I have a friend that is trying to decide on the Cummins or the Power stroke. I answered most of his questions but there are a few that I do not know, I was hoping someone could help me on them:

1. Crank shaft's size? Cummins vs Power stroke
2. Main bearing diameter and width? Cummins vs Power Stroke
3. Rod bearing diameter and width? Cummins vs Power Stroke

With these numbers he is trying to determine who has the more durable bottom end.

Thanks in advance.

 

I cant give you any real specs, but I can assure you there is no doubt the Cummins has the stronges bottom end of any light duty truck.

Eric

 

I myself believe that Cummins has the better overall engine but I been having a hard time finding real data numbers with comparison to the Power Stroke. I have seen the picture with the piston sizes. Just hoping someone has these numbers.

 

At the risk of starting an argument , Cummins is Medium duty, and Duramax and Power Stroke are both classified as light duty. The Cummins is without question, heftier on the bottom end. Of course big rigs call most little diesels, peanut engines.

 

By all means I am not looking for a argument. I was trying to help a friend out and try to give him some real life numbers. When you really get down to the nitty gritty someone has to buys the Power strokes, just as long it is not me.

 

I have a B series crank in my garage now. I could try and get some rough measurements tomorrow if you'd like, just let me know.

 

I dont classify a cummins with a dmax and a power stroke, that would be ******* the cummins I think lol

 

If you don't mind, I also wrote cummins a little email asking the same question.

 

I really do not like to do it either. I am trying to get some more hard fact / data spec. to help my friend to make a decision. I am trying let him make a huge mistake and end up buying a Found On Road Dead.

 

No offense to your friend, but that is a poor way to determine durability. While size has something to do with strength, the design(shapes, angles, ratios) of parts and composition have a lot more to due with strength.
If he really wants to know their durability, he should look at how long the engines have been in service with out major repairs and what type of vehicles and work these engines are used in.

 

Who has that pic of the Cummins pistons and rods compared to the Izuzu and Navistar?

 

I do not have anything to offer you spec wise,but I can assure you there is no comparison between the 2 engines! The Cummins is built much heavier duty,enough that the EPA recognizes the Cummins as a medium -heavy duty engine for emission classification,and the 6.0,6.4/7.3 PSD as a light-heavy duty engine.They use engine construction and intended service life as factors in there decision ,so as to place a service life on emission components.

Keep in mind,you really are comparing apples to oranges here,the only thing these 2 engines have in common is they both burn diesel fuel,as the cummins is over 200lbs heavier,will likely last at least 2x as long,and built to a different(heavier standard.) The cummins 5.9/6/7 is used in gensets,bulldozers,ag equipment,and industrial compressors,anything that requires heavy duty relaible power.You will not find a powerstroke v8 in any of these applications,it is not built heavy enough to meet the requirements for those applications.

 

- - -CUMMINS - - - - - - - - - - - - - - - - - - - -- -Powerstroke

 

 

I thought all true diesels were inline six'sss,and all the V8 designs were want-a-bee'sss.