Small Diesel Engines - Natural Aspiration vs Turbo Charged?

[mred2]

I thought the Mahindra had a DOC on it. And I don't think it is the only one.

 

[dodge man]

I guess in theory a turbo could boost enough to force air through the cylinders to force extra air into the exhaust if there was enough overlap in the cam. I don't know if that's how it works though.

 

[kevin37b]

As a Diesel Development engineer for about 35 years, all I can say is that there is a lot of bad or ill informed information in this thread.

Rather than getting into a pissing match, I値l leave it at that.

I agree !

 

[kevin37b]

WILKPEDIA , TURBO

 

[buickanddeere]

inject the fuel such that not all burns and you have raw un-burned fuel, using less air and increase boost. It occurs during exhaust and intake stroke when both valves are open. That gets the fuel and air into the DPF to get it hot. Some how one way or the other you have to increase the amount of air/oxygen going into the DPF or how else how is it going to get hot enough to burn off the soot. Not all of the engines out there have an injector going into the DPF. If it was hot enough during normal operation, why then would we need a regen? They are doing it somehow?

Perhaps a refresher is on order regarding portions of the Rankine Cycle , the somewhat related Otto engine and Diesel engine theory .

 

[crippler]

I found this thread very amusing from all the diesel "experts" that commented on diesel engines and turboing an idi diesel. Being a Technician for over 30 yrs I can tell you a turbo will make it more efficient and depending on the size of the turbo will determine how much the power will increase. thus the more boost the more power. with 5 to 7 pounds you should see a 20 to 25 % increase with power up to 15 lbs or so netting 76% increase. there are formulas on the internet if you google it and several videos of people who have added turbos. Including one on a dyno, so take all your advice with a grain of salt.

 

[finn1]

Better stick to turning wrenches, and stay away from engineering.

 

[SirMaxwell]

As a Diesel Development engineer for about 35 years, all I can say is that there is a lot of bad or ill informed information in this thread.

Rather than getting into a pissing match, I値l leave it at that.

finn1, Any chance you could explain how turbos apparently offer all benefits and no drawbacks (so sayeth the forum). Seem's to break the 'something for nothing rules'.

 

[3Lfarms]

It is a common saying that turbos are free power, but Its not actually free horsepower. However, it is a very efficient power adder. And there are drawbacks to turbos that aren’t there with a supercharger, ie turbo lag. Superchargers offer instant throttle response, but transmitting a hundred or more horsepower with a belt and pulleys wastes energy. Transmitting the energy with compressed air is more efficient ...if the piping is sized and bent correctly.
It’s just in most Diesel engines, instant throttle response is not a major concern. Efficiency and longevity are more important.

 

[ning]

It is a common saying that turbos are free power, but Its not actually free horsepower. However, it is a very efficient power adder. And there are drawbacks to turbos that aren’t there with a supercharger, ie turbo lag. Superchargers offer instant throttle response, but transmitting a hundred or more horsepower with a belt and pulleys wastes energy. Transmitting the energy with compressed air is more efficient ...if the piping is sized and bent correctly.
It’s just in most Diesel engines, instant throttle response is not a major concern. Efficiency and longevity are more important.

There's "free power" which a turbo recovers in the form of unused energy in the exhaust (definitely a few percent, though not a ton). Typically though turbos are used to make a small engine act like a bigger one... including most of the big engine's mpg...