6-71 blower

[original balzer]

Just out of curiosity has anyone tried any kind of supercharger on a 6.X engine? I was BS'n with my cousin the other day about my 6.2 when he said "hey why dont we put that blower I gave you on your diesel" its the blower off a 6-71 detroit witch would require a drive system and a custom intake. Doable but still not very cheap.

And while we are on the subject some old detroits had BOTH a blower and a turbo. How does that work? Would it be simular to a compound twin turbo?

This isnt realy something I would consiter, just more for discussion than anything. The reason I say this is just simply because I have looked up the chit needed just for the belt drive system and its big $$$. And I dont know anyone personaly that can build an intake for it.

EDIT: Maxpf posted this in another thread and it lists a supercharged version of the 6.5
http://www.amgeneral.com/vehicles_gep_productinfo.php

 

[ryoken]

Aot of the Detroits I work on are twin turbo and supercharged...

 

[original balzer]

How does that work Ryoken? The blowers are RPM specific to the amount of air that gets in arent they? I know my freebie 6-71 dont appear that air would get past it if it wasnt turning. (I know if the engine is running it would be turning) But the speed of the vains seams to limit the amount of air going in or would it? I dont know much about blowers or turbos obviously.

To try to say it differntly, if the blower was putting out say 12lbs boost and the trubos put out more boost how would the turbo boost get past the blower? I mean I know the blowers gunna suck in the boost from the turbo but wouldnt it come out the same because the speed of the blower vains?

BLAH! I dont know how to splain what Im thinking.

 

[uao85]

How does that work Ryoken? The blowers are RPM specific to the amount of air that gets in arent they? I know my freebie 6-71 dont appear that air would get past it if it wasnt turning. (I know if the engine is running it would be turning) But the speed of the vains seams to limit the amount of air going in or would it? I dont know much about blowers or turbos obviously.

To try to say it differntly, if the blower was putting out say 12lbs boost and the trubos put out more boost how would the turbo boost get past the blower? I mean I know the blowers gunna suck in the boost from the turbo but wouldnt it come out the same because the speed of the blower vains?

BLAH! I dont know how to splain what Im thinking.

I think the 12 lbs refers to pressure, not vollume. Pressure is like saying density as well for another comparison. 12 lbs just refers to the density or pressure of the air, not the vollume. Like propane, you let it out of the tank or a grill, its gas, but compressed its much more dense while still in the tank.


Remington

 

[ryoken]

I think the key is matching the boost of the blower and turbo's...

Cat has em too....

 

[MaxPF]

Two stroke diesels liek the 6-71 HAVE to have a blower - they simply will not run without one. On a 2 stroke diesel the blower is literally a blower, not a supercharger. As the piston approaches BDC the exhaust valves in the head open, and the piston uncovers the intake ports in the cylinder. The blower blows fresh air into the cylinder while forcing the remaining exhaust gases out. Without the blower the engine wouldn't get a fresh air charge. However, the blower doesn't actually pressurize the air in the cylinder - is is still essentially a naturally aspirated engine. When you add a turbo you increase the amount of air blown into the cylinder, just like on a 4 stroke.

 

[DEMON44]

2 strokes will run without a blower, albeit not real well. But you will never ever start one without the blower. I've had a 6v-92 backfire then run backwards in a truck and use reverse to pull it into the shop. that was a good day and had to diagnose a 4-53 in a packer with a no start condition.......blower shaft sheared. They ran it all day the day before at WOT clearly never heard anything , parked it then it no started the next day........

anyway that being said, all 2 strokes have a blower but are considered naturally aspirated until hung with a turbocharger.

balzer you're on the right track.
the blowers that are used with turbo chargers have a bypass valve in the end plate that the N/A blowers do not have. Its boost referenced, so when the turbo hits a predetermined pressure it just pushes past the blower as well as through it.

I've got 3 6-71 blowers in my garage too. I sold off the 8v-71 I never should of got rid of that one.



What Cat has a blower? I've never heard of that. The Accert engines have twin compound turbos though.

 

[DEMON44]

Like this, you see the small silver cylinder at the front top of the blower about the size of a film canister with the 1/4" line going off the away side? thats the sping canister the hose is boost reference

this is a c15 accert Cat compound twins just like the little motor in my Dodge.