3900 LZG Cam Specs

[NateD4]

For anyone interested here are the 3900 LZG stock cam specs:

Intake:
@0.005 lift:
252 Duration
110 Centerline

@0.050 lift:
189 Duration

Peak lift: 0.270" at the cam



Exhaust:
@0.005 lift:
276 Duration
114 Centerline

@0.050 lift:
197 Duration


Peak lift: 0.270" at the cam

[SappySE107]

Where did you get that? I thought it was the same as a 3400 cam but with larger lobes.

[NateD4]

Degree wheel and dial indicator.

I have the profile for the exhaust cam done to 1 degree precision. I have to do the intake next. Then enter them in Excel. currently their are about 410 readings for the exhaust cam with about +/- 0.0005 to 0.001" lift accuracy.

Should let me find the total time the valve is open and integrate the air flow with respect to both time and crank angle. I should also be able to generate the valve train forces as well.

We'll see how well it works.

[pocket-rocket]

currently their are about 410 readings for the exhaust cam with about +/- 0.0005 to 0.001" lift accuracy.

O.o

Who needs Crane, ect to ID a cam... you are a thorough man...

[NateD4]

Anything worth doing once is worth doing right the first time.

Must be the engineer in me.... Plus I'm trying to pushing RPM limit with the DOD system. Need to have the data to tell me the loads on the valve train and to help predict float. Again a bit of trial by error....

[Kenova]

Must be the engineer in me.... Plus I'm trying to pushing RPM limit with the DOD system. Need to have the data to tell me the loads on the valve train and to help predict float. Again a bit of trial by error....

I don't know if this applies to the 60V6, but I have read that the V8s using DOD have different lobe profiles for the constant cylinders and de-activated cylinders.

Ken

[NateD4]

I verified the lift differences. It is done to remove play from the lock pin for the DOD in the lifter. The ramp angle is also slightly different.