I have been thinking about getting a +3% crank pulley and have looked at the Alta and also GT Tuning. One of the reasons for the crank pulley is it would be fairly easy to remove if I ever had a severe warrenty problem.
My question is that the Alta pulley is made totally of alluminum, one piece construction. Which should make for good concentricity on CNC machines. The GT crank pulley is a two piece construction with a steel sleeve for the interference fit on the crankshaft, then the alluminum wheel bolted to the sleeve. GT claims expansion rates for similiar materials is bettter [which I agree] and also there is less chance of an alluminium hub welding itself to the steel crank upon removal. Has anyone had any experiance with difficulty in removing the pulley? Just from a machining aspect I think the tolerences are probably better on the one piece construction than the two piece. What do some of you gearheads think?

 

I've installed three Altas and removed two with no problems.

 

Anyone else have any imput? Thanks