Turbos on buses & big rigs?

[Atomic Rooster]

Originally posted by: Eli
Not all large diesel engines are turbocharged.

Oh. Pardon me. Some are blown. Including the massive 12 cylinder engines running dual 6-71 blowers. Some are even blown and turbo'd and use water injection to extract more power. (Sorta like NOS.)

I've had other problems resulting in loss of boost that absolutely killed power output, but I wont bore you with the details because I obviosly don't know what I'm talking about. :beer:

 

[Iron Woode]

Originally posted by: BadDaddy

Originally posted by: Eli
Not all large diesel engines are turbocharged.

Oh. Pardon me. Some are blown. Including the massive 12 cylinder engines running dual 6-71 blowers. Some are even blown and turbo'd and use water injection to extract more power. (Sorta like NOS.)

I've had other problems resulting in loss of boost that absolutely killed power output, but I wont bore you with the details because I obviosly don't know what I'm talking about. :beer:

Agreed.



Our older city buses have roots type blowers. I know because I saw it with my own eyes.

 

[Nebor]

I heard that some v12 diesels have 4 turbos.... Can that be right?

 

[jagec]

Originally posted by: BadDaddy
Hate to break it to you, ALL large diesels are turbocharged. If they weren't, they would barely be able to move under their own power. The turbo blew on my truck once and the damn thing would barely do 20mph!

I've ridden in numerous diesel buses, some turbocharged, some not. If an engine is designed not to be turbocharged, it works just fine without a turbo. However, it's more efficient to use a turbo, and ALMOST all of them use one.

Originally posted by: deejayshakur

i wanna see next gen buses with nitrous.

FYI diesels use propane injection, it provides a similar effect in that type of engine.

 

[IamElectro]

Originally posted by: Eli

Originally posted by: BadDaddy
Ok you guys win. My 20 plus years experiance driving and repairing these damn things means nothing. :roll:

Your statement was a black and white blanket statement that is obviously incorrect.

Not all large diesel engines are turbocharged.

And again, the reason you had no power in your truck isn't necessarily because the turbo wasn't providing boost anymore, it is because if a turbo fails it becomes both an exhaust and intake restriction.

Actually you are partially correct. A major reason turbo charged engines run poorly after the turbo fails is the turboed engines have a lower compression than non turboed causing a less efficient fuel burn this is very important in an compression ingition engine (diesel).

I did ask my cousin who is a diesel mechanic and he did say a majority of diesel road vehicles made today are turboed or blown for a more efficient power band. A lot offroad equipment (dozers, pans, excavators, etc are not).

 

[thomsbrain]

Originally posted by: BadDaddy
Hate to break it to you, ALL large diesels are turbocharged. If they weren't, they would barely be able to move under their own power. The turbo blew on my truck once and the damn thing would barely do 20mph!

the 80's mercedes 300 diesels can barely do 20 MPH even when the turbo is working.

driving those in the mountains makes your right foot hurt from flooring them non-stop. and they actually made them without turbos, too. scary.

 

[Slickone]

I'd like to see pics of some of these turbo'd, blown, and turbo & blown engines. When I was in school, I saw a huge radial engine from an old airplane that had a SC & turbo on it.