Cadillac of tractors?

[Rob-D]

Other than the tiresome whine of working a turbocharged backhoe all day and the headache that accompanies it, I still prefer to have a turbocharged diesel, but I have had a few turbos take a dump at very inconvenient times. Luckily I could install them myself. Usually ends up a $750-$1,000 repair

My N/A Kubota has handled everything I can throw at it and begged for more and $10,000 less than a new turbo model with 1 more HP and a lot more pollution control crap that I could do without that decreases reliability.

Not being a rich boy, the choice was easy for me. Save $10,000 and suffer the "unbearable embarrassment" of owning a N/A diesel. So far, this one has left me nothing to worry about.

Couldn't live without a turbocharger on a truck. the get up and go performance is unmistakeable. On a tractor, not so important.

I agree!

Rob

 

[Egon]

Without a wastegate, the amount of boost that a turbocharger creates varies with the pressure of the engine's exhaust. This happens because exhaust pressure varies with relation to the engine's speed (measured in RPM's). This implies that as an engine reaches higher RPM's, increasing amounts of boost will be created by the turbocharger. The problem with this is that an engine can only accomodate a given amount of boost. Most stock engines are only meant to take about 10 PSI if not less. In order to regulate the amount of boost that comes into the engine, a wastegate acts as a door only allowing a given amount of exhaust to hit the turbocharger's exhaust turbine. Once the engine starts producing more exhaust pressure then the wastegate system will allow, a flap is opened to redirect excess exhaust away from the turbine blades. In turn, this is where a wastegate gets it's name. It's a gate to carry away waste.

Just in case some are not familiar with wastegate purpose or operation.

 

[Rob-D]

"Without a wastegate, the amount of boost that a turbocharger creates varies with the pressure of the engine's exhaust. This happens because exhaust pressure varies with relation to the engine's speed (measured in RPM's). This implies that as an engine reaches higher RPM's, increasing amounts of boost will be created by the turbocharger. The problem with this is that an engine can only accomodate a given amount of boost. Most stock engines are only meant to take about 10 PSI if not less. In order to regulate the amount of boost that comes into the engine, a wastegate acts as a door only allowing a given amount of exhaust to hit the turbocharger's exhaust turbine. Once the engine starts producing more exhaust pressure then the wastegate system will allow, a flap is opened to redirect excess exhaust away from the turbine blades. In turn, this is where a wastegate gets it's name. It's a gate to carry away waste."

That's the part I think the wastegate plays SpyderLK. What part do you think it plays??

Thanks Egon

 

[SPYDERLK]

Turbos don't hold better at altitude. Wastegates are deisned to open, they lose hp just like normally aspired engines do.

Wrong. The turbo spins a little faster pumping the thinner air. This enables them to hold speced boost pressure. What part do you think wastegates play?
larry

"Without a wastegate, the amount of boost that a turbocharger creates varies with the pressure of the engine's exhaust. This happens because exhaust pressure varies with relation to the engine's speed (measured in RPM's). This implies that as an engine reaches higher RPM's, increasing amounts of boost will be created by the turbocharger. The problem with this is that an engine can only accomodate a given amount of boost. Most stock engines are only meant to take about 10 PSI if not less. In order to regulate the amount of boost that comes into the engine, a wastegate acts as a door only allowing a given amount of exhaust to hit the turbocharger's exhaust turbine. Once the engine starts producing more exhaust pressure then the wastegate system will allow, a flap is opened to redirect excess exhaust away from the turbine blades. In turn, this is where a wastegate gets it's name. It's a gate to carry away waste."

That's the part I think the wastegate plays SpyderLK. What part do you think it plays??
Thanks Egon

Thats pretty much as I understood it. The point is that they are not a factor causing power loss at altitude. The wastegates action is to maintain boost below a set design level. As altitude rises it would "waste" less in maintaining the speced top intake pressure, until finally at several thousand feet it would not maintain full pressure. Only there would power drop.
larry

The engine management control system can allow the wastegate to increase pressure to a point but at high altitudes the air is so thin that the wastegate can't compensate any longer because damage from detonation problems occur.

You are off track here. Compensation does not cause excess pressure. Anyway diesels do not detonate.

 

[Soundguy]

What Whine???
I'm around turbodiesels every single day. There is no whine. I can seldom ever hear a turbo.
Only time I heard a turbo on a diesel engine whine was when it had an air leak on the pressure side it can whine or whistle. Fix the leak and no more whine.

I agree. Out of all the diesels I have right now, 3 have turbo's and 2 don't. I can sometimes hear a whine for a short duration right when it starts to really spin up after gassing on it.. but it goes away fast on my 6.0 psd ford truck, never hear it on my 7.3psd ford truck, and never hear it on my NH 7610s. IMHO.. if your turbo sound slike a mad canary.. it has a bearing problem or an air leak..

soundguy

 

[Soundguy]

Thats pretty much as I understood it. The point is that they are not a factor causing power loss at altitude. The wastegates action is to maintain boost below a set design level. As altitude rises it would "waste" less in maintaining the speced top intake pressure, until finally at several thousand feet it would not maintain full pressure. Only there would power drop.
larry

You are off track here. Compensation does not cause excess pressure. Anyway diesels do not detonate.

It's got to be better than a NA engine at high altitude. as least the turbo'd unit has some air force feeding going on.

soundguy

 

[Soundguy]

Ya know, maybe you ought to take a look under the hood of all the semi tractors on the road. They generally run a million miles or so pulling a hard load and they are all turbocharged. I've worked in the heavy equipment industry and NOTHING was running without a turbo. Most of that equipment was run like it was stolen and 20k to 30k hours mean run time between any rebuild is normal. To be blunt, just like everyone else here is saying, if you don't want a turbo diesel it's only your personal preference. There is absolutely no reliability or durability reason to not run a turbo diesel. To proclaim otherwise is simply absurd.

ditto that. in our shop yard, everything thast burns fuel oil has a t-charger.. tractors, earthworking equipment... everything.. large commercial trucks passanger trucks.. etc.

soundguy

 

[Dargo]

On a tractor, not so important.

Yup, that's why every piece of heavy equipment, modern full sized tractors, dozers, scrapers, pans etc. etc. all have turbo chargers. Most heavy tractors, such in dozers, have a couple of turbo chargers. Nah, they aren't so important.

 

[beppington]

How long has JD been using turbo's on their CUTs?

 

[Rob-D]

You are off track here. Compensation does not cause excess pressure. Anyway diesels do not detonate.

All diesels detonate, that's what that familiar knock is and knock is detonation.

"Knocking is more or less unavoidable in diesel engines, where fuel is injected into highly compressed air towards the end of the compression stroke."

Engine knocking - Wikipedia, the free encyclopedia