Join Date: Mar 2006
Location: Rainier, Oregon
Feedback Score: 0 reviews
Re: big cam cummins over heat
You don't have to back the power down, just be sure the pump is set up right. If it has MVT and it is working right then you should not have a smoke problem. If no MVT then you will have to live with a certain amount of smoke at idle. To eliminate the smoke on these engines after turning them up over 400 hp, the timing has to be advanced at idle, but if it stays advanced under power, the engine life will suffer and could melt a piston. That is why the timing is set a bit retarded. whith the MVT this is not a problem, as The MVT advances the timing at idle, and retards it the rest of the time. Most if the Big Cam I II and III 400's smoked a little at idle because the timing was set to keep from melting pistons, but it was too retarded at idle to keep from smoking. That is why they came up with the MVT system. After they went to computer on the N-14 the computer would advance and retard the timing so it was not needed any more. One other thing, you are running in an over fuel condition at 444 hp. This will not hurt a thing, if you remember that. DO NOT lug it on a hard pull. you will build massive heat on the piston tops and eventually one or more will start cracking, usually dirctly over and in line with the piston pin. Which means it will split there and out goes the rod. I have seen a lot of pistons that the crack was there but had not broken all the way through. YET. It is a good engine, and will last a long time if you keep the cooling system clean and watch the Pyrometer climbing hills.
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