24v head on a 12v?

[BigUgly]

Guys;

Just wondering. Are there any problems with swaping a 24 valve head onto a 12 valve, besides the re-routing of the injector lines?

Josiah

 

[Speedo]

12v/24v swap

I would guess that you would have to change pistons too. That

would be because of the change in injector location (centered vs.

offset) and the combustion chamber is in the top of the piston.

That would mean your spray pattern would not hit the chamber

where its supposed to.

 

[LSMITH]

Pistons need to be changed and a complete injection line set custom made. The intake manifolds and exhuast manifolds are different. Air horns are different. That is all I can think of, but seems to be enough to make you want to buy a 24V donor engine to part out.

 

[JIM S.]

I dont see why the pistons would have to be changed... . the chamber in the top of the piston is in the center..... the 12 valve injector tips are made to spray flat even though they are angled... . call diesel dynamics... . they do conversions, because what do I know!

Jim

 

[WKener]

Well, are we overlooking the fact that your camshaft is driving 12 valves, and you are attempting to switch to a head with 2 more valves per cylinder, without the ability to open or close those 12 extra valves??

If I am missing something, let me know

 

[LSMITH]

The 24V only uses 12 pushrods, the rockers are bridged to handle the extra 12 valves.



The piston not being changed for the reasons mentioned above make sense to me too.

 

[LarryB]

Originally posted by JIM S.

I dont see why the pistons would have to be changed... . the chamber in the top of the piston is in the center..... the 12 valve injector tips are made to spray flat even though they are angled... .

I would guess that is why the injectors are keyed in the hole, so the spray in the right direction.

 

[BigUgly]

Thanks for the help fellas.

So it would appear that other than the injector routing, the main question is the pistons? I know the cam isn't a problem, I've seen a 12 valve that ran a 24 valve cam in it.

Josiah

 

[DavidTD]

The pistons need to be changed. The 24v piston has the chamber in the center of the piston. The 12v piston is located off-center. My guess is that if you didn't change the pistons, you would not be taking full advantage of the head.



From the looks of it, other than that it is purely bolt on. Then you need injection lines from the P7100 to the 24v head location.