Turbo longivity???

[NetworkMD]

Hi in theory if you have two engines that produce similier power one turbo and one natural is it likely the natural aspirated engine will last longer due to reduced stress of the Turbo??

I am also thinking the Turbo is more fuel efficent because it is a smaller cc but making the same power?

Thanks

 

[driver444]

I can't answer your question in terms of tractors specifically. I can tell you as a truck driver that turbo diesel engines of today are lasting well over a millon miles in heavy trucks with proper maintenence. Every bit as long or longer than non-turbos. In fact, when there is an engine failure, (which is very rare), typically it is the turbo itself that lets go.

For the most part, there are three things that kill diesel engines.
1. Dirt (in the air intake)
2. Lugging the engine
3. Excessive exhaust temperature.

As far as stress on the engine, if you have a turbo, and the engine is making more power, you're less likely to lug the engine. Just keep it tached up.

 

[Grrrr]

I think that most tractors you buy new these days in the over 50 HP category come turboed as standard. Then you get more power for the same fuel.

We have a horse lorry with a turbo on it and the guy who built it for us said to always give it a couple of minutes to warm up and the same again when before you shut it off.

He said this was because the turbo is spinning very fast and if you shut it off before it has slowed down the bearing in it can go without oil for a while.

 

[driver444]

That's absolutely true.
I forgot to mention that. Warm up time is crucial, as heavy oil takes a while to get to the top of the motor, AND, not only should the turbo wind down before shutting it off, but it should cool down too. You never want to shut down a motor right away after it's been busting a gut for hours. Let it sit and run a couple minutes.

 

[NetworkMD]

Thank you I appreciate the input, I agree I understand if the engine has been running hard and it is shut down immediately which causes the oil to stop circulating through the turbo, it can continue to spin and overheat the bearings.

The reason I ask is I am looking at a 7010 which has the 70hp Turbo 4cyl

 

[BobG_in_VA]

Thank you I appreciate the input, I agree I understand if the engine has been running hard and it is shut down immediately which causes the oil to stop circulating through the turbo, it can continue to spin and overheat the bearings.

The reason I ask is I am looking at a 7010 which has the 70hp Turbo 4cyl

Couple items that may interest you: The engine in the 7010 is a low boost turbo model of the Mahindra 6000 (195 cu. inch). The 7010 has an 18.4 to 1 compression ration, whereas the normally aspirated 6000 is 19.4 to 1. Secondly its not really the bearings in a turbo overheating its the oil itself....as the turbo is run by exhaust gases "dumped" thru a gate to the turbo when the engine requires more power. Oil obviously lubes the turbo. when you shut down a turbo engine (gas or diesel) without a cooldown of a minute or two, the superheated turbo (read exhaust) literally "cokes" the oil sitting in the turbo bearing housing....sooner or later very little oil can get thru after the buildup of the coked oil....thereby causing turbo failure/bearing siezure. PS the 6000 Mahindra engine in its normally aspirated version appears to be bulletproof. BobG in VA