Originally Posted By cudatom
Originally Posted By rebel
He send me a pic of his new Ford unit, said his new Mopar one will look similar.

Have never ran a belt drive but will be on my next engine. With that said is there a benefit with the idler. I know many of you have lots of experience with this stuff so I figured I will get the straight scoop.
The only reason to run the Idler from those pics is because there is not a belt that is an exact fit, the pulley takes up the slack. This single idler method also can change timing, that is why the cam pulley is adjustable, it compensates for any tightening or loosening of the belt. Its not a bad design, it has been proven on tens of thousands of accurate 3 axis milling machines to drive the spindle. Tim

1941 Taylorcraft
1968 Charger
1994 Wrangler
1998 Wrangler
2008 Kia Rio
2017 Jetta

I didn't do 4 years and 9 months of Graduate School to be called Mister!