Outer Limits 4x4 Board

I was reading a while ago that all diesel engines are classified by people in the know as light, medium and heavy duty. I can understand how a big Cummins truck engine would be called a heavy duty diesel engine but what about all our Toyota, Mistsubishi and Nissan diesel variants, what would they be?
The only one I know well is the Patrol 4.2 not sure if it would be a heavy duty engine? What would the others be?

cheers fnq

well i would say
a small brigs and stratton size motor would be a light duty (the desiel variants)

a cruiser and lux deisel would fit in the lower rang of medium duty and the big fark off earth moving deisel motors would be heavy duty

but im not really in the know

Engine size has pretty much nothing to do with it I think. Compare the 3L nissan ZD30 with the Iveco 3L engine you find in their smaller truck chassis. One is known to be weak and almost certainly would be classified as light duty. The other is a solid chunk of cast iron that can take huge amounts of boost and would be medium duty.

Richard.

Diesel engine application will determine it duty rating.

I work for a dealer of CAT equipment and an example of this would be the C27 engine, this engine is a 27 liter, V12, 1649 Cu in- but depending on it applicating its duty rating will change.

In a marine application it could have a horse power rating of 1400HP+ Because of the load factor is a constant( water pressure doesnt change) + it has heaps of cool water ( it can only sustain this for short periods) Lighty duty

This same engine in a industrial apprication has a max hp ratig of 1040hp, because load factors will vary more. Med duty

And finally in a Off Highway Truck (dump truck) its MAX power is only 730hp, because in load factors vary so much, eg when loaded and climbing out of a pit- load factors will be at 80-90percent and an engine running at 730 hp will have a greater life. Heavy duty.

I hope this helps

Daniels

DanielS wrote:Diesel engine application will determine it duty rating.

I work for a dealer of CAT equipment and an example of this would be the C27 engine, this engine is a 27 liter, V12, 1649 Cu in- but depending on it applicating its duty rating will change.

In a marine application it could have a horse power rating of 1400HP+ Because of the load factor is a constant( water pressure doesnt change) + it has heaps of cool water ( it can only sustain this for short periods) Lighty duty

This same engine in a industrial apprication has a max hp ratig of 1040hp, because load factors will vary more. Med duty

And finally in a Off Highway Truck (dump truck) its MAX power is only 730hp, because in load factors vary so much, eg when loaded and climbing out of a pit- load factors will be at 80-90percent and an engine running at 730 hp will have a greater life. Heavy duty.

I hope this helps

Daniels

Good work!

thanks

Thanks for that Daniel, But bugger me - the more HP it puts out the lower the duty! I get it now
....but
If I was looking at two separate engines each from a different maker, big engines like in your example, one is built like a brick shit house and the other one is engineered to save expense at every manufacturing opportunity, in the industry these would both hold the same duty in identical applications.
The duty range I guess is manufacturer specified so what mechanism is there for the prospective buyer to know which is the stronger and longer lasting of the two and therefore better suited to the applications duty?



My N/A TD4.2 is now officially tougher (heavier duty)than any TD4.2T on the road

thanks fnq