400 HP possible?

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PanGasket

PanGasket

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My plan is to do a 3 cylinder per turbo approach with cusom fabricated intake and exhaust on an EFI. I was thinking of using Wiseco 3.425" bore forged pistons and a set of K1 4340 H-Beam Billet connecting rods. is this a reasonable build? And no, I do not plan on putting nitrous in this car. So, yeah.
 
225 Slant six. By what I said, I meant like 3 cylinders per each turbo. like each turbo handles 3 of the cylinders exhausts and forced induction.


Its gonna be in a 2 door dart swinger
 
What is the center to center length on the K1 rods? Are the pistons for a slant or are they meant for a 2.2L 4 cylinder? Never much cared for turbos myself. They take too long to start making power. Your idea should work if you can find turbos small enough. They will only need to boost 1.85L each. 10-15 pounds of boost will get the power you are looking for with no problem and the slant will take that all day. When I get tired of my current setup a small Rootes blower will take it's place, so I'm with ya on this. 8)
 
They are stock 225 length. 7.005. they are meant for the slant. they are forged flat pistons by Wiseco
 
I'd go megasquirt good opportunity to build it yourself and learn/understand all of it's functions.. relatively cheap too.
 
DarTT said:
My plan is to do a 3 cylinder per turbo approach with cusom fabricated intake and exhaust on an EFI. I was thinking of using Wiseco 3.425" bore forged pistons and a set of K1 4340 H-Beam Billet connecting rods. is this a reasonable build? And no, I do not plan on putting nitrous in this car. So, yeah.
Click to expand...

400 hp would be very easily achieved in this context.
I have no doubt. Have tyou seen some of the 6s running around out there?
 
@Nick M: Thanks for the suggestion. =D. Ive heard quite a bit of chatter about the megasquirt efi system. I know its a good system to run 10 lbs of boost or less on. But what if I decide I wann go for 15lbs of boost or 12.5?


@Dakota: I've seen some, I saw one a while back with a Garrett T4 style GT440R turbo on a pull through setup on an IC. If I am correct, it ran a low 10.
 
I don't recommend the Wiesco/K-1 rod combo, unless you have had a lot of turbo experience. That rod and piston combo will give you over 10-1 CR with a 225 crank. The rod at 7.001 is the 198 length, which puts the piston up higher in the cyl.

Grump, if the turbo is properly sized for the engine, lag is mostly non existant. My old turbo slant, which is totally obsolete by todays standards, would get 2 lbs on the starting line, and 12 lbs at the tree. There are several slants making over 400 hp, one at over 600 in a street driver on pump gas.
 
So, what pistons and rods should I use? Would the wiseco's still be good? I havent really heard anything bad about wiseco pistons.


And arent the rods just .002" longer than the stock rods?
The 198 engine has the longest rod with a center-to-center distance of 7.006" and is PN 2951262. The 225 rod (PN 2406657) has a center-to-center distance of 6.699".
Came off slant-6.org
 
Stock 225 rods are 6.7 inches long. The K1 rods are 7 inches long. That's a difference of over a quarter of an inch which will put the top if the piston above the deck surface. Have to agree with you on Wiseco pistons though. Good pistons and great service. Try their 2.2 Turbo pistons if you want to use the K1 rods. You'll have to do a little more boring than you planned on but the block will take it.
 
Keep us posted on what setup you end up with and how it runs, I have a 225 dart and I've been looking at V8's cause of the power potential, but if you can get 400HP in a slant and still have it running off pump gas and use it on more then just the weekends, I might just bring that slant into the 21st century.
 
I had a set of forged Wiseco's made to fit the K1 rod. S/b around 8:1 comp ratio. 1.455 comp height. Part # ASC-01148

It is really a duplicate of a stock piston with the comp distance moved to accomodate the 7" K1 rod.



2693791825_f607a4cc8c_b.jpg
 
that is very nice, how much did the whole set cost, pins and all?

still, lower piston rings as well will also help to decrease chances of detonation (knock)
 
Very nice, I think I found my piston-rod combo. Thanks Shaker! Do they run really well? and how much is your slant making?
 
I'm guessing you are or were running a single turbo setup?


@HIR: Ill sure be running it on more than weekends, more than likely every other day and itll def be pump gas. Im mostly gonna hand-fab quite a bit of parts. =]
 
The megasquirt can be orderd/built using a 2 bar map sensor, high boost levels should not be a problem with this system. I was planning to use it on an SVO mustang i had, never got the chance though. Seem to remember a lot of guys over on the turboford site running megasquirt good info there.
 
*bump* anyone have any other piston/rod combos?


I aim to get a pre-76(?) 225 with the forged crank, thats correct right? or is it pre-72?
 
Well DarTT, it's always bothered me that with all the displacement the old mopar engines have, they make such little HP compared to the new engines. I have zero turbo experience, but if I can have my daily driver putting down anything over 350 HP with my original /6 under the hood, I'm ready to follow in your footsteps. Like I said, just keep me posted.
 
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