Joined
·
3,701 Posts
What is the correct diameter of a JLP lower pulley?
Agreed, but I think it's safe to say that he was specifically referring to the size of a 10lb lower, which is it's common name regardless of how much boost you actually see. A 10# lower stops being that when you have a different upper pulley, which is what you were referring to.Most use 10" = 10#s. But those numbers are so arbitrary as to be near useless. It is always best to talk about pullies using ratio rather than #s of advertised/expected pounds of boost. Some manufactures purposely run slightly bigger that their competitors to make it seem their product is better. It is not. It is simply increasing ratio. This response is not necessarily to the OP as I am quite sure he is fully aware of this info. But it is good for others reading the thread)
Jim
Not only changing ratio via upper pully. Also with airflow changes whether intake or exhaust. Or extreme like cams or porting. And any combination of these listed. Add to that aftermarket blowers and the basic terminology really gets silly. Ratio works across all platforms and combinations.Agreed, but I think it's safe to say that he was specifically referring to the size of a 10lb lower, which is it's common name regardless of how much boost you actually see. A 10# lower stops being that when you have a different upper pulley, which is what you were referring to.