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pstrother
03-27-2005, 15:04
Hi Doc,
Just came into a Ford F-Series truck with a B5.9-190 Cummins with a Allision auto transmision. It is currently setup to gov out at 65mph @ 2850 rpm. How hard is it to get it up to hwy speed? Will adjusting the gov stop solenoid rod solve my issue.
Thanks smile.gif
dieseldummy
03-27-2005, 22:28
Maybe I can be of some help here. Depending on what type of injection system the cummins has will dictate what you can do for more rpm's. However 2850 sustained is probably enough for the 5.9... Let us know if it has an inline pump, rotary pump, or electronic.
pstrother
03-29-2005, 03:43
It has a in-line Bosch pump. I got some numbers off the data tag, PES6P120A120RS7350, 0-402-736-867, & 76704-02643. I have know ideal what these are, nothing on the tag that I could read indicated which one was p/n or s/n.
dieseldummy
03-29-2005, 18:54
I'm not real familiar with the inline pumps, but adjusting the stop you mention would probably help, but I think the real obstacle to overcome is the governor springs cutting fuel at higher rpms. Check out piers diesel, diesel truck resourse, and turbo diesel register. Piers is for the cummins like Kennedy is for the GM, and the other two are the Dodge forums. Hope this helps you out.
britannic
03-30-2005, 06:16
Don't increase the rpms without changing your valve springs to at least 60lbs - the stock 30lb springs will allow valve float and engine damage.

Swapping the governor springs is just one part of the process, but you won't see much in the way of results until the fuel plate is changed in the P7100 Bosch pump, so that the engine will get more fuel to make more rpms. The stock plate starts defueling at about 1500rpm (in the Dodge set up), so by 2850rpm, there's not enough fuel to go any higher, whether the governor can or not.

There's a lot of mods that can be made to increase power and rpm, but my recommendation is to first follow the discussions at the Turbo Diesel Register (http://www.turbodieselregister.com), which is the Diesel Page equivalent for Cummins 5.9L engines.
pstrother
04-01-2005, 03:30
Thanks for the info, I contacted Piers and they were very helpful with everthing. :cool: