Flywheel differences
 

Hi
Of the nine bolt 915 flywheels between 78 and 86 there are 3 different variants: 78-79, 80-83, 84-86.

What are the differences, espacially 79-80, I know the DME reference signal came in 84.

In short I ask because a would like to know if I could use any of these flywheels on my 84 engine that doesn't use the stock flywheel sensor anymore?

I've recently been doing some research on flywheels, and from what I've found the difference between the early SC (78-79) and the later SC (80-83) is in the type of pilot bearing used. The early SC pilot bearing must be pressed on to the flywheel, whereas the later one is attached with 3 bolts. The biggest difference between the SC flywheel and the early (pre-87) Carrera flywheel is the teeth used for the DME reference signal. If you're using carbs or some other ignition that is driven by a crank pulley sensor then you should be fine with a SC flywheel. The pelican catalog shows the same pilot bearing part number for 80-86 911 (later SC to early Carrera).

Jon, thanks. I thought it was something like that since the pressure plate and clutch are the same from 72 to 86.