Maxthe7man

There was another discussion and some questions on this in another thread in another section, I found a good pic of a compound set up, so I though I would share it...
This is a cummins "b" series engine from the dodge pickups, 5.9 litres straight six diesels..
I have been doing some research on these setups, as I am thinking about converting my 440 truck to a cummins b or c 8.3 litre..
Some things I have stumbled across, setups like this are running 80 psi + on the street, notice the rod end links holding the piping together, neat idea for those trouble some hoses and stops the "hump" hose connectors from ballooning..A few of the guys running these setups drag race these trucks and are dyno'ing 600-800 hp with torque #'s ranging from 1200-1600 ft/lbs, amazing.. watching videos, and checking their timeslips, theres full size trucks running 9's, and lightened trucks turning 8's...scary...just though I would share..

MFilippello

iTrader: (2)

now we're talking. An alternative to the rotory and ls1 motors for our cars. Straight six, 80psi, diesel. don't have to worry about detonation cause they run on detonation. Who cares if it's a little on the heavy side. with 1200 ft lbs of torque, it won't matter.

Actually this is pretty cool stuff. When I was at SEMA, there was a tripple turbo diesel dragster. I forgot what kind of numbers it put down but it was pretty impressive.

Max, this would only work on diesels I imagine. Too much boost for regular motors to handle. It only makes since if your trying to get over 40 psi I would think also. These boost levels are great for diesels.

Maxthe7man

Yeah, not to much out there for fuel that would could reall use compound turbocharging, maybe tolulene or methanol at its limits..
Yeah, reading some guys pages on those setups is hilarious, life for them starts at 30 psi and goes up from there.. Nothing like having a 100 psi boost guage......
I really like the construction technique used on that setup in the pic...Max

2Lucky2tha7

iTrader: (3)

Interesting.....

bingoboy

why does it look like the 2 turbos are sucking each other?

bingoboy

hehe never mind, its like an optical illusion. i thought the 2 turbo inlets were connected with that piece of piping.

PropDue

Series setups work extemely well for diesels. You get the best of both size turbos, with no transition issues, as both turbos continuously work. Small turbo response and large turbo top end with a huge area under the curve. These setups work so well in fact, that I believe it is BW 3K that now has a series sequential available as a factory turbo for truck engine manufacturers.

Also, diesels never run on detonation. Positive controlled combustion is how they run... Add too much propane for fumagation and, you can get detonation, however...

jreynish

iTrader: (2)

that is exactly how I imagined to build my setup when I get the money to try i out. nice find Max.

BlaCkPlaGUE

I don't understand it, is that twin turboed?

I saw a neat thing about this new honda engine. It was some environmentally friendly pos, but the concept was really neat. It had direct cylinder injection, just like a diesel. So air would go in, only air, into the cylinder and get compressed much higher than a regular engine. The compression ratio was like 25:1 or some crazy ****. At TDC it would inject fuel and spark it off. Kinda neat. Kinda eliminates detonation if you think about it.

Tierce

holy crapple that sounds like it would require some crazy high fuel pressure. i mean if you use bar as 1 atm, and you compress that to 25 times normalized pressure, thats means you'd need a similar like 25bar fuel pressure which is what like 375psi?

RacerXtreme7

iTrader: (2)

Some diesels inject fuel at over 2000 psi. Nothing new here.

Mitsubishi has had direct fuel injected gasoline enines for years IN production, but are sold in cars over seas and not here in the states. These motors tend to be small in displacement and fuel effiencient, not something most SUV driving Americans are intersted in. There is some rumors of offering a bigger version of this engine (direct gasoline injected) as an option in the 2006-7 Lancer/EVO.

That pic for those who don't get it, is compound turbo charging.... in other words.... one turbo compresses air to say 30 psi, this compressed air is then feed to another turbo's inlet were it takes this 30 psi air and compresses it another 30 psi, result...... 60 psi of boost going into the intake of the engine. This is the simplified version of explaining it. A cintrifugal compressor doesn't care what pressure the air is entering it. Its set up to compress at a certain ratio (what ever its wastgated for). So if its set to compress 30 psi, and you feed in 30 psi, you get 60 out.

Running this type of set up is really only applicable for diesel engines. Even ubber high output drag only cars are typically30~40 psi of boost range and a single compressor works fine at those pressure ratios. So before theres goofey questions or ideas of doing this to a rotary, for get it..LOL....

~Mike.............

BlaCkPlaGUE

I think the diesels can handle it becuase of the direct cylinder injection, just becuase you can inject the fuel when you want it to combust. You don't have to worry about pre-ignition at all, so in that case, you can run as high a psi as you want. As much as the actual manifold and piston rings can take.

setzep

My neighbor has one of those 5.9's in his truck, he claims the engine alone weighs 1000#'s. It's also one of the loudest engines I've ever herd (not comming from the exhaust) but I guess it can pull a house down.

PropDue

Yes, they are about 1100 lbs dry.

Maxthe7man

Yeah they make pretty good power, IIRC the newest dodge (05) is rated at 325 hp and 600 ft/lbs right off the showroom floor..I remember when the first cummins truck rolled out in 88, and everyone was doing tests on them for mags etc etc, and it was the first truck ever tested to put down more power to the rear wheels than it was rated it at, at the time, I think it was 4wheeler magazine, that had a teste where it belted out 230 hp and 450 ft/lbs at the rear wheels or something like that..
I am trying to find an 8.3 litre cummins for a project if anyone sees one for sale, lem know, thanks..max