Ok, i am wondering what kind of internals(crank, rods, pistons) to build up a n/a 2.4 for turbo duty(20-30 psi of boost). i read somewhere that you use 2.5 turbo pistons, 2.2 turbo rods, 2.2 turbo rod bearings, and a 2.4 crank? could any one confirm this information? thanks.

 

Try this..........https://dodgeforum.com/m_320541/tm.htm

 

That post is for swapping an SRT-4 motor in, not swapping in a n/a 2.4L and then turbocharging it... Very different.

I know the 2.2/2.5L pistons were aluminum with steel struts. Not sure what the rods were, but I'm guessing they were cast, not forged. Floating wristpin. And I don't have the dimensions handy at the moment as far as rod length, bearing dimensions, etc.

It may very well have been done by someone, but even if they do fit, there's no way they are going to stand up to the HP numbers you are planning on. A quality set of forged pistons and rods is a very worthwhile investment for anyone doing forced induction of any type (including nitrous). The 2.4 bearings have held up very well in other serious buildups, so that shouldn't be an issue.

Best of luck!

 

Thats why I steered him in the right direction, its dirty, but it gives the right way to do things

 

no swap like that should ever be attempted IMO...It was done a lot with the turbo 1....to turbo 2 and turbo z 2.5 motors....A lot but thats b/c a lot of em were interchangeable...now for a 2.4 it is really pushin it if you think you will get it to work without any problems....boosting on a n/a motor can be done more successfully and has very low cost involved. Running 6 psi from a used junkyard turbo off an eclipse or talon or lazer then going and getting the turbo manifold custom made (flanges included) and a thicker headgasket along with up to 31 lb fuel injectors swap...and cheapo (junkyard) intercooler can get you there...in the 200 hp range. The thing you gotta watch for is connecting rods and pistons they are only good for so much torque.

BTW the common turbos were t25...g16 td05h and so-on w/ those... Do not try and bolt on any mazda/ford parts its better to stick with the familiars as they have less custom work involved. Good luck

 

How is swapping a stock/Stage 1 SRT-4 motor the "right way" to do things compared to a normal 2.4L buildup? He was specifically asking about doing:
- building up a regular 2.4L for a turbo
- 20-30 psi
- wanting to know if particular 2.2/2.5L parts were interchangeable.

You answered none of those questions by directing him to a SRT-4 swap...

At 20-30 psi, he's probably shooting for the 500-600 HP range. The stock SRT-4 rods are forged, but they aren't going to hold up as well as a nice set of JE pistons on Eagle rods at that power. The Mopar Stage 3 w/goodies is pushing it at 355 HP on race fuel (310 HP on pump gas). So if you're going to tear into the internals, why not do it on a $400 salvage yard run-of-the-mill 2.4L from a Caravan instead of a $1500+ harder-to-find SRT-4 motor?

I know some people are into the whole plug and play thing (not that the SRT-4 swap is exactly a bolt-on...). And it's always nice to know your options. But others like to start from scratch. No disrespect to Jake's awesome NYG SRT-4 of course. But for the money, a "regular" 2.4L turbo buildup still makes more sense at this point.