High quality made camshaft to suit the BSA A50 and A65 models fitted with a big bore kit , this is a high lift sports camshaft profile and is suitable for use with high compression engines and for tuned engines. Use our valve spring set SRM
part number SRMSP5-RACE
Gives good mid range torque
and high RPM power , for standard stroke engines is suitable up to 7,500 RPM
When fitting new camshafts and followers , cover with cam assembly lube; always check fitted valve spring length, most camshaft and follower failures are caused by over stressed valve springs Check valve springs at full lift and make sure they are not coil bound and can be compressed at least another 0.080 inch ( 2.0mm).
Use standard BSA cam timing gear positions
Tappet gap set @ 0.020 inch for cam timing/duration check only for the figures below
Inlet opens 45 degees BTDC Closes 78 degrees ABDC = duration 303 deg
Exhaust Opens 81 degrees BBDC Closes 45 degrees ATDC = duration 306 deg
Set running clearance to 0.008 inch inlet 0.010 inch exhaust ( 0.20mm and 0.25mm )
Cam lobe lift on cam is 0.372 inch over base circle 9.45mm
Intake Duration 303°
Intake Lobe Centre 106.5° ATDC
Exhaust Duration 306°
Exhaust Lobe Centre 108° BTDC
Lobe Separation 107.3° (Cam°)
The only way to 'degree' is to either broach new keyway or make up stepped keys.
Of course you are stuck with lobe centres.