by KTA » Tue Jan 08, 2008 9:52 pm
Every engine has an optimum amount of degrees for injection to occur. Say for the 5.9 it is 40deg. If you are injecting a small amount of fuel you will need a slower cam than if you are trying to inject a lot of fuel. If you put a fast cam with a small amount of fuel it generaly hurts performance because now your delivery is only say 10deg instead of 40, so you get real spikes in the cylinder pressure rather than a nice smooth push. That is the most generic explination I can give, its really much more complicated.
Fleet of Junk: 1989 D350 627rwhp 1300 tq B-1/Hx60 twins, KTA pump/injectors, ported head, BIG fuel supply. 13.75@ 109.5mph 1/4: 1992 W350 Cab-chasis, 1993 W350 ext cab cust.370 inj Hx40/16cm 290rwhp hydroboost brakes,1984 D350 crew-cab another project.