900 and 750 Camshaft Swap

[motorhead715]

CB750 has an Overlap of 10.00 degrees and has in Intake Duration of 220.00 degrees. The Exhaust Duration is 220.00 degrees. Your Lobe Separation Angle is 105.00 degrees. The Inlet Cam has an Installed Centerline of 105.00 degrees ATDC. The exhaust cam has an Installed Centerline of 105.00 degrees BTDC.

CB900 has an Overlap of 15.00 degrees and has in Intake Duration of 225.00 degrees. The Exhaust Duration is 225.00 degrees. Your Lobe Separation Angle is 105.00 degrees. The Inlet Cam has an Installed Centerline of 102.50 degrees ATDC. The exhaust cam has an Installed Centerline of 107.50 degrees BTDC.

 CB900 EX Cb750 IN has an Overlap of 10.00 degrees and has in Intake Duration of 220.00 degrees. The Exhaust Duration is 225.00 degrees. Your Lobe Separation Angle is 106.25 degrees. The Inlet Cam has an Installed Centerline of 105.00 degrees ATDC. The exhaust cam has an Installed Centerline of 107.50 degrees BTDC

 CB900 IN Cb750 EX has an Overlap of 15.00 degrees and has in Intake Duration of 225.00 degrees. The Exhaust Duration is 220.00 degrees. Your Lobe Separation Angle is 103.75 degrees. The Inlet Cam has an Installed Centerline of 102.50 degrees ATDC. The exhaust cam has an Installed Centerline of 105.00 degrees BTDC.


Cam Timing Change                                                            Charateristic Engine Change
1. Advance Cam (s)                                                              Lowers best hp rpm range
2. Retard Cam (s)                                                                 Raises best hp rpm range
3. Less Overlap (advance exhaust and/or retard intake).          More low end torque less hp broader and lower power curve.
4. More Overlap (advance intake and/or retard exhaust).         More HP less low end torque narrowerand higher power curve.

[motorhead715]

I found the cam info on some site and used a durartion calculator from anther site to come up with the specs. I assume the measurements and calculations are correct. I plan on installing the cb 900 intake cam this winter when I replace my head gasket. I have access to a dyno so i hope to see what if any gain can be made from the cam swap this spring.

[timpetou]

Hi, I got a pair of CB900 super sport cams laying around and plan do bolt and drop in sometime soon. Need to adjust valve clearance anyway. Out of curiosity, what were your hp gains on the dyno? Do you have any hints on how to install this fella correctly? Di you adjust timing?