crate engines

[JOSHT]

Does any one know what the deal is on crate engines. I know I would not mind having the 5.9L 380h.p., but i do have to pass emissions and i was informed by the local dealership that they would not pass. When i contacted a company in New Jersey and another in Georgia they both told me as long as you have a cat. and use a throttle body it should be no problem. Also just kind of a dumb question, what would happen if you put 2 catalitic converters one right after another. would the second one not do anything? like i said that is a stupid question but just wondering. another dumb question(are you guys gonna kick my butt for these) i know you can twin turbo an engine, but what about s/c and turbo charging on the same engine. would the s/c not work because of the turbo? sorry for waisting your guyes time, but i was just wondering about that.

[jk_allen]

I'd think the Magnum 380 would be borderline in emissions passing, but only with F/I and cats. Carburated with no cats I don't think it'd stand a prayer. If you have to pass a visual, the engine would have to look fairly close to stock, and with fuel injection it should.

As far as 2 cats one right after another, there are cars that do it (a ZLEV honda if I remember), but the cats are specifically designed to do it. The problem would be I'd think to have enough heat to fire a second conventional cat. Most times systems like you are talking have one cat right off of the exhaust manifold, and then one in the normal spot. If you were to go with the Magnum 380, your best bet would be dual cats, one off of each bank of cylinders and true duals with a crossover.

As far as Turbo and Super charging, I don't think that'd work well. One or the other would feed the intake of the other one, and they are both designed to take air at atmospheric pressure and pressurize it. Don't think they would do real well as far as further pressurizing already pressurized air.

[DodgeMan79]

Not to step an any toes or start anything. But isn't the point of twin turbo's to increase the pressure twice on the air going into the engine? The first one gets the air moving and the second gives it a little more.

If I remember correctly on twin turbo Cummins they use two different size turbo's. One is smaller and can spool up faster. While the bigger one takes longer to spool up. So that by the time the bigger one is getting up to speed the smaller one is running good and the larger one has less work to do on pulling in air. So it makes it' easier for the larger turbo to produce it's max boost and operate more effeciantly.

[mikael]

Hey Don't know if you are aware or not. But the 380hp 5.9L Magnum Create engine is not the same as that Magnum motor siting in your truck.

If anyone would like to argue the point, I suggess you buy or look at a book Mopar part # 4876668 "Magnum Engines." It specifies that these are two different engines and basically parts cannot be swapped between them.

It's sorta like the Old Chevy V8s and the Gen II.

In saying this, and I have not spent a bunch of time in the book, I don't think you can put the MPI manifolds on the Create Magnum wiyh out major reworking of the intake bolt holes. The Create Magnum's Bolt holes are machined at a different angle.

mikael
ASE Master Tech
Chrysler Gold Tool Awards
CPT Ford MotoCo Awards

[Tumbleweed]

The twin turbo set up helps eliminate the turbo lag that was so noticeable in the single big turbos. The single big turbos with the big boost would almost have a neck ripping lag. The smaller turbo spooling quicker eliminates the lag while the big one is spooling. They've been doing this in big rigs for awhile now. You can watch the boost gauge go to 15 and then the transitions to 30+ is smoother without the sudden surge. Of course that was kinda cool to feel that, kind of like a delayed launch.
Of course it wasn't too comfortable, I remember getting a mild whiplash in a friend of mines porche.

[jk_allen]

I guess I always thought that a twin turbo setup just uses 2 identical smaller turbos that compress 2 different air-streams that converge at the intake manifold. This allows the turbos to spool up quicker for better performance off the line.

Guess I was wrong.

[Tumbleweed]

No that's not wrong. I was mainly refering to the diesel and single systems. The twin you're refering to does that, though that would still have a lag, but with the imbalance of sides probably not as noticeable. I've never been in a twin turbo so I don't know from experience, though I'd like to. But in the big trucks and the few cars that I've been in with big boost turbo's the lag was very noticeable and annoying if you're a passenger and not controlling it. Imagine trying to read or sleep while someone is driving aggresively. In the performance level I guess, lag means loss of time. As a passenger, after a while it just makes you want to slap someone. Maybe I'm just getting old...
With the smaller one inline you don't loose power, it's just sooo much smoother.

[DocsSST]

in the mopar catalog it says those engines are not for use with factory mpi installs and not for use with air conditioning. the intake manifold that comes on the engine has bosses for mpi conversions. the 2 bbl intake should bolt on, but i dont think you would produce the numbers they got by using the 4 bbl intake, holley 750 carb and 1 7/8 headers. plus i think you would have to change the oil pan and pick up tube.

[DodgeMan79]

Glad to see we all got our ideas across with out any problems. I hope JOSHT
got the anser or help he was looking for.