wrist pin

We run straight wall pins, but why isn't the tapered pin as good but lighter?

 

Taper wall pins go egg shape on the ends and make it difficult to remove from the piston. Lighter isn't always necessarily better.

 

Why don't more people run titanium pins?

 

Tried the titanium pins for ever. In an effort to make them resist flexing they became thicker, thicker, thicker, thicker. Finally when the pro stock boys were making the .300" wall ti wrist pins, they finally were almost good enough to not flex too much. But by then, the maraging pins were lighter and so much stronger.
Had they gone to 10-2 titanium or something of the sort, they would have found them to be strong enough at a lighter wall, but 10-2 is not the easiest stuff to find laying around right now. And certainly not cheap.
I have a bunch of the .250 wall ti pins from various pro stock teams. They are great for a solid big block, but if you are going to throw boost or big rpm's, the wrist pin needs to be solid. Because the flex lets the piston flex. Then pinches ring lands and makes you run wider clearances piston to ring, etc. Wrist pins are like pushrods. It doesn't make sense inside the skull, but every time you go bigger and heavier, you make more power. Go figure.