Cam Phasing

TT5.9mag said

Then it has to be carrying some load. Which has been my entire argument.

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It doesn’t carry ANY load or it will fail. You can leave the damn things out and nothing will happen.

It’s keyed for assembly line speed.

The reason you see blower hubs with an extra key is because the key has to do work. One key will fail. Two keys will fail but it will take more.

That’s why they have went to spline drives.

Using the key to take load is bad policy but sometimes it has to be done.

Edit: I should add that the blower loads the front of the crank much harder than NA does.

There is only room for so many bolts to increase clamp load.