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So it's not by the hour it's by Km. They recommend an engine refresh at 10k km and a tranny refresh at 5k km. The engine refresh is cheaper than a cup. You send them the engine and a 25k check you'll get a refreshed sealed engine back. The tranny is a 6 speed sequential made by Xtrac. That can run 8-15 k
The brakes last for a very long time cause they're enduro pads. Overall the running cost is on par if not less than running a cup but you pass cup cars while doing your taxes and sipping your cappuccino
Last edited by GT3 Jockey; 07-05-2021 at 10:25 PM.
This is for the 991.2 Cup and out of the Technical bulletin dated May 2019 - "Total Engine Runtime":
"Porsche Motorsport North America would like to inform you that maximum mileage for the 911 GT3 Cup (991 gen II) engine is limited to 200 hours. Accordingly, no further revision is intended for an already revised engine."
PMNA will perform a 'revision' at 100h and at 200h, they offer for purchase a new engine.
I purchased my car at 36 hours. I have run it at 9 or 10 HPDE events (2-3 days each). It's been over a year and I now have 61 hours. At approx. 100 hours, I will send it out for a 'revision' by PMNA. At this rate, I expect it to be a couple years. And to add another 100 hours after that, may be another 5 years of 10 or so events a year. That's good enough for me to have fun. And it isn't like the engine instantly fails at those hours.
Since these cars will be cycled out of Porsche sanctioned events (e.G. Carrera Cups etc.) you can just run the damn thing after the 200h-mark until it blows... And then you buy a new one! :-)
This is for the 991.2 Cup and out of the Technical bulletin dated May 2019 - "Total Engine Runtime":
"Porsche Motorsport North America would like to inform you that maximum mileage for the 911 GT3 Cup (991 gen II) engine is limited to 200 hours. Accordingly, no further revision is intended for an already revised engine."
PMNA will perform a 'revision' at 100h and at 200h, they offer for purchase a new engine.
I purchased my car at 36 hours. I have run it at 9 or 10 HPDE events (2-3 days each). It's been over a year and I now have 61 hours. At approx. 100 hours, I will send it out for a 'revision' by PMNA. At this rate, I expect it to be a couple years. And to add another 100 hours after that, may be another 5 years of 10 or so events a year. That's good enough for me to have fun. And it isn't like the engine instantly fails at those hours.
Since these cars will be cycled out of Porsche sanctioned events (e.G. Carrera Cups etc.) you can just run the damn thing after the 200h-mark until it blows... And then you buy a new one! :-)
Since these cars will be cycled out of Porsche sanctioned events (e.G. Carrera Cups etc.) you can just run the damn thing after the 200h-mark until it blows... And then you buy a new one! :-)
Ha, ask what the new motor price is from PMNA before you even consider that to be a remotely good idea...
Some of my personal thoughts on this engine matter
The difference between the 3.8 and 4.0 engines in regards to rebuilding:
The 3.8 has replaceable cylinders and therefore you can remain the same crank case 'forever' and keep rebuilding 'endlessly'
The 4.0 has fixed Nikasil cylinders into the crank case that can't be replaced.
I have had several 4.0 engines rebuild now after ±120hrs. All were in perfect shape with perfect leak down before.
Since you now, with the 4,0 only change the pistons and not the cylinders (apart from the other parts like chains, and valves etc)
the first 4.0 engine rebuild is cheaper then from a 3.8
If Porsche recommends these engines to last between 200hrs and 300hrs, they effectively mean the crank case.
Because everything else can be rebuild over and over. You would only need to buy a new crank case for the 3rd rebuild
And yes, the 3.8 has the same crank case as the bulletproof 996 and 997 Cup cars
The 4.0 GT3 Cup engines though, are identical to the street 4.0 GT3 engine and are even down-tuned for durability
The current 992 Cup cars have also identical engines to the 992 Street cars.
Porsche likes us to rebuild these engines a lot. They hates blown engines coming on the race track and in the media.
Therefore they play is super safe.
There are several street GT3 cars have run for 50.000 km non-stop on the Nordschleife as taxi's who don't show any sign if leakage
I have seen already 4.0 Cup engines with 150hrs that run perfect still
So if it were my money, i would also first run these engines till you loose more oil then normal,
till you see un-equal compression between all cylinders, and till you start seeing a leak down percentage over 15% cold.
I think the 3.8 and 4.0 engines could go over 200hrs if well taken care of on a regular basis
(oil and filter changes, and warm up and cool down)
Maybe Porsche does not like to sell these 4.0 crank cases. I really don't know
But i am almost sure, the usual suspects doing these rebuilds, will have found a solution to that, once all the 4.0 liter engines starting to reach the 3rd rebuild phase
The street GT3 crank case is identical too
If a mezger rebuild is recommended by Porsche at 50 hours, yet they do 200 hours, how far will the 100 hour quoted 4L go? 200? 300? More? Porsche said the engine is good for over 300,000 kms without rebuilding in the road going 991.2 GT3. Divide road km by 5 to get par track km…60,000 track km/150 kph average speed = 400 hours. 4x the Porsche quoted figure, just like the mezger. Yeah, it’s using basic math to twist the outcome a little, but as Q&A said, Porsche is always understating engine life because it’s better for business, in more ways than one.
07-05-2021, 10:19 PM
