Saw two new 6.7 Cab Chassis at the dealer

[Jumbo Jet]

What bothers me is mandating 15 PPM ULSD and then requiring all that EGR (Exhaust Gas Recirculation) crap to boot.

I remember all the early years of gasoline engine EGR and just how long it really worked. Almost any engine over 50,000 miles would plug all the EGR ports, hoses, etc. and no longer worked! Computer controlled fuel delivery and ignition should have eliminated the need for EGR.

I am assuming that the EGR is closed off until the Cummins reaches normal engine operating temperature. Short trips where the engine never reaches full operating temps will be problematic with EGR.

 

[Signal73]

cab+chassis

Guess they are now available, here's one on ebay.

 

[DieselFiend]

EGR = Exhaust Gas Recirculation. I think thats going to be extremely troublesome in the future. What the heck is the point? EPA really burns my ***.

 

[TFlory]

not only will messing with the emissions be an instant waranty voider and it WILL set every code known to man but I will also tell you that dealers will not hesitate to turn you in; this is no longer a game of a kitty cat but a whole new level of tampering with a emissions system the "I got a new exhause system installed what do you mean they forgot the cat" is not going to fly on this one... . Just a thought guys

You think a dealer will turn you in for modifying your vehicle? I doubt it.

Waranty issues aside, modifying gas engines has been going on for a long time, and aftermarket performance shops and enthusiasts will always find a way. (Custom programming, simulators, etc).

 

[MCrossley]

I know that the dealers are being pushed down that direction speaking from the fact that I work for one... I am not saying it won't be possible we always make stuff work its just I think the penalties will be greater...

 

[sag2]

These trucks are now OBDII compliant and fooling with them is now emissions tampering. I think any reputable aftermarket company will have a tougher time getting modifications that are legal. And lately, DC and STAR have been approaching the tampering issue by claiming emissions tampering. They feel they have better luck in court because tampering with emissions is just plain illegal, and you apparently don't have to prove a failure. Personally I would to have to stand before the judge and claim my "illegal emissions tampering" was not the cause of my warranty failure!

 

[mholje]

One of my main concerns with this engine is the siamese cylinders. My bet is that overheating this motor would guarantee scored cylinders.

 

[Gary - K7GLD]

One of my main concerns with this engine is the siamese cylinders. My bet is that overheating this motor would guarantee scored cylinders.

Siamese cylinders? Are they all that way, or only a few (not that it makes much difference!)? I remember the related problems with some of the GM gasser V8's because of Siamese cylinder design!

 

[mholje]

Siamese cylinders? Are they all that way, or only a few (not that it makes much difference!)? I remember the related problems with some of the GM gasser V8's because of Siamese cylinder design!

All of them are built this way, here's a cutaway view, #ad




As you can see, no water jacket between cylinders. Time will tell if there are adverse effects such as GM had with the small block 400.

 

[JOdell]

Siamese cylinders?

Please explain? I really don't want to sound dumb but I have no idea what this means. -Jason

 

[EMD-Run8]

It means there's no waterjackets between the cylinders. I think it can cause problems if not done right and the engine overheats.

 

[mholje]

Please explain? I really don't want to sound dumb but I have no idea what this means. -Jason

In an engine with siamese cylinders, there is no gap (water jacket) in the casting between cylinders. This can lead to hot spots as there is no coolant directly between each cylinder.

 

[betterthanstock]

One of my main concerns with this engine is the siamese cylinders. My bet is that overheating this motor would guarantee scored cylinders.

You are right, the cylinders cannot remain round as they expand more than the outer wall of the engine (the siamesed part will get squeezed together and force them to become oval), and scoring will be more common. I wonder if they compensate for that in the piston grind. It could be that they don't have all 6 siamesed together. That would be bad for such a long bloc.



The industrial 6. 7 on sale for a few years, has a longer stroke, so I suppose it still has the separate cylinders. Maybe DC imposed upon Cummins to keep rpm high and prevent torque from getting too high in our pick-ups, hence the decision to bore it to the max, rather than stroking it. After all, they have their MB engines they could replace this with, in a few years.



These engines will force thru a lot of cool air (and cooled exhaust) to keep the fire moderate, and keep NOx low. I can't wait to hear some MPG figures, which I suspect will be lower than the 5. 9.



I also notice a device labeled "throttle valve" #@$%!

 

[BlakeDavis]

here is my question, I have seen these new trucks at my local dealer so I assume that if I wanted to buy one right now i could, so where would i get fuel, Dont you have to run Ultra low sulfur fuel in it? I have yet to see any ultra low sulfur fuel at the pumps. Everywhere I have bought fuel lately I still see the sticker on the pumps that say "It is illegal to use this in 2007 and later model vehicles. Use could also damage your engine. " I assume that shortly ultra low sulfur will be all that we can buy but wont this have to happen pretty soon since the new engines are out now?

 

[CUMMINZ]

One thing is for sure, it will take a lot more to swap out a turbo or intake. Lots of gizmos on there.

 

[sag2]

The throttle valve is there for the EGR. This engine will have EGR flow at idle as well as cruising, so you need the throttle valve to create a low pressure area so the exhaust gases will flow into the intake when above atmospheric pressure.

 

[betterthanstock]

The throttle valve is there for the EGR. This engine will have EGR flow at idle as well as cruising, so you need the throttle valve to create a low pressure area so the exhaust gases will flow into the intake when above atmospheric pressure.

I thought they used the variable turbo to apply some back pressure to force the gasses into the intake. But maybe some other manufacturer has a patent on that idea. They advertise they can use turbo as an exhaust brake also.

 

[Tomeygun]

After seeing those pics on the 1st page, I just went and washed and polished my truck... Its gonna be with me a while



Really though, look at gas engines now'a'days, Just when you think you have to go old to get the best HP - They come out with a EFI high HP motor with cats and 92 octane and still knock down 600hp.



So maybe we are think about this all wrong... I bet the aftermarket companies will not be removing any of the emissions sensors, I suspect they will just supress the signals and show the ECM what it wants to see. The questions will be HOW MANY sensors are thier to keep happy???



Ahhh - Smoke and mirrors, Gotta love it

 

[rbattelle]

Really though, look at gas engines now'a'days, Just when you think you have to go old to get the best HP - They come out with a EFI high HP motor with cats and 92 octane and still knock down 600hp.

Yes, but it's taken 25 years for them to mature to this level. Remember how awful engines were in the 80s and early 90s? Remember the Corvette with <200 hp?



Ryan

 

[Cummins Thunder]

Ahhh - Smoke and mirrors, Gotta love it

Exactly what he said! It will be like fooling the MAP sensor on our current trucks. But many times over!