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Old 01-23-2011, 10:04 PM
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Default Cummins Diesel

So i have seen and read folks saying that the Cummins Diesel is the only "real" diesel that you can get in a pickup. IS is this true from a technical standpoint? Looking for unbias facts here...
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Last edited by xjrev10; 01-23-2011 at 11:12 PM.
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Old 01-23-2011, 10:33 PM
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Sorry, but nope. The Ford and Chevy diesel engines are just as 'real' as any of the Cummins. The 7.3l was used in a lot of commercial applications. I don't know about the 6.6l.
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Old 01-23-2011, 10:44 PM
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Okay that makes me feel stupid. Now i gotta go on a search for where I read that....

Okay did a little looking around... From what I could find in my last bit of searching, the Cummins diesel has been considered a real diesel by opinion, because the engine originally was used in medium and heavy duty applications until Jack Roush decided to put a Cummins in a pickup. (as a prototype) Also the 5.9 engine has been basically the same since the first B-series was dropped in a big rig or bus.
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Last edited by xjrev10; 01-23-2011 at 11:10 PM.
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Old 01-24-2011, 07:41 PM
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Alright I will explain this out to it's fullest extent.

The cummins diesel is a real diesel, or at least that is what everyone says. Why? Well believe it or not, a lot of it is just because it says cummins on it, so it "must be good". But I will explain the deeper thought logic of those who chose to think that way.

The cummins is an inline 6, big rigs are also an inline 6. The logic behind this is that an engine with comparable displacement to the ford and chevy must have a longer stroke to equal the same displacements. A bigger stroke usually means more torque. The towing crowd is obviously all over that, so they want a cummins. There is also the ease of fixing an inline 6 since it is very narrow in comparison to the V8's, so you have lots of room to get in there and fix it and be back on the road.

Now here is why the other 2 are also "real" diesels. If you look at the specs, dodge is currently the lowest powered diesel you can buy. The powerstroke has 400HP and 800TQ, the dmax is not far behind. The cummins is 350HP 650TQ. Obviously it is falling behind. But lets look at a big rig, like the ISX, the lowest tune (I will use for comparison reasons) is 435HP and 1450TQ. Hmm, why is the HP almost the same as a powerstroke when it is twice as big? HP is basically speed. You don't see big rigs racing the rice burner on the strip, but you DO see the diesel pickups doing that.. You also see guys trying to pull their TT at 80mph down the interstate, including the 7% grades. Though big rigs and pickups are both diesels, the market has made the application tune into 2 different animals. The diesel market does not want a 18 spd pickup with gobs of TQ and no HP, they want high speed high acceleration HP, with or without a trailer.

Knowing that, you can now see that the pstroke/dmax/cummins all fight for the same territory and that is why the cummins is at 350HP rather than the 160HP/400TQ it started out with in the 1st Gens. There are guys pulling huge loads with those stock 1st gens at the same speed as the big rig next to them, they were built like a cummins was meant to be built. These new diesels are not tuned for that, they are tuned for the best of both worlds of towing and acceleration. In the end, we have 3 brands of trucks with big TQ and HP numbers. They all have about the same power curves and everything. I can tell you between the current models, they tow just like their numbers show, the cummins is dead last, I have rode in all 3 towing and it is a dog compared to the others. Of course that is because of the tune, if you got all of them to be say, 1000TQ, it would be a better comparison, the ford has a bumped tune from the factory (it wasn't 400hp/800tq until they saw the dmax numbers, they bumped it up to make it look better).

Basically it all comes down to a few things. Reliability, Longevity, Acceleration, Efficiency, Other. To get one or the other, sometimes things are traded off. The V8's are more of a racing than towing engine (though they still tow good), so they have parts wear out a little faster.

The only "real" diesels anymore are the ones in big rigs or the 1st gen cummins'. All the rest are built around the mindset of a guy wanting to pull his trailer at 80mph. Not everyone will do it, since some people want MPG, but if you do want to do it, the new diesels are capable, which is why you bought it of course lol.
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Last edited by ISX; 01-24-2011 at 09:14 PM.
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Old 01-24-2011, 08:22 PM
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This is exactly what I was looking for. Thanks for putting it all together for us ISX!
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