You are correct. A supercharger and a "blower" are basically the same thing. The supercharger on a Detroit doesn't increase the density of air in a cylinder as it would in most other applications. The supercharger on a Detroit engine is used to push exhaust air out of the cylinder and push clean air in. The engine will not run without one. A turbo is exhaust-driven.
So this is a 2-Cycle, I've heard of them before, but I've never seen them run. Do you have to rev them up real high to get any power? Is this one of the ones with a supercharger and a turbocharger?
The Detroit Diesel's rev about the same RPM's as any other diesel engine, but because there is a power stroke every stroke it "sounds" like they are revving faster. The Detroits do like more speed for power, but they lug too. All Detroit Diesel's have a supercharger, but this one has a turbo as well.
all detroit 2-strokes have a blower - not a supercharger. The difference being that a supercharger creates a boost pressure above ambient air pressure, and in the case of a detroit 2-stroke, the blower simply pushes the next air/fuel charge into the cylinder, thereby pushing the exhaust gases out the exhaust port at the same time. can't run a DD 2-stroke w/o blower. :)
Just a small nitpick: It's not an air/fuel charge being pushed into the cylinder. It's just an air charge, the fuel is injected at the appropriate time from the top of the cylinder, thus causing combustion (same as all diesels).
@dakotamcatee yes and no. The name differentiates the function they pose. A blower blows air. A supercharger "super charges" the air by producing boost. While on a 6v52, a blower is geared to provide enough air to scavenge and charge the piston with air, on a 4-stroke with the proper gearing, the blower becomes a supercharger, cramming more air into the engine than it could get on its own. Truth.
@dakotamcatee Anyone who calls a blower that produces boost a "blower" is using the wrong terminology, and anyone who calls a supercharger that doesn't produce boost a "supercharger" is also using the wrong terminology. Blowing no more air than the engine can produce on its own is not a power adder, but on the other hand a detroit 2-stroke will not run without one. Turbo detroits need a blower to get started, but once the turbo is spooling, they push enough air to keep running.
@dakotamcatee if the blower blows the same volume of air at a given rpm as what the engine would draw in without it, then yes- turning it faster will cause it to blow more air, which with enough of it becomes a pressure increase. Likewise, if you put a larger blower (that pushes more air at a given rpm) on the engine, the larger volume of air than the demand has the same effect.
@dakotamcatee like I said, yes and no... Which term is accurate depends on the application. A detroit 2-stroke with a roots blower is normally aspirated. A SBC350 without a roots blower is also normally aspirated. A Detroit with a turbo is turbocharged. A SBC350 with a roots blower is supercharged. A coke that's been sitting opens with a psht. A coke that's been shaken blows everywhere. Both are a coke, what differs is the volume of gas that's produced when shaken.
you're right... a diesel is VERY easy on gas... doesn't use any! :)
A 2 stroke will, on average, burn twice as much fuel at the same RPM for the same displacement... but it also puts twice as much power out ... roughly... :)
i only come accross the 2 stroke diesel v8s and v6s etc the other week. im fascinated. anyone have vids of the engine? i bet they are juicey on fuel arnt they. like what, 2 miles per gallon?
awsome, was the 1 who asked for more:) I am working hgard to try to get 1 of a race trcuk called, MAD DOG and its a v8 race truck, 2 stroke, revv up to 3500 its screams!
Someone asked for some more RPM's on a video of mine, so here you go. The tackometer stops at 2400, but it probably revved a couple hundred more RPM's. Youtube video compression did a number on the quality, but this is for the sound. Enjoy!
Pure singing.
maersklandro 8 months ago
ive got an old mechanial 350 cummins and it only gets 4 miles to the gallon
Dirtbikeracer250 3 years ago
nice one,what truck is that in ?
curnock 4 years ago
yea the whining of the blower sometimes can really wring the ears out when on a transit bus
veltpak6 4 years ago
yea espcially sinc etehre auto and the foots too teh floor most of teh time not like a maunal where u let off the gas for shift u do and down shift
DodgeRamit02 3 years ago
Same engine thats in my fire truck at work too!
rockfella8587 4 years ago
same engine thats in 47 foot mlb. Thats a coast guard life boat by the way.
acool83 4 years ago
did you mean turbocharger? i thought a supercharger and blower were the samething [belt or gear driven] while a turbo is exhast driven
truckr74 4 years ago
You are correct. A supercharger and a "blower" are basically the same thing. The supercharger on a Detroit doesn't increase the density of air in a cylinder as it would in most other applications. The supercharger on a Detroit engine is used to push exhaust air out of the cylinder and push clean air in. The engine will not run without one. A turbo is exhaust-driven.
linesplice 4 years ago
We just ran a jucied up 318 in a '71 brock and it hit about 5 miles to the gallon!
671Detroit 4 years ago
This engine gets about 8-10mpg running around 70mph
linesplice 4 years ago
So this is a 2-Cycle, I've heard of them before, but I've never seen them run. Do you have to rev them up real high to get any power? Is this one of the ones with a supercharger and a turbocharger?
ilikecars1 4 years ago
The Detroit Diesel's rev about the same RPM's as any other diesel engine, but because there is a power stroke every stroke it "sounds" like they are revving faster. The Detroits do like more speed for power, but they lug too. All Detroit Diesel's have a supercharger, but this one has a turbo as well.
linesplice 4 years ago
all detroit 2-strokes have a blower - not a supercharger. The difference being that a supercharger creates a boost pressure above ambient air pressure, and in the case of a detroit 2-stroke, the blower simply pushes the next air/fuel charge into the cylinder, thereby pushing the exhaust gases out the exhaust port at the same time. can't run a DD 2-stroke w/o blower. :)
lilbrudder32 4 years ago 4
Just a small nitpick: It's not an air/fuel charge being pushed into the cylinder. It's just an air charge, the fuel is injected at the appropriate time from the top of the cylinder, thus causing combustion (same as all diesels).
tmelgin1 3 years ago 3
@lilbrudder32 Blowers and superchargers are the same thing.
dakotamcatee 1 month ago
@dakotamcatee yes and no. The name differentiates the function they pose. A blower blows air. A supercharger "super charges" the air by producing boost. While on a 6v52, a blower is geared to provide enough air to scavenge and charge the piston with air, on a 4-stroke with the proper gearing, the blower becomes a supercharger, cramming more air into the engine than it could get on its own. Truth.
lilbrudder32 1 month ago
@dakotamcatee Anyone who calls a blower that produces boost a "blower" is using the wrong terminology, and anyone who calls a supercharger that doesn't produce boost a "supercharger" is also using the wrong terminology. Blowing no more air than the engine can produce on its own is not a power adder, but on the other hand a detroit 2-stroke will not run without one. Turbo detroits need a blower to get started, but once the turbo is spooling, they push enough air to keep running.
lilbrudder32 1 month ago
@lilbrudder32 So if you take a "blower" and make it turn faster and create boost it is then called a supercharger?
dakotamcatee 1 month ago
@dakotamcatee if the blower blows the same volume of air at a given rpm as what the engine would draw in without it, then yes- turning it faster will cause it to blow more air, which with enough of it becomes a pressure increase. Likewise, if you put a larger blower (that pushes more air at a given rpm) on the engine, the larger volume of air than the demand has the same effect.
lilbrudder32 1 month ago
@lilbrudder32 So they're the same thing then?
dakotamcatee 1 month ago
@dakotamcatee like I said, yes and no... Which term is accurate depends on the application. A detroit 2-stroke with a roots blower is normally aspirated. A SBC350 without a roots blower is also normally aspirated. A Detroit with a turbo is turbocharged. A SBC350 with a roots blower is supercharged. A coke that's been sitting opens with a psht. A coke that's been shaken blows everywhere. Both are a coke, what differs is the volume of gas that's produced when shaken.
lilbrudder32 1 month ago
I didn't think a 2-stroke diesel would be that hard on gas.
Boeing227 4 years ago
you're right... a diesel is VERY easy on gas... doesn't use any! :)
A 2 stroke will, on average, burn twice as much fuel at the same RPM for the same displacement... but it also puts twice as much power out ... roughly... :)
lilbrudder32 4 years ago 4
dont you even let them turbos spin down?
i only come accross the 2 stroke diesel v8s and v6s etc the other week. im fascinated. anyone have vids of the engine? i bet they are juicey on fuel arnt they. like what, 2 miles per gallon?
tonyppe 5 years ago
look on my favrits, "barraute 2005"i was there but some1 taped it, the white truck is a 2 stroke v8 race truck, its awsome
detroitPOWER 5 years ago
awsome, was the 1 who asked for more:) I am working hgard to try to get 1 of a race trcuk called, MAD DOG and its a v8 race truck, 2 stroke, revv up to 3500 its screams!
nice sound thought
detroitPOWER 5 years ago
Great! Post a good vid shoving the truck in motion, please! Just love those old Astro:s..
snaellast 5 years ago
Do a vid of a run through the gears next!
TechMaven 5 years ago
very nice! thanks for posting.
bigcarlover 5 years ago
awesome
wae 5 years ago
Someone asked for some more RPM's on a video of mine, so here you go. The tackometer stops at 2400, but it probably revved a couple hundred more RPM's. Youtube video compression did a number on the quality, but this is for the sound. Enjoy!
linesplice 5 years ago