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why no supercharged diesels??

y5mgisi said:
you tube it!

Pretty sure this one is a super/turbo. Where the turbo shoves air down the throat of the super charger!

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yep but thats a 2-stroke, it needs a blower to operate. its not an add on. the factory also did this on 4-53t's and 6v92ta. blower to operate, and turbo to produce power.

12v71s like that truck are badass. very cool sound, good power, and they wind up alot further than say an 855 cummins.

the best is an open piped 6v92ta. slam your hand in the door, then drive it pissed off.
 
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and hang on. I don't mean root blowers are ideal to compound with. a centrifugal would be much better.


and in the 2 stroke Detroits the turbo does not compound with the blower. most blowers have an unloader that allows the turbo to blow through the blower into the airbox.

this is an 8v92. you can see the small film canister looking thing at the front of the blower. thats the blower bypass valve.

Turbo_blower-1.JPG
 
that truck rocks. i love that thing. no turbos though. its a regular 6v92. which i like better cause they are loud as f##k. the turbo really quiets them down.
the ta engines where more popular in buses and stuff a little later like 78' to maybe 84'. whenever they quit putting them for otr trucks.
 
and you right about the blowers, each of the blowers in a Detroit 149 take 250-300hp to turn at full load.

heres the pair of blowers out of a 16v149, they weight about 150lbs each as well.

IMG00458-20090918-1406.jpg



those blowers in in the bottom of the V under a valley plate under the aftercoolers.


this is a 2 stroke 12v149 Detroit at full load. its making 1.2 Mega watts on the business end, and about 1800hp in the engine.

 
all boat stuff? or do they make generators like that? im clueless bout the boat stuff.


edit. i meant that big?
 
sure lots in power generation. just as many in power units in the oil field. 2250hp 16v149 Detroits were the original horsepower on Frac trailers. then cat and cummins came in to it. I'm sure theres lots in tugs too, cause theres a marine application as well. though I've never see one on the prairies or in the Rockies in Alberta though :whistle: And theres alot of them in the older 250-350 ton rock trucks in the pit mines up north.
 
yeah, I occassionly see the 16v149's in boats, but usually it's the 12 or smaller versions...
 
DEMON44 said:
and hang on. I don't mean root blowers are ideal to compound with. a centrifugal would be much better.


and in the 2 stroke Detroits the turbo does not compound with the blower. most blowers have an unloader that allows the turbo to blow through the blower into the airbox.

this is an 8v92. you can see the small film canister looking thing at the front of the blower. thats the blower bypass valve.

Turbo_blower-1.JPG
Click to expand...

Bypass blowers didn't come along till the 2 stroke Detroits were nearing the end, most of the 2 strokes were built without the bypass blowers.

Gus
 
funny finding this thread, I have a GMC 671 just begging to get on my 6.2 and have been thinking about it.
 
38377k5 said:
It's been talked about a little already but turbos are considerably more efficient than superchargers. The downfall is that turbochargers typically have a limited RPM range that they work in (i.e. they only produce substantial pressure for a limited range) but on a diesel that only sees ~2000 RPM of usable RPM (say, 1000-3000 RPM) a turbo is a great fit.

This is why you see twin turbos in some vehicles (many have one that creates boost at low RPM and one at high RPM) and why turbos in new vehicles often use variable vane turbos, to make boost at low and high RPM's.

Honestly, turbo technology has become good enough that superchargers are somewhat becoming a thing of the past for most non drag race applications.
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On the compound turbo set ups the purpose is to boost the pressure, not just increase volume.

Single turbos have a range of efficiency that they can produce pressure, if you go beyond that efficiency range they will produce slightly more boost but considerably more heat. By using one turbo to feed pressurized air into the second one it continues to boost the pressure. Since the second turbo is dealing with relative pressure the final output is a two step in absolute pressure.

Gus
 
bdumont said:
funny finding this thread, I have a GMC 671 just begging to get on my 6.2 and have been thinking about it.
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Thats what made me think of this to start the thread, I love the 6.2 engine. I always wondered if you could use a supercharger on one when I had my 2wd burb. on the power cuves that I've seen, the SC motor curve is way more appealing than a turbo motor curve. I like lots of power and grunt down low that holds flat then tapers down towards the high R's. I have no use for high R's. maybe this is possible, I dont know cause I'm pretty turbo stupid. but the whole waiting for it to spool up to get to the power in the few turbo cars I've been in didnt impress me. Diesels may be different..
 
this is the one I was looking for. a SC off a newer mustang. over a 88mm primary.


 
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