M//DREI

awesome information, thanks! I do have the build sheet, and I just called my indie, the engine is indeed original to the car.

JMLavoie

His maintenance scheduling for lack of a better term will enunciate the type of engine his car has.
For example, my 00 C2 has:
996 110
M96 04-66Y G9600-10
L92U, & so on ... for each of the options the car has.
The Indy should have looked there first to find out what type of engine the car had in the 1st place.
I believe that car is more late production than early (Aug to Dec build) which might explain why it has the bigger internal IMS bearing but I'm on soft ground here.

Redline911

I have a 1/05 build c2 as well. Interested to learn which engine I have. Where is the engine number?

M//DREI

https://rennlist.com/forums/997-foru...s-bearing.html

fanny bay r1

This may be too simple but have you opened the frunk lid and just read the sticker???

M//DREI

fanny, I dont think I will be able to convence you over this forum. if you want, call LN Engineering or your dealership, and they will verify the fact that there is no way of accurately determining through VIN, engine number, or build date. Dropping the tranny and visually inspect the IMS is the ONLY way to know for sure.

MLindgren

So have you determined your c2 non-s 997 has an M97 engine?

M//DREI

I think I am a little confused as to the M96/M97 designations.

With that said, the clearest way I can put it is I have a 2005 3.6 engine, with a M97 design IMS bearing.

Here is what I found from LN Engineering website

"MY02-05 will need a single row Retrofit™ kit, although depending on how late the build date was, there may be some MY05 vehicles with the updated M97 IMS, which is not serviceable, at least without teardown of the engine."

MLindgren

I believe m96 is the engine designation for the 3.6 cars and m97 the designation for the 3.8 cars. The confusion was when you said you had it taken apart to determine whether or not you have an m96 or m97 engine. The engine series in right in the engine number stamped on the engine case and visible without pulling the transmission back.

M//DREI

Ok, got it. Thanks for the info. My engine number starts with m96, I thought a M97 IMS bearing also meant the motor was a M97. My bad

fanny bay r1

Or like I said you just open the frunk and read the sticker. You can't tell whether the M96 engine absolutely has a single or dual row IMS bearing but you sure as hell can tell if its an M96 or M97 engine!!

alexb76

You're good to go... rare to find Feb. 2005 cars with upgraded IMS.

JW911

This is a different perspective on "early" production. The 05 997 was introduced in mid 2004 and I would estimate that production started in the late spring of 2004. And 2006 MY cars were probably being produced in late spring or early summer of 2005. So I have always considered early production MY05 cars to be those produced in 2004.

street rod

Just to clarify you have a larger "single" row bearing. They stopped using dual row bearings after 2001. If you indeed have the larger bearing then just drive it and enjoy.

M//DREI

yes, the large m97 IMS bearing is what i meant.