Engine/Transmission (1994 - 1998) Cummins1942

[cummins1942]

Question: Can a 24v cylinder head be put on a 12v engine block and what would the problems be. The reason being I don't like the Bosh VP 44 It's to noisy and you have to maintain a minimum of 5 PSI fuel pressure or the pump will self destruct in seconds. The P7100 is a much better pump. I also don't like that the VP 44 its electronically controlled.

 

[DVolk]

The can is different lots of stuff so no

 

[BigPapa]

It can and has been done but, there are several major differences that will have to be dealt with such as injectors, injector lines, exhaust manifold, etc. A lot of work for very little if any power gain. Most high HP trucks running a 12V are running a modified or aftermarket 12V head.

In my opinion, not worth the effort.

 

[DieselRyan]

Going to have to agree with BigPapa. The 12v head flows more air and exhaust. you would have to change the injectors and fuel lines. Technically if you were to change it over, the tappets are different and push rodes from a 12v to a 24v.

 

[Destroked 450]

If your wanting to build a 24v using a 12v block, yes you can, 12v blocks have different threads for sensors so a adaptor is needed.
If you wanting to just swap a 24v head onto a 12v engine it's best to use 24v pistons, you may need to swap in a 24v cam but I not sure, if you can keep the 12v cam you can use 12v lifters but need 24v pushrods, you'll also need custom lines and have the 24v injectors set for 12v pop pressure.
Stock 24v head flows better than stock 12v, but with a little port work the 12v will surpass the 24v, there's also aftermarket 12v heads that will out flow highly modified 24v heads.
I checked into going with a 24v head while rebuilding my 12v and found the general opinion was it wasn't worth the cost.
Most of the conversions I'm seeing is guys with 24v trucks converting to 12v fuel systems.

 

[Shadrach]

On a 12v the piston bowl is offset because the injector points in at an angle and is on the outside of the head. On a 24v the piston bowl is in the center of the piston and the injector points straight down into this and it is under the valve cover. So while a 24v head can be made to work on a 12v engine the amount of work involved and the number of things that need to be changed are not wotrh it for most people. Now if you are building an engine from scratch that's a different story. Then you take the best from everything and build a HYBRID

David