Differance between 930/02 and 930/04 motors

[GMR911]

Hi, does any one know the differance between the 76/77 930-02 motors and the 78/79 930/04 motors. The 930/02 motor has 20 more hp nad 14 fp of torque. They look like the same motor on paper. Does anyone know how increase in power is developed? Thanks

[GeorgeK]

Hi GMR,
the 930/02 is the Carrera 3.0 engine. It is based on the Turbo 3.0 block and crankshaft, it is WAY lighter then the 930/04 (SC engine) based on the Turbo 3.3engine block.
GeorgeK

[930Chas]

I believe the 930/04 engine should have more power, not the 930/02. This would be obvious just because of the addition of the intercooler and the increase in displacement.

[GeorgeK]

Chas,
these are NA engines, not turbocharged.
GeorgeK

[930Chas]

Thanks George. Oops, I have no idea what the identification of my motor is so I assumed we were talking about the 930 motor. My mistake.

[Bill Verburg]

Noah and George have hit the high points nicely, some additional data.
My 76 C3 930/02 engine weighed in @ 405# dry w/ssi/flywheel/no clutch
the spec book lists 930/04 as 441# dry

The C3 used a 245mm 5 blade fan driven @ 1.81
The 930/04 used a 226mm 11 blade fan driven @ 1.81

Both use the same cams but the C3 timing was retarded 6&deg

The C3 used points in a cw rotating dist
930/04 used pointless ccw rotating dist

C3 used a reg speing ctr clutch
930/04 used rubber ctr

All C3 use Mahle nikasil cyl
some 930/04 used Mahlr nikasil some used KS alusil