part throttle power

[hdm48]

after doing some serious testing and checking i've found a way to improve the around town power that doesnt require flooring it. under the diaphram there is a nylon stop. it looks like a thick washer. this stops the excentric from traveling down too far. i noticed my fuel pin wasn't traveling all the way up the taper so i wanted to see what would happen if it did.

so i shaved . 090" off it.

WOW!!!

part throttle power went way up. i checked with Northland diesel and they said it would not effect my max power settings so it should be safe and no, the pin will not travel too far. it can't by design.

i'm very happy with this little adjustment.

just thought i'd share

 

[EOliver]

Hmmmmm... .



I guess I know what I am doing after work today.

 

[Lil' Dog]

Thats what makes this site great. Little tid-bits of info from on the road experiments. Great stuff, another note for the archive!!!



I'll be trying that one too!



J-eh

 

[RDavidson]

Since you like tinkering try this. Looking at the injection pump loosen the jam nuts and remove the metal rod connecting the throttle linkage ball crank to the injection pump throttle arm. Remove the return springs. Move the ball and head from the outer hole on the injection pump throttle arm to the inner hole, the one nearest to the pump. Both of the holes are a little oversized for the stud so you need to make sure you push it toward the rear of the truck before you tighten it. Lubricate both ends of the rod with WD-40 or something similar and reinstall it into the ball heads. Try to start both ends at the same time. This is important so you can get the maximum adjustment in the rod. Twist the rod to remove all the slack between the injection pump throttle arm and the throttle linkage ball crank. Start the truck and twist the rod to make sure you don't change your idle speed. Tighten the jam nuts and replace the springs. The kickdown spring will rub slightly on the metal rod. Now you can back off the max RPM stop screw and zippy-do-dah watch your RPM, shift points and top end go up. You may have to adjust the TPI if you don't go into OD at WOT. Also, if by chance you still have the plastic balls and heads now would be a good time to upgrade to the steel ones. Happy motoring.