Dry sump drive pulleys

[Ant]

Setting up HTD Belt for oil pump drive and notice on race cars they use a wider pump pulley any experience around with setting these up,

I guess the wider pump pulley instead of narrow pump pulley with flanges, means you don't have to align the pulleys as the belt is guided by crank pulley flanges and finds its own place on wide pump pulley. Not a biggie but as this car is going to do a few road miles I want the system as reliable as I can make it.

[vector1]

both my crank and pump pullies measure a little over 1.05. flange is on the crank so i can pull the belt off the pump for priming. when the engine gets hot the shaft centerlines are going to be farther apart so don't get the belt too tight when cold or set the tension with a hot engine. bigger difference if you have an aluminum engine. you should be able to pull the belt off cold without too much difficulty. i had a belt set too loose one time and you can hear the occasional tooth skip, sounds almost like a clattering lifter so you will know if it is too loose and skipping, didn't hurt the belt btw, those things are tough.