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Cummins 855ci pistons?

290smallcam

Active member
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peru,indiana
Was looking at 14:1 comp. ratio pistons and they were the "newer" Tri Tech pistons for a Big Cam. Looking at my manuals for the NHC 250 and B.C.400, they have the same measurements. Can they be used in any motor? Can a B.C. piston be used in a small cam, and vise versa?
 

simp5782

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Was looking at 14:1 comp. ratio pistons and they were the "newer" Tri Tech pistons for a Big Cam. Looking at my manuals for the NHC 250 and B.C.400, they have the same measurements. Can they be used in any motor? Can a B.C. piston be used in a small cam, and vise versa?
 

WillWagner

The Person You Were Warned About As A Child
Super Moderator
Steel Soldiers Supporter
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Size of the piton is the same, 5 1/2 inch bore, it is the bowl design that makes a difference on the pistons. TriTech changed bowl design to accommodate the ring pack repositioning on the piston. 14:1 comp pistons along with the base timing...IIRC, .065, .067 or maybe .072....might make a mosquito repelling machine that won't clear up and black smoke when running down the road and maybe before the latter have reared their head, a no or hard start issue.

Take a look at videos that show cold starts on diesels. Those show what happens when the combustion temps are not up enough to lite it. They eventually clear up. Imagine that but in a climate that would normally support good combustion, but it won't clear up.
 

290smallcam

Active member
150
36
28
Location
peru,indiana
I know they made 400HP smallcams. Would anyone know what the timing was on those? If it's up in the 60-70's wouldn't the cam fit the NHC 250? If so installing the tri tech 14.1 or 14.5 piston would work???? Of course one would send the Pistons out to EMBEE coatings, to thermally coat the tops since there is no oil piston jets on NHC..
 

simp5782

Feo, Fuerte y Formal
Supporting Vendor
12,091
9,248
113
Location
Mason, TN
I know they made 400HP smallcams. Would anyone know what the timing was on those? If it's up in the 60-70's wouldn't the cam fit the NHC 250? If so installing the tri tech 14.1 or 14.5 piston would work???? Of course one would send the Pistons out to EMBEE coatings, to thermally coat the tops since there is no oil piston jets on NHC..
CPL 695 is the 400 magnum small cam motor. Cam code E. It used 14.0 Pistons that are used in cpl 531
 

WillWagner

The Person You Were Warned About As A Child
Super Moderator
Steel Soldiers Supporter
8,370
2,326
113
Location
Monrovia, Ca.
Again, it is not size, it is the bowl design. Yes, there was a 400 magnum, it was a small cam but it liked to eat camshafts. There was also a 440 magnum .It was step time controlled and ate cams faster than the 400. Keep in mind, what I had first hand knowledge on were used on OTR application, actually working the truck daily. What and how these are being used for, not the same, well except for Simp. High HP small cam wouldn't work reliably for what he is doing with his stuff
 

simp5782

Feo, Fuerte y Formal
Supporting Vendor
12,091
9,248
113
Location
Mason, TN
Again, it is not size, it is the bowl design. Yes, there was a 400 magnum, it was a small cam but it liked to eat camshafts. There was also a 440 magnum .It was step time controlled and ate cams faster than the 400. Keep in mind, what I had first hand knowledge on were used on OTR application, actually working the truck daily. What and how these are being used for, not the same, well except for Simp. High HP small cam wouldn't work reliably for what he is doing with his stuff
Why I acquired a truck with a KTA, the next saga begins
 

WillWagner

The Person You Were Warned About As A Child
Super Moderator
Steel Soldiers Supporter
8,370
2,326
113
Location
Monrovia, Ca.
Way cool! 450 or 600.......there was a 750 too. the saying goes, got a "K", gotta pay! Pics or it ain't real!
 
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