Engine/Transmission (1998.5 - 2002) 24v pistons in 12v

[KKunz]

I have a 96 12v that I’m building I’m wanting to know are the pistons in a 12v different than what in a 24v? I have a brand new set of Cummins pistons that are for a 24v and I’m wanting to know if I can us them in my 12v

 

[BigIronRam]

As I understand it, the pistons are different because of the position of the injector. Your 12 valve has an "angled" injector position vs. the 24 valve "centered" position. I'd try to trade for the correct pistons if I were you.



Robert

 

[Gary - K7GLD]

I sorta doubt it - the valve/injector configuration differs between the 2 engine types - and thus the critical fuel spray pattern...

 

[Gary - K7GLD]

DANG it Robert - you type faster than I do!

 

[Mundgyver]

If you are looking for more HP and TQ, maybe you would want to look at a set of Marine pistons along with the Marine injector set for that particular engine as supplied by Cummins. Pistons are generally sorted and matched for these engines as I understand it and the Marine applications produce more HP and TQ in stock form. Food for thought here, I am sure there is someone that can provide further knowledge on this line of thinking.

 

[Partyat33]

The pistons are quite different. The bowl is offset on a 12 valve.

 

[justinp20012500]

What type of 24v pistons do you have?? I maybe interested...

What size, brand, and year they fit???

 

[KKunz]

I guess I will have to get 12v pistons I’m not looking for high performance in this engine Just a good runner believe it or not the 12v is going in my 74 cj5 I have a bunch of parts from the 96 it came out of it will be a while before I’m done but it should be pretty cool when I get there. The 24v pistons are 0. 5 over bore I’m pretty sure there Cummins brand pistons but I’m not 100% sure. Where is the best place to get new pistons for the 12v

Kris

 

[Mundgyver]

Where is the best place to get new pistons for the 12v



I would just go to Cummins. That way you know that you have the right parts.

 

[JCutter]

Still kind of curious about the marine engine. I believe at stock it is 380hp and a b-series engine. Would it bolt up in my 01

 

[Mundgyver]

The problem with the Marine Engine (if it is a problem) is that Cummins does not want it put into a truck. Reason is emission. Old govy would probably hammer on them. The next problem you might have would be with the ECM. I can see ordering the Marine pistions and injectors along with other hardware as necessary to rebuild a engine out of a truck. I think you would benifit in the HP and TQ as the block is the same basic block. There is definetly more to this than just slamming things together though. I know of only one time this has been done here in Portland and Cummins Northwest was not happy about it at all. My understanding is that they sold the engine as a boat engine and it was put into a truck which goes against what Uncle Sam mandates.

 

[RustyJC]

What allowed the marine engine to operate at such high ratings was the availability of an infinite cooling source. By having the water in which the boat operated available (through shell and tube coolers) to cool the engine's coolant, oil and charge air, the marine BHP ratings could be maintained without engine damage. Obviously, the truck's cooling limitations will restrict the output of the marine engine.



Rusty

 

[Bob4x4]

If you dig through the literature there is still a duty cycle for max load on Marine engines,at max hp.



Bob

 

[Partyat33]

Just a thought, when I was buying 24 V pistons and rings it was actually much cheaper to get them separate. Also get then from a distributor, not Cummins directly, its also cheaper. Good luck

 

[Joseph Donnelly]

I built up the new engine in Ol' Sickly with the 370 hp marine pistons, baffled oil pan, and block stiffener plate. You just have to be careful to integrate the various things like injector spray pattern, timing, injection pump flow, and governor to achieve an optimized, driveable package.

 

[Mundgyver]

There you go, the voice of the pro. I new someone had done this Oo. Oo.

 

[JCutter]

I thought it could be done but just didnt know quite how.