Need help with supercharging a 6.2

[y5mgisi]

And when i think about the SuperTurbos, I think about this thing!

 

[y5mgisi]

Also look at this pic as i pad up your thread,

 

[Richcz28]

Ooooooo that's pretty. Is that a boat engine?

The super turbo that is

 

[DEMON44]

You can't compare a 2 stroke with a 4 stroke. The blower on a 2 stroke is a scavenge pump, its not a super charger. That's apples and oranges to what we're talking about compounding a 4 stroke diesel.

 

[y5mgisi]

Bagh, Oranges may not be the same as apples but they are still tasty!

 

[y5mgisi]

Ooooooo that's pretty. Is that a boat engine?

The super turbo that is

I havent the slightest but i think they put them in big rigs of the 60's-70's.

 

[DEMON44]

Detroit 2 strokes....... dinosaurs. they were in everything....... I mean everything, at one point. The second world war was won on the backs on Detroits in all the american machines. Trucks, Tanks, boats, you name it.

 

[DEMON44]

Bagh, Oranges may not be the same as apples but they are still tasty!

might be tasty...... but not applicable to the conversation.

2 strokes won't run without a scavenge pump blowing into the airbox.

 

[BadDog]

So if I put 2lbs into the TC Via the SC I'd get 2lbs outta the TC for a total of 4lbs? Or would the friction loss of the SC boost blowing through the TC be to much to leave any boost for the engine?
Yea I wish I could do a roots style, but trying to fab up a manifold to support one doesn't look so appealing. I thought about going bigger on the drive pulley but to get where I want to be I'd be looking at a 15" crank pulley, I defiantly don't have room for that. I'm looking into getting a 6.5 manifold and modifying it to move the turbo forward more or if I could fit twins somehow.

No, if you put 2 lbs in, and then pipe the intake side back into the same plenum as the SC, you can gain nothing at all because the intake is fighting the SCs existing 2 lb pressure, and you've added in more parasitic losses for a net loss. The only way compound makes sense is as shown in Y5's posted image. They way they work in combo is by providing pressurized input on the INTAKE side of the turbo to help avoid turbo lag. Once the trubo spools, the intake side inlet pressure goes negative when it overtakes the SC (usually configured to work best/well only at low rpm) and the valve allows open air so the trubo can take over all pressurizing duties.

 

[Mr. Sharky]

Yeah for $5600 for parts only and then machining and labor even if you do it all, too much for me.

I have been following the thread for awhile. I built my own turbo setup using a turbo from a V8 International Diesel engine out of a bus. I have not installed it yet. But I have all the components. I plan to do the install in August.

I always wondered about a supercharger setup. But when I looked at the price of that kit, I about peed on myself. I don't think that I have that much in my Blazer the way it sits right now.

I will let you know how it runs after the install.....

 

[DEMON44]

Yep, what he said.

A turbo will boost through its designed compressor map. Always. If you supply atmospheric pressure to the inlet, you will get output according to the map. If you supply 20psi to the inlet, your map applies starting at 20. And so on.


Side bar note. This is where the term intercooler applies. When you put a cooler between stages of boost.

Personal pet peeve. The cooler on the front of pickup trucks are NOT intercoolers. It's a charge air cooler.

 

[BadDog]

It's like "billet aluminum" and "aircraft aluminum"; or my all time favorite, "billet aircraft aluminum". I just gave up.

 

[Orange Bomber]

Baddog, I hadn't thought about the boost pressure fighting each other.

Mr.sharky, Definatly keep us posted on how that detroit diesel turbo works. What is the part number on your turbo? The local junior collage has a pile of detroit diesel engines just sitting around doing a whole lotta nothing.

Funny thing happened today, after my buddy was trying to show off doing boosted launchs in his superduty, I thought I would show him whats what and do my own boosted launch. I drop the clutch and when I look behind me, all I see is my buddy running up behind holding my SC belt, laughing his a** off. It was a little embaressing.

 

[y5mgisi]

Bagh! Ford owners anyway!