Underdrive Pulley Questions

[jb92563]

Just had a thought...damned engineering education makes you worry about everything.

Aluminum Pulley mounted on a steel? flange.

I am wondering if there is any dissimilar metal contact issues we need to be aware of and whether the two metals need to be separated by a barrier of some kind....plastic, paint etc.

Aluminum strength suffers quickly when this is an issue and with the rubber belt whirring around I imagine there might be some significant electrical potential being developed.

Any reports of issues with this?

[seventythree]

Originally Posted by jb92563

Just had a thought...damned engineering education makes you worry about everything.

Aluminum Pulley mounted on a steel? flange.

I am wondering if there is any dissimilar metal contact issues we need to be aware of and whether the two metals need to be separated by a barrier of some kind....plastic, paint etc.

Aluminum strength suffers quickly when this is an issue and with the rubber belt whirring around I imagine there might be some significant electrical potential being developed.

Any reports of issues with this?

The factory pulley is anodized aluminum as well.

[shadrach74]

Originally Posted by jb92563

Just had a thought...damned engineering education makes you worry about everything.

Aluminum Pulley mounted on a steel? flange.

I am wondering if there is any dissimilar metal contact issues we need to be aware of and whether the two metals need to be separated by a barrier of some kind....plastic, paint etc.

Aluminum strength suffers quickly when this is an issue and with the rubber belt whirring around I imagine there might be some significant electrical potential being developed.

Any reports of issues with this?

Both the aluminum and the alloy used on the shaft are relatively anodic. Also one must consider that is little opportunity for an electrolyte to get to that part of the engine compartment. After all, the block is made of aluminum as well.