BMW 4 & 6 CYLINDER PROFILES

            There are two different 4 cyl. cams.  The difference in the two is in the direction of the gear teeth on the rear of the cam.  There are also two different 6 cyl. cams.  The older style with 4 bearings and a large nut for the timing gear, and the newer ETA cams with either 4 or 7 bearings and a bolt & dowel pin for the timing gear.  The 278-310 degree grinds require heavy duty springs, either lash caps, larger eccentrics, or longer valve stems.

ROCKER RATIO 1.25:1   NEW STYLE ETA  1.55:1

 

GRIND NO.

SEAT DURATION

.050 DURATION

CAM LIFT

LASH

APPLICATION

STOCK

225

187

.271

STD.

4 BEARING 325, 325e, 528e

STOCK

260

209

.257

STD.

7 BEARING 325I, 325is

STOCK

260

208

.277

STD.

4 CYL. 5800 MAX. RPM.

SEMI

260

211

.276

STD.

IMPROVED STOCK 4 CYL.

STOCK

260

218

.270

STD.

7 BEARING JOURNALS

STOCK

258

214

.315

STD.

HIGH LIFT 528I, 733i

TURBO

266

219

.290

STD.

530i, 533 . EXCELLENT CAM FOR 318i , 320i

STOCK

266

222

.315

STD.

HIGH LIFT 6 & 7 SERIES

695-12

278

222

.288

STD.

WIDE TORQUE BAND. WORKS WITH MOD. ELEC. FI.

71-12

284

230

.324

STD.

4-7K.  REQUIRES HEADWORK. 9.5:1, MAJOR FI TUNING

73-14

292

227

.327

STD.

10:1, CARBS, AND HEADER

775-12

310

239

.317

STD.

10.5:1, CARBS, AND 1 5/8 HEADER

79-15

315

254

.335

STD.

11:1, LARGE CARBS. WELDING REQUIRED

81-15

324

260

.336

STD.

FACTORY PROFILE, WELDING REQUIRED

 

NEW BILLETS ARE AVAILABLE.  6 CYL. CAMS ARE AVAILABLE WITH BOTH 4 & 7 BEARING JOURNALS.  LIMITED AVAILABILITY ON SOME MODELS.  CALL FOR SPECIFICS.  

 

 

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