F 03048
8
8.60%
No Issues - Between engine F 03048 and G 05372
24
25.81%
Issues - Between engine F 03048 and G 05372
9
9.68%
No Issues - After engine G 05372
12
12.90%
Issues - After engine G 05372
4
4.30%
Multiple Choice Poll. Voters: 93. You may not vote on this poll
Engine Misfire Issues
02-11-2017, 11:33 AM
#31
Race Director
Thread Starter
02-11-2017, 02:43 PM
#33
Do we have one with issues on an F engine later than F03047?
02-11-2017, 03:12 PM
#34
Race Director
Thread Starter
02-11-2017, 04:07 PM
#36
Originally Posted by Princealidds
How do you the engine numbers? I know it's F
You can also open the frunk and see it on the passenger's side of the frunk cover if that makes sense
02-11-2017, 05:36 PM
#37
Nordschleife Master
Between F 3048# and G #5372 . How do we know if its an F or G with a general response since there are some differences between the last F and first G (i.e. rev limiter and valve springs)?
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Black gold (12-09-2021)
02-11-2017, 05:50 PM
#38
Nordschleife Master
The DLC is just a bandaide. The main factors I think that ameloriated/ resolved the issue of upper valve train failures were (a) revised oiling with the F and G (b) revised rev limit with the G and revised valve springs with the F replacement and G engines.
The failing valve trains exhibited wear on specific lobes. Wear is from excessive pressure and lack of lubercation on specific lobes. Not lack of DLC.
Even without DLC a valve train should last 100K miles.
Increased oiling, reduced revs ergo less pressure and heat and revised springs for reduced pressure equals less or minimized wear.
The failing valve trains exhibited wear on specific lobes. Wear is from excessive pressure and lack of lubercation on specific lobes. Not lack of DLC.
Even without DLC a valve train should last 100K miles.
Increased oiling, reduced revs ergo less pressure and heat and revised springs for reduced pressure equals less or minimized wear.
02-11-2017, 06:27 PM
#39
Race Director
Thread Starter
Waxer, can you point me to data showing these changes? I am not aware that the GT3's RPM rev limit dropped from 9K between those revisions.
02-11-2017, 08:20 PM
#40
Nordschleife Master
02-11-2017, 08:41 PM
#41
Race Director
Thread Starter
Yeah, I had a feeling. I am really trying to focus on the GT3 since all of the failures (I think) are attributed to them. I should clarify this in the original post.
02-11-2017, 10:06 PM
#43
Race Director
Thread Starter
02-11-2017, 10:25 PM
#45
Three Wheelin'
At the outset of there cars there were lots of threads regarding break in. One group argued for going by the book, another arguing that such was an old wives tale and that the car should be flogged right out of the dealers lot. AP clearly stated in RRV that break in is essential. I wonder if there is a correlation between break in and longevity/failure.