s52 cams?

[1fastm50]

Im intersted in buying these cams, owner thinks theyre s52 cam but isnt quite sure cuz he also had a s50 cams. Is there anyway to tell the difference between the two? Thanks in advance.

[MR 325]

S50/S52 are more or less the same anyway and can be interchanged with no issues.

[scottinAZ]

S50/S52 are more or less the same anyway and can be interchanged with no issues.

isnt there a difference in journal diameters between the two?

Other than that (if in fact they are different), as long as the proper sized trays are used, they are interchangeable

[Lakis]

I split my S52 exhaust cam in half because previous owner switched exhaust / intake journals around. AWESOME site when you see half a cam turn!!!

[1fastm50]

Ive heard that the lift on the s52 cams is a little bit more, so wouldnt that make them better than the s50 cams? I just want to make sure im getting s52 cams and not some other ones. Do they have a number by which i can go by?

[10Toes]

They are different, the best way is to measure the lift. The biggest thing is to make sure you are using the right trays.

[ACHTUNG]

I'm not sure if their markings are different between S50 and S52 but I have a set of S52 cams that I'm storing right now and they read:

Cam 1 (not sure if it's intake or exhaust cam): GC 0974 on one side and 1703 891 on the other side.

Cam 2: 178 C on one side and on the other side it reads C6 K

Hope this helps

[VinniE30]

Ive heard that the lift on the s52 cams is a little bit more, so wouldnt that make them better than the s50 cams?

Nah you got that backwards. S50 cams have slightly higher lift than S52 cams. That's part of the reason why the S50 is rated the same as the S52 in stock form yet has less displacement.

[tttoon]

The only cams that have different bearing sizes and need their own cam carriers are m50tu cams. s50, s52 and m52 are all interchangeable.

[hwy84]

Teh intarwebz iz for liez

Watch out for internet fallacy...

S50 and S52 cams are identical lift and duration.

I am running s52 cams in my s50. No tray swap is required.

See the post below, from this forum.

Originally Posted by ed94r
The S52 and S50 cams are the same for lift (10.3/9.7mm) and duration (252/244).

The only difference is the cams are built from different cam cores, although they are both hollow cores. The S50 (M50 family) cams are built from "round" cores and the S52 (M52 family) cams have areas where there is additional material on the cam between the lobes and this material is squared off instead of round. I would assume that if the cores are the same material and core thickness, the S50's would be lighter in weight because they have less material in the areas between the lobes.

The reason M/S52 cams won't fit the cam trays for the M50 (only) is the square cores of the cams interfere with the tray. The S50 trays are unique to that motor, and M/S52 cams will fit an S50 tray ONLY. The S50 tray and M/S52 tray are the same P/N.

The whole reason I know all this is I've been swimming in cam details for the last few weeks. I was sold an S50 motor that actually contained M52 (2.8L) cams. The situation has recently been addressed and the appropriate cams (S50) are now making themselves at home in my motor.

Be careful out there when buying cams. Don't assume what cam you have by the casting number on it. You have to measure the lift to know for sure.

Just as an example, a 1718888 cam casting correlates to a S50 exhaust cam. It is precisely the same p/n stamped on the Group N 2.5 cam. These two cams have the same casting#, but different lifts and durations.

The Schrick 2.5L non vanos cam has 1738369 stamped on it, and so does the S50 intake cam.

You gotta measure the cams to know for sure.

Ed

[328ijunkie]

http://forums.bimmerforums.com/forum/showthread.php?t=1559524

[bimmer630]

The Schrick 2.5L non vanos cam has 1738369 stamped on it, and so does the S50 intake cam.

You gotta measure the cams to know for sure.

Ed

Sorry to revive an old thread, but does what you are saying here mean that the 1738369 stamping ONLY applies to shrick cams and S50 cams, OR can this # also be on a 2.5 cam? Im trying to figure out if this motor I just bought has anything done to it.. the guy said it had different cams in it

thanks

[328ijunkie]

Dont go by stamping at all.

[bimmer630]

...yeah ive read that. Im far too lazy to remove the cam to measure it.. I think I bought an M50 to mock up my engine bay for an S50

[328ijunkie]

Look at my thread. You can visually tell the difference.