ChicagoWhale

When you say that you have "examples of cars," I'm curious how many examples you actually have.

alpine-al

Here are several threads with relevant information:

Poll: Engine Misfire Issues

991 gt3 engine misfiring / letters

2015 GT3 misfire engine - help

Dundon Finger Follower Wear/Cam Wear

Engine Control Fault

Does F engine top end rebuild solve the problem?


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bronson7

Thank you for pulling all those threads together.

d00d

I went back through the `How many 15-16 gt3's have engine replaced?' thread to summarize;

Where to find engine number;
https://rennlist.com/forums/991-gt3-...l#post12357344

E00000: MY 2014 (GT3)
E1xxxx: E replacement engine with fixed rod bolts, added cold rev limiter
F00000: MY 2015 (GT3)
F03048: Revised heads, valve springs, camshafts, finger followers with updated DLC, updated ECU
G00000: MY 2016 (GT3, GT3 RS) additional oil sprayers, revised oil pump, filter neck, filter
xxxxxx: Service bulletin to replace ignition coils, spark plugs, and increase mid range oil pressure
G05374: (R, GT3 RS) DLC camshaft lobes, revised ignition coils, increased mid range oil pressure

There are three piston and two piston ring versions for the GT3, unknown at which serial numbers these changed.

https://rennlist.com/forums/991-gt3-...l#post13492343

jamie@dundonmotorsports.com;
The issue with the wearing of the finger followers isn't the DLC wearing, the DLC is likely not causing much of an issue circulating in the engine, the issue is the metal/metal wear between the cam and finger follower. Any metal that circulates through the engine creates abrasive wear. The amount of time for the ecu to signal a misfire fault due to valve opening deviation (finger follower wear) is likely long enough for the metal to be circulating for some time. The oil filter will only get a % of the metal circulating. So that means the metal circulating will get into all the areas the oil circulates through and issues may not show themselves for quite a while (think bearing wear causing spun rod bearings, scored cylinders, compression/leakdown issues etc...). The issue could show itself many years later, but typically once wear starts, it continues on it's own as the surface finish/oil holding capability is changed...

https://rennlist.com/forums/991-gt3-...l#post13557102

Macca;
I heard a little more about the "failed" 991GT3 RS G engine last night. Delivered late August, Germany, 14,000 km, 8000km on track (approx 35 days) including a number of sessions this season at the Germany one make series. cEL light with scored finger rockers being replaced with the new DLC cams.

https://rennlist.com/forums/991-gt3-...l#post13645342

jamie@dundonmotorsports.com;
The issue has to do with the force that the lifter is pressing the finger follower against the cam lobe, and the lack of space left between the lobe and the follower for an oil film.

robmypro

The last count was around 35.

robmypro

Update: Heading to the copier today. I decided to get this all printed in color, and on higher quality paper. So the packages will be printed today, and go out Monday morning. I felt the higher quality production was worth waiting an extra day or two.

bronson7

Rob, you think of it all. Well done.

mcsmcs1

Thank you for all your work on this!

GT3 KSA

thank you for all your efforts

robmypro

Thanks guys. My pleasure.

john weires

Rob, your effort here is above and beyond the call. I hope for a good outcome for all 991.1 GT3 owners.

robmypro

Thanks John. Me too!

911dev

much appreciated!

robmypro

Quick Update Guys. All letters were mailed this morning. Now the waiting begins.

Also, I hadn't checked my inbox in a few days. How many people purchased these cars? LOL

robmypro