Smoking Cummins 855

The 444 cumins is a special type of cummins many guys hate them. You need a guy who know the 444 step timing pump secrets. They like to blow apart if not tuned correctly every 400,000 or so miles.

 

But they stop smoking when warm driving on road at speed. If tuned fairly accurate.

 

Sounds right.
Search building a high performance Cummins engine. By Bruce Malonson from Pittsburg Power. It's a long pdf about Cummins 855 stuff.

 

The 444 was in production from the first BC4 until the end of big cam truck production, many different variations and CPL numbers.

To the OP, how did you time it and did you reuse the old timing key to ensure you got it close to spec?

Thing about a PT system is that a miss comes from injectors, you need to get the truck to someone that knows how to set the overhead, you need a tool to hold the STC tappet up when you set IBC, and OBC torque settings change depending on the engine.

 

It is also not the correct way to do things, he pushes retarded timing because he wants people pulling these engines down to 1400rpm he also pushed changing the gear pump as well, none of this is needs if a big cam is being driven right and never pulled below 1600rpm.

He would have everyone cranking fuel pressure when a simple injector change to an increased flow injector will take stress off of the cam and make more useable power.

 

You can test that STC valve with regulated air, you should be able to make it shift timing.

 

Do you know 855 engines? I do not except for what I've read.

 

When you put the engine together after cam change did you time accessory drive with the cam?

 

Yes, I help many people on a regular basis with their 855s.

This is my 855, the injectors in it flow over 3 times as much as a stock 400 injector. I built and speced this engine myself.