400 big cam advice.

STC only changes timing at low fuel pressure, it is designed to control low idle smoke that comes with retarded cam timing, it is in advanced mode at low idle and changes at 50psi of fuel pressure and returns to advanced when fuel pressure drops back below a certain point.

The timing is what controls the longevity of the engine and pistons.

The guy that asked about marine engines should know that there are no marine engines rated higher than the truck engines which are rated no higher than 475hp.

There are two generator drive engines that are, one rated at 535hp and one at 605hp.

 

1211s, are 400s.

 

I run double the fuel of a standard 400 big cam and around 48psi on a hard pull, want to guess how many head gasket problems I have had?

 

I you drive it right none

 

I have a 444 1211, they also had a 1210. their are several CPL's for the few short years they put out 444's a 444 is a 400 only timed 5 degrees different and slightly higher fuel pressure. but their are many variations of those settings, all other parts where mostly the same. exceptions might be for instance the after cooler had 444 in big numbers on it. In the years of the Big Cam's, Cummins would have many different part numbers for the same exact part.

 

I hate to tell you but you were misinformed, the 1211 was a dual rating engine of 365/400hp.

This is directly from cummins, notice where the 1211 sits on the list.

 

Cat does that mean close to 400 psi rail pressure? My experience was mainly trying to get 400 or 425 out of a 290 type thing which is only about a 40% increase. Most easily done by finding a higher HP CPL that used the same camshaft and key. Then add the other needed parts. That was dependable long term HP and efficient at the time. Arguments back then were can you run high compression, non turbo, pistons with a turbo? Zero lash, no 5 inch pounds, 187 travel, no 189, valves tight, no loose. Dual air filters and mufflers. There is HP in attention to detail. Now people are talking about a 100% increase on top of that. Some as I understand it retard the timing to lower cylinder temperatures and flood it with fuel for power. Does that sound long lived and economical to you? 1211-365's bring back remembrance of a very unfavorable smell to me. That is the smell of burning Ben Franklin's. All related to the fuel system. Camshaft failure always seemed more related to people that did not know how to run the overhead and or put engines together dirty than fuel pressure.