i am thinking of building a motor for my street truck, its a 97 12v with highly modded pump, hx40/ht3b twins, 370 injectors, mild port job, fass 280gph, bigger valve springs and more anyways thinking of doing a 24v with my p pump will this net me more air and more power or just a waste of time, i will be doing a cam and better injectors and better turbos also but i am feeling the 24v head with the injector spraying straight down on the piston is better than spraying in from the side not to mention the more injector choices for the 24v any help would be appreciated.

also what cam to go with
what turbos to go with
what injectors


thanks alot

 

hello, anybody

 

12v head flows better - stick with that.

Can't run a 24v head with a 12v piston anyway...the bowl on the 12v is offset to match the spray pattern of the injector. The 24v piston bowls are centered to match the 24v spray pattern.

 

stock for stock a 24v will flow more

 

i know a 12v piston wouldnt work with a 24v head i have built many diesels thats why i said p pump a 24v, i dont believe that the 12v will flow better the numbers show the 24v stock for stock is WAY better than a 12v.

 

teh 12v even though the bowl is offset still shoots in at an angle and not straight down thats what i am asking seems to me a straight down will atomize better and get a more even burn.

 

it would most likely be easier and cheaper to get a stage 3 port and polished 12v head... flows way more than a stock 24v head. you could take the time and money saved to buy a good cam, injectors and turbo(s). or am i missing something? if you look at power records, most of them are held by 12v trucks.

 

12v head introduces swirl in the intake air charge. 24v head ports don't give that. Power for power, the 12v head will yield lower EGT's.

12v is the better way to go.

 

Valvetrain is much cheaper for the 12v than the 24v, although prices on 24v stuff is coming down.

 

Not to mention items to stop the pedastals from rocking, springs to keep things in check, etc.

 

now were talking i was wanting to know the best, i really appreciate the help but if i go with the 24v head i would have it ported also so a stage 3 port for a 12v will get you more than a stock 24v so a stage 3 port on a 24v would be alot better right or wrong, again thanks for the help

 

There is a reason Cummins started using 24 valves,however we can debate 12 vs 24 all night. One main thing a 12v head has is cheap rpm....other than that I see no reason not to take advantage of the 24v injector placement and port design.JMO!!

 

understandable but the money spent IMO could be better utilized in other areas. the benifit is fairly small compared to the cost. im not sure what you are going for in your build but I would put the money in other things before a 24v head unless you have done everything else top of the line.

 

i am wanting a competable street truck, the guys areound here (Vannest) all run nothing but nitrous and alot of it, they run a 3/8" line NO PILL, they run good that way, i with my street truck am within 5 feet or so of them. I want to beat them straight fuel, i know a cam will help tremendously, and a good set of injectors, my 12v head has a decent port job on it. My buddy owns a performance shop and we have easy access to heads and stuff so that doesnt matter so much it will be cheap to do and he wants to try this route, i am liking the injector placement but not so much the bridges between the valves so i am taking all your opinions in. I will probably be switching to schwitzer turbos instead of the hx40/ht3b setup is that a good way to go also. I have not heard of any of you mention a good cam to run for street/competition. your help is appreciated.

 

I will b watching this post I have a hurt 12v(burning oil) and a good 24v out of a wrecked truck. I was also thinking about doing the p pump conversion to it.