There are few people left who understand the low-flow system. You can get that in a M-11 (663 Cid) engine today. Nothing wrong with them, but 400 hp is considered "low" by todays standard. Haveing said that, I ran my 1st 1 million miles with the Big Cam 4's and got over 1.3 M out of my fixed timed "315hp" that I later turned up to around 400. The Big Cam 4 has the screwy low-flow cooling system, and while it does work, it doesn't handle high hp very well. How about the BC4? Do they both have the same Holset turbo? Is the BC4 still mechanical?Įrich The Big Cam 4 and NT88 are both mechanical and are good engines esp if you don't try and get much more then 400 hp. and if you keep jumping around you never get ahead of it. No matter how well you look things over, there are going to be problems to repair.
Then you get a new truck and have to start in all over again. Everytime you buy a new truck, you have to get rid of the old, and hopefully you got to know what shape it was in. but you will be far ahead if you buy a good truck and can drive it, makeing a living then decide what you would like to, and can afford to, change. I'm not saying buy a IHC 450 2bbl tractor and try and make a liveing. Moved my 1st 115k load from Chicago to Ft Sask. 1st make sure the truck is going to make you money, then worry if it has enough power (with in reason). You can change that down the road if you have money and feel the need. But 400's are easyer to find and cost less. guys are easly getting 600 hp oout of that block without doing too much too them. They had a 475 twin turbo factory rated engine.( automotive). What is the maximum hp you can get out of the BC3 without ridiculous modifications(like for sled pulling)? How about the BC4? Do they both have the same Holset turbo? Is the BC4 still mechanical? it doesn't refer to the Hp setting but the design level when biult.īy erich.vongeist - Sunday, Septem10:14 AM you can have a big camII that is 400 hp or a big cam IV that is 315 hp. There are different rateing for each family. There are changes, some of which can be retro-fitted to the older blocks, some can not. Each time they made a design change to the "big cam" it got a new number. So to tell the older 855 from the newer block, they called the new block the "Big Cam" as that was the main differance between it in the older "small cam" engine. They were haveing trouble with cam lobes wearing, and incressed the size of the cam allowing for longer "ramp" times on the lobes. It had small bores then was bored out to 855 CID. They stopped useing the "A", as most of their turbo engines from the 70's on were aftercooled.Ĭummins truck block went thru many changes. What are the specs and ratings of these various Big Cams and what is their maximum hp/torque?Ĭ= "custom" rated (doesn't really mean much) I am correct in thinking that the NTA-prefix means that the engine is aftercooled? The NTC- has a centrifugal water pump? Are all BC2's NTC300's? Is the "350 cummins" the BC3 NTC350? What about the NTA855? I saw it rated at as much as 525 hp.
#BIG CAM 350 PDF#
pdf file from the library and read it but I am still confused.
The numbering system and ratings are confusing. I need some help understanding the Cummins Big Cam engines. By erich.vongeist - Sunday, Septem7:52 AM
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