So at my shop Im often swapping cams and such around and had an issue telling the difference between M52 and a set of S52 cams i had purchased from a motor. I did this comparison to verify that these were in fact S52 cams i had purchased to go into my customers motor.
Three cams shown. A used scored to hell M3 cam from my motor is on the left, a M52 cam from a customer motor is in the center, and a better condition cam i just purchased for another customers motor is on the right always...
Some things to note:
-You can see the major differences between the lobes.
-notice the high scoring sets of journals on each cam. All three cams have concentrated wear on only a few journals.
-Wear is always significantly worse on the exhaust cam.
-Note the TDC stamping differences on the cam block squares. The M52 is apart and the two S52s are together and offset to one side on both cams.
-Part Number stamping is of absolutely no significance. The M52 intake cam and the new S52 intake cam both have the same part number stamped on them in the same place where as my old intake cam(S52) has a different number stamped elsewhere
-Note the two different "BMW" stampings between my cam and the M52 and S52 cam
-All three appear to be from the exact same casting IE no differences between the balance cutouts and the wrench flat section
-The S52 Cams' squares' for the cam blocks appear trapezoidal, where as the M52 cam's is very square
-The stamping on the intake cam is in the same location for all three, but this time the two S52 part numbers match, including the letter("178F","890G","178F")
-All three intake cams have BMW stamped in the same location
-The stamping on the intake cams near the block squares is different for all three("R1","R4","R2")
-Also lastly notice the color differences between the three, the M52 cam is "bronzer" than the rest. This is prob caused by engine temps/oil choice between the motors and the fact that the bronze one was reciently run where as the other two have been sitting for a while
More Pictures:
http://picasaweb.google.com/davewmar...CamComparison#
Exhaust
Intake:
so that's how that works
nice Grassroots sitcker
thread is full of win
thanks!
-Rich-
How much lift do the different cams make and any way to measure duration?
1997 Byzanz M3 4 door 5 speed. (1 of 37 factory 5 speeds, 1 of 88 total produced)
TMS power pulleys, V1, E21 trans mounts w/AKG cups, AKG derlin shift tower bushing, 80/88* fan switch & fan delete, Borla XS dual in/out muffler, 4300K HID's in Euro housings, PowerFlex RTAB's, 17x8 ET15 Racing Dynamics RGR wheels, GC coil-overs 375F/475R, 25.5mm M-tech front swaybar, tint
dang those are so similar. hard to tell
^^^^^^
interested in seeing that.
Lobe shape looks like S52s have more duration (which makes sense).
would these happen to be familiar with me? lol
you ever get a chance to compare the schricks and S52's?
great to see this going strong. thanks OP.
not enough people do this kind of stuff around here.
Is the ODB I and ODB II S52 cams the same? I notice a gear on the end for the Vanos system. Can this be removed and re-installed?
I bought a set of S52 and just notice the gear attached to my M52 cam, but not on the S52.
Thanks, Tim
1991 E31 850i 6spd - Albrex Supercharger project
1997 E36 Dinan / Technique Tuning / RMS Stage III
(just a quick convertible for the beach)
2013 F10 M5 - Feuerorange
I've always wondered something but never really found info on it, maybe someone around here will answer...
What about using a Schrick intake cam with the OEM intake cam in the exhaust spot?
s52 looks like more lift and duration than m52. schrick is even bigger. definitely the BMW cams are similar, the schrick looks substantially different.
me love my schrick's long time.
that's a very interesting comparison to see, thanks for taking the time!
Any chance of dyno testing each set ??
Dave,
Those lazy bastards at TDC finally uploaded the dyno charts on their website. Check it out and let me know what would benefit me getting the most power out of mine. I changed the plugs yesterday, and they looked like they hadn't been changed in 60k miles. (BKR6Es were put in 20k miles ago) Now, I wish I had changed 'em before taking the car to the dyno cuz car feels significantly smoother, and faster than before. Let me know when you have my parts in, and are ready to work on it.
Later.
http://tdcauto.6.forumer.com/viewtopic.php?t=3307
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