Finally getting a new delivery truck....

[NIsaacs]

If you put a bigger engine in...then it would become a Class 8...

These Classes or Categories are for specific uses. There is no use for a Class 6 truck with a 500hp engine. Not needed....you need that kind of power then you spec a bigger truck. More power requires more cooling, stronger frame rails, larger drive axle, more cost, etc....

More cooling...requires a different hood to allow for the larger radiator, different frame design to accommodate the larger radiator, different spring hangers to accommodate the different end of frame design....do you see where I'm going with this??

Penske and Ryder for example could give a crap how fast the truck will climb a hill loaded as long as it maintains a roadable speed. They want a truck that weighs a specific amount and costs a specific amount and will haul a specific weight that gives a certain fuel mileage with a horsepower and torque rating adequate and reliable enough to rent out for several years and get a decent return on the investment. And with a minimum of downtime under warranty or not.

If I wanted ground shaking power in my delivery trucks...I would use a bigger Class of truck....but I don't need it. My parts will get delivered with that 300 hp DD8 just fine for a lot less money spent up front....


Does it make more sense the way I've attempted to explain it???

Yes, I kind of figured it was more a cost thing than a duty cycle. Keep in mind, all the bigger additions that a bigger engine requires is being done daily on the pickup and big trucks. All in the name of competition, not duty cycle. The duty cycle have mostly stayed the same all across the classes. Yet, light duty and heavy duty keep getting bigger, more money and more power. Just seems funny that the medium duty never reached that competitive nature.

A bigger engine don't make the classification, GVW does.

You say there is no need for a class 6 with 500 hp. I get that, but here we are with 450 hp pickups and 650 hp big trucks...and GCW's pushing 45k by the big three's pickups. Again, not needed but there it is. Big RV's are the same way, more and more power.

I am thinking the medium duty, class 4-7 is in for a shake up. The bigger is better, is going to sneak up on them too. I think it will start with class 4/5 pickups, because the class 3 and down have went as high as possible. I think in order to keep going up, they will build medium duty pickups.

I also get, if you don't need/want more power for your delivery truck, 300 hp is great. I am talking about what if you do? It is not available in the middle ground. If you want 500 hp ya gotta buy a pickup or a big truck. I would rather tow 45k GCW with a 500 hp class 6 than a 450 hp class 3. I think the market is there, but not at 300 hp.

 

[TJJEEPER]

Mike, Did you ever run the VIN to see which spec motor it had? Or did I miss that post?

 

[JR]

For clarification, what class rig is your parts truck?

And what gear ratio does it have?

 

[mwilson]

I’ll have to check in the morning. Thought it was 300 horse, but will make sure. They were going to bless us with a different unit and that had a 300 horse Cummins B...

 

[mwilson]

I make sure every one of our trucks have frnder mount spots. Those are incredible, once you drive a truck that has them there is no going back..tried to capture just how well you can see ...

 

[mwilson]

Registered for 33,000 lbs. Note Excise Tax!!

 

[NIsaacs]

33,000k is the top end of class 7.

 

[Shiner]

I make sure every one of our trucks have frnder mount spots. Those are incredible, once you drive a truck that has them there is no going back..tried to capture just how well you can see ...

I hated some of the trucks we would occasionally rent that didn't have the spots. I personally like more mirrors...in all the right places.

 

[fest3er]

As someone mentioned, what are the torque specs of engines typically used in different classes? You can make 500 HP at 4k RPM, 2800 RPM, or even 1500 RPM (for land-based vehicles; we'll skip deep-water vessels).

 

[TFucili]

Well, Ram is going to reveal the new C&C trucks tomorrow. Maybe they'll bring on the power wars. "POWERED BY NICK" on the valve cover....

 

[Wayne M.]

I make sure every one of our trucks have frnder mount spots. Those are incredible, once you drive a truck that has them there is no going back..tried to capture just how well you can see ...

Mike, is that on the governor? Seems like it’s got a steep gear in her.

 

[Wayne M.]

Did you read this? I am talking about medium duty's in general (class 6-7) the N8 is not a 6.7 nor is the L9, yet they are de-tuned compared to class 8. Why? All the trucks, Class 1-8 have advanced in design by leaps and bounds as have the engines, yet the medium duty lags behind in the power department. Like I said, it bug me

Nick, I went and looked up the power specs for the Cummins L9. You can see that they’re classified either as “performance” or “ productivity”. The productivity class is tuned lower in order to work harder and have a higher duty cycle and more longevity. I’m sure fuel and DEF consumption is much better as well. The number spread s quite huge, and the top dog must provide more power than a straight truck would ever need!

 

[NIsaacs]

The number spread s quite huge, and the top dog must provide more power than a straight truck would ever need!
]

I want the 380/1250 one!! Need and want? When I bought my '01 in '03 it had 34k miles on it, so about 66k miles and 3 years of warranty left. After my modified '91 and modified Ford I couldn't stand the stock power and installed an Edge EZ and RV injectors. That lasted me 12 years, then I installed the Edge Juice 4 years ago

I think it goes back to all those miles I put on an old Mack Log Truck w/237 hp 675 CI Thermodyne Even turned up I still couldn't quite keep up with the 300 hp Maxidynes. Never mind the big Cummins and Cat guys.

 

[TFucili]

I want the 380/1250 one!! Need and want? When I bought my '01 in '03 it had 34k miles on it, so about 66k miles and 3 years of warranty left. After my modified '91 and modified Ford I couldn't stand the stock power and installed an Edge EZ and RV injectors. That lasted me 12 years, then I installed the Edge Juice 4 years ago

I think it goes back to all those miles I put on an old Mack Log Truck w/237 hp 675 CI Thermodyne Even turned up I still couldn't quite keep up with the 300 hp Maxidynes. Never mind the big Cummins and Cat guys.

A fully turned-up Maxidyne was a real BEAST.

 

[mwilson]

Finally have a free minute...

Detroit Diesel DD8 set at 280 HP / 800 FT LB

Allison 3000 RDS Transmission

Meritor 23-160 23,000 LB Rear on Freightliner 23,000 LB Airliner Suspension 5.63 Ratio w/Driver Controlled Differential Lock (DCDL)

 

[NIsaacs]

Finally have a free minute...

Detroit Diesel DD8 set at 280 HP / 800 FT LB

Allison 3000 RDS Transmission

Meritor 23-160 23,000 LB Rear on Freightliner 23,000 LB Airliner Suspension 5.63 Ratio w/Driver Controlled Differential Lock (DCDL)

I don't have a clue what your delivery route is like, but assuming a good distance between stores, I think 5.63 gears might be speed bound. Should be awesome in town.

Since I don't have exact numbers I am guessing here

Assuming a 6spd auto with 2 overdrives, 5.63 gears and 40" tires, 2100 rpm will be 68 mph. I used this transmission, after you click on the link, click on specifications:

Let us know what the drivers think.

https://r.search.yahoo.com/_ylt=Awr...-6962861/RK=2/RS=JAae6nvNS..qZJy8MEpYhHQHmKk-

 

[JR]

I was just looking at the specs on that unit as well.
https://www.allisontransmission.com/en-gb/transmissions/models/3000-series

Says up to 7 speeds with different gear ratio spreads depending on vocation, so assuming it was specd for the job it may be ok.

 

[Ozymandias]

DEF consumption is straight locked to ones right foot, the more load on the engine the higher the consumption.
Medium load is best for DEF usage.

Goes above 10% if used really hard.
And below 3% if feathered.

In my DD Class 8 I went up to 10 Gallon DEF a Day hard working in the Pit.


On the big rigs I'm a Volvo guy, never had another truck that delivers so much torque in such a broad rpm range. Kills every other brand going uphill with the same load.