If you are talking top fuel, rails, funny cars that sorta thing, superchargers are part of the ruleset, or at least used to be, that may have changed in the last 5 years (which is how old my book is).

In these particular classes they are launching off with 5000rpm or so, revving to 8000 then airshift.

With a 5000RPM launch, spoolup is a non issue, regardless of forced induction method (assuming things are sized right).

Whenever I see people drawing parallels between racing cars of this level and passenger vehicles that you and I would drive, I have to chime in.

I'm sure no one hear has clutched in at 5000rpm on their truck. At least not intentionally

 

Any of the huge-*** construction equipment. You know, dumptrucks with tires larger than your crewcab is long. Big cranes,even been iron boats and stuff.

 

I think 14-71 blowers go on top-fuel dragsters aswell.

 

Wanna supercharge a diesel? Cool. Just make sure you use an itty-bitty pully.

 

They don't get that joke here dude, it's not LS2

 

cummins made a supercharged v-6 diesel in the early sixties nick named the "iron lung" that was supercharged it has a giant aluminum supercharger and 3 valves a cylinder and made 300 hp and 750 ft lbs torque.

 

i haven't seen too many supercharged diesels.the ones that i HAVE seen used a doubled up timing chain for it's pulley as opposed to a belt.i would like to see some pictures of a couple of supercharged diesels here though.it might give a more realistic point of refference when it comes to a discussion like this.

 

OK. So now that super charger ideal I had with the dual striaght pipes is gone.

 

all of the old diesels were supercharged because they were 2-strokes....the superchargers dont induce the intake air....all it is there for is to push out teh exhaust and its coming back up for compression

 

A 4 stroke engine uses the "INTAKE" stroke to "INTAKE" air by creating a vacuum so the air gets pulled into the chamber.
A 2 stroke motorcycle uses the bottom of the piston in the crank (that is why you must premix the oil into the fuel to lube the crank as there is no oil sump there) area to pull the air in when the piston moves up on the intake/compression stroke.

A 2 stroke diesel has no intake stroke above the piston like a 4 stroke, or on the bottom of the piston like a 2 stroke motorcycle engine so you MUST use a positive displacement blower to push the air into the cylinder also pushing any remaining unexhausted exhaust with the incoming air.

The exhaust port opens just before the intake port opens so the high pressure starts going that way, and the incoming air is positive so it does help the exhaust go the path of least resistance rather than go both ways, so it would look like it pushes the exhaust out, but it just keeps the exhaust from going the wrong way.
Without a blower, a 2 stroke diesel will not run!

Go here
http://www.keveney.com/Engines.html
and see how 2 and 4 stroke engines run, but I dont know if there is a 2 stroke diesel there.

 

archangel do u have any idea what a 2-stroke diesel sleev looks like?...if ur right i guess all my training tobecome a diesel tech is a big waste of money...sh** i better go find a new carrer soon

 

The last two years I was in the Army I drove an M997 HEMTT.

<!--[if gte vml 1]><v:shapetype id="_x0000_t75" coordsize="21600,21600" o:spt="75" oreferrelative="t" path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f"> <v:stroke joinstyle="miter"/> <v:formulas> <v:f eqn="if lineDrawn pixelLineWidth 0"/> <v:f eqn="sum @0 1 0"/> <v:f eqn="sum 0 0 @1"/> <v:f eqn="prod @2 1 2"/> <v:f eqn="prod @3 21600 pixelWidth"/> <v:f eqn="prod @3 21600 pixelHeight"/> <v:f eqn="sum @0 0 1"/> <v:f eqn="prod @6 1 2"/> <v:f eqn="prod @7 21600 pixelWidth"/> <v:f eqn="sum @8 21600 0"/> <v:f eqn="prod @7 21600 pixelHeight"/> <v:f eqn="sum @10 21600 0"/> </v:formulas> <vath o:extrusionok="f" gradientshapeok="t" o:connecttype="rect"/> <o:lock v:ext="edit" aspectratio="t"/> </v:shapetype><v:shape id="_x0000_i1025" type="#_x0000_t75" alt="" style='width:182.25pt; height5.25pt'> <v:imagedata src="file:///C:TEMPmsohtml1\01clip_image001.jpg" o:href="http://usmilitary.about.com/library/milinfo/arfacts/m977.jpg"/> </v:shape><![endif]--><!--[if !vml]-->

<!--[endif]-->They are 2 stroke turbo diesels with a re-circulating oil system. I don't remember a blower on them. I may have missed it.

They are powerful though. (Make sure my captain doesn’t see this) They can reach 60-65 MPH on the open highway with a full load. The engine is right behind the cab, over the front axels. These things are monsters. If you get one stuck it is stuck!

 

No wait, those had exhaust valves and intake ports where the blower blew the air in.
I was thinking of an aviation two stroke V6 I tore into once.

Sorry, it's been a few decades since I had one open, hell a couple decades since I even drove or seen one, either way, I know they will not run without a blower, and if you are working on them, you must work for a freaking truck museum.

There is nothing else that sounds like a screaming 2 stroke Detroit!

They are so out of date, any school that feels the need to devote much time to them are way behind the times and should be focusing on more modern engines.

Saw one once with a blower and turbo's combined!
And both two V6's and two V8's made into a V12 and V16!

 

we had 3 detroits at my school one v6 and 2 v8's ...then about 50 others mixed of cummins detroit 60s. cat and int......then we had a show striaght 16 quad turbo that went on a boat..