964/993 Steel Gear Intermediate Shaft

[Cupcar]

Has anyone used the steel gear intermediate shaft from a 964/993 instead of the usual earlier aluminum gear intermediate shaft?

[Steve@Rennsport]

Oh yes,.....

Far more durable.

[Cupcar]

Thanks.

[Dennis Kalma]

So why did the factory originally make them out of aluminium? Was it a weight or noise question, I guess I am just wondering if there is any downside for using the steel part....


Dennis

[Steve@Rennsport]

Originally Posted by Dennis Kalma

So why did the factory originally make them out of aluminium? Was it a weight or noise question, I guess I am just wondering if there is any downside for using the steel part....

Dennis

They did it to save weight without compromising durability. Noise signatures are about identical....

The steel ones are preferable for engines running non-OEM valve springs (there are many versions). We are seeing wear in these unlike anything previously and may be due to using oils without sufficient ZDDP.

[Cupcar]

All the Porsche factory race motors use steel gears don't they?

The shaft pictured in my 935 parts book (930.105.017.00) looks like the 964 steel shaft but with aluminum chain sprockets.

By the way, the 993 steel shaft comes with the crank gear but not chain sprockets while the 930 aluminum gear shaft comes with chain sprockets but not the crank gear.

Adding things up to compare pricing of both shafts to include the parts the other is missing (crank gear and sprockets on both shafts), the 993 steel shaft assembly comes out almost $100 cheaper.

[Steve@Rennsport]

Originally Posted by Cupcar

All the Porsche factory race motors use steel gears don't they?

All 964 & 993 based race engines, yes.

The shaft pictured in my 935 parts book (930.105.017.00) looks like the 964 steel shaft but with aluminum chain sprockets.

Its close, yes. I just sold some of my left-over 935 items and thats what they looked like.