Whats the duty mean?

[Big_Daddy_T]

Ive looked high and low for information on duty ratings. What is the benefit of a medium duty engine as opossed to a light duty engine? Im looking for real world application. Im not looking for someone to stroke my ego. I just want to know what makes a medium duty engine, well, medium duty.

By the way just to close the question in my mind. I went to the local ford dealer and the new 6. 0 is light duty.

 

[Chipstien]

Lets see, medium duty is better because it is stronger, is better designed (str8 six), reacts better to BOMBs, more powerful, and doesn't use recycled beer cans in the casting. Stroke, Stroke, Stroke, Stroke. :-laf :-laf



LOL, I couldn't resist.

 

[FFutch]

The ford guys argue it's just an E. P. A. thing,but just look at the bottom ends and connecting rods. This is why our 'lil 5. 9s can handle 700+h. p. ,80+lbs. of boost,drugs,or whatever else we throw at them. I'm not saying the P. S. D. is a bad engine just not as beefy as ours. I think the duty ratings have to do with the loads it can carry and time to o-haul. Cummins only makes medium/heavy-duty and heavy/heavy-duty... Doug

 

[Shovelhead]

Found this on DTR this morning:

Thanks to ascraeus for the find.

"Size Matters"

 

[BV]

Light/Medium/Heavy Duty

What they said. The rating tells the Mfg what kind of rig the engine can used in. I believe that the EPA also has different standards for the light / medium / heavy duty ratings.



It's interesting to see what the PSD is used in compared to the Cummins ISB (or 5. 9 i6 is you prefer). Our little six can be found in the fire trucks, sanitation rigs, dump trucks, large RV's, agricul and back up generators. You will not find too many PSD's in those conditions.



Oh - And the ISB (Medium) rating allows it to be an engine option in the F650 17,999-29,000 GVWR class or Standard engine for the 29,000 GVWR / 70,000 GCWR class.

 

[bighammer]

I'm not sure, and I couldn't find the info I had seen a while back, but I think duty rating refers to amount of time it can run at rated load. For example, light duty can run for short durations at full load (max HP) and maybe a heavy duty can run at maximum load to the governor 24/7. I'll try to find where I saw that and post again.

 

[Big_Daddy_T]

Summary: Engine duty cycles



Solution:

Thanks for your email request about emission duty cycles.



There are 3 levels of EPA certifications:

Light-heavy duty, Medium-heavy duty and Heavy-heavy duty.



Light-heavy duty engines... ... ... ... expected emissions warranty life 110,000 to 120,000 miles

non rebuildable engines limited gross weight capability



Medium-heavy duty engines... ... . expected emissions warranty life 185,000 miles

rebuildable engines for vehicles up to 33,000 pounds



Heavy-heavy duty engines... ... ... expected emissions warranty life to exceed 500,000 miles

rebuildable engines for heavy duty use for vehicles up to

120,000 pounds



Cummins only sells Medium-heavy duty or Heavy-heavy duty engines for vehicles in excess of 8600 GVWR.

The engine life-to-overhaul expectations for the Cummins B5. 9 series 12 valve mechanical engine is 300,000 miles and 400,000 for the ISB 24 valve electronic engines.

The C8. 3 and L10 engines have expected life-to-overhaul or 800,000 miles.

The M11 engines have 900,000 miles and the N14 has one million mile expected

life-to-overhaul.



Is that what your lookin for?

I would like this decyphered. I read what I want to read. Is there any other wording to close the gap between what I think it means and what it actually means.

 

[illflem]

So where does Ford's Super-Duty fit in there?

 

[Ncostello]

The new 6.0's

They seem to fall into the Light - Light Duty Engines with an expected emissions warranty life of 1000-2000 miles. Non-Rebuildable, Non repairable, limited to the weight of the truck itself...

 

[Texas Diesel]

quote:

They seem to fall into the Light - Light Duty Engines with an expected emissions warranty life of 1000-2000 miles. Non-Rebuildable, Non repairable, limited to the weight of the truck itself...





This is assuming they run long enough to get off the transporter

 

[Big_Daddy_T]

you guys are bad.

 

[CROW]

Hey Shovelhead or someone who knows more about computers than me. I would like a full-size picture of the connecting rods. Too bad we don't have dimensions such as size and weight. I would like to make photocopies and when a Powerstroke or Duramax owner or potential CTD owner asks me why I bought a Cummins instead of brand F or C, just whip out the picture. Think that might start a conversation? Course this would all be done in fun and good humor (seriously), hope the other guys are happy and get good service from their trucks (seriously). Not in anyway saying the Duramax or the Ford/Navistar 6. 0 are bad motors, just not in the same class with the Cummins.

 

[JoeyD]

Do you guys get stiff shoulders from constantly patting yourselfs on the back?

 

[Big_Daddy_T]

roflmao.





This is great Im glad we all can keep our sense of humor. It keeps things light. Keep up the good work.

 

[EricBu12]

heres a better pic of the rods

 

[Big_Daddy_T]

I think thats the older one of the 7. 3. The new one shows the 6. 0s,. At least thats what it said.