Purplezr2

Guys, Working on a school project for my IC engines class. We are supposed to pick a motor and then pick a sub system and tell why the they have evolved the way they have, I was looking at doing the fuel system(IP) on cummins motors, 4 different pumps really; Ve, P7100, vp44, CP3/common rail, my question is why did they change these systems, cost?, emission?, power? anyone that has some insight that would be great, back sub system is turbo, std vs VGT on new cummins.

cincydiesel

Check out the home page videos on some great information on the newer systems.. Emission is the main reason for all the continued changes.

infidel

In my opinion emissions are the only reason for engine changes.
The good old simple, reliable 12 valve with the P pump is still manufactured by Cummins for export.

Early engine evolution> http://dodgeram.org/tech/dsl/Facts/epa_changes.htm

graphitecumnz

the change from P7100 to VP44 was specifically to meet new emissions requirements that started in calender year 1998.

infidel

Well sort of...
The use of the VP was an unplanned, last minute, stop gap way to meet emissions but was only undertaken because the new CR engine wasn't ready.
Cummins has stated publicly that they were very disappointed with the VP pump.

Purplezr2

Why did they switch from ve to p7100 pumps?

infidel

According to the link above:

Improvements to meet Jan 1, 1994 EPA standards:

* Inline Bosch P7100 injector pump for higher injection pressure and more precise timing

jesussaves

MORE POWER!!!!!