Gas motor future

[jamesrxx951]

Originally Posted by Cumminsfan

That's interesting. My 12 Ram CTD manual says the 6.7 CTD requires no break in. Only thing to do is not tow for 500 miles for the drive train to break in.

I think the term "break in" is also used to much. The only thing that should break in is the rings. The bearings have an oil film between them and the rotating components in them. There should not be any real touching as this is where the wear comes in. With the precision of todays engine blocks, pistons, rings, you should not need much break in for the rings. If you have blow by due to unseated rings, this can cause other issues. Oil consumption, excessive crank case pressures which can lead to oil leaks. It does seem like I have read here that some owners guides say it takes that specific engine 15K or so to fully break in. To me that seems like a very long time for a set of rings to seat.

[RustyJC]

Originally Posted by jamesrxx951

It does seem like I have read here that some owners guides say it takes that specific engine 15K or so to fully break in. To me that seems like a very long time for a set of rings to seat.

That period has little to do with oil consumption (I've never had to add oil to a B-series Cummins). Rather, fuel consumption typically improves up to 20,000 miles.

Rusty

[Cumminsfan]

The Ram CTD DVD says to run it under load as much as you can for the 1st 6000 miles to expedite break in. It's not really a break in like in the old days where you had to baby it for X amount of miles but more to seat everything. They don't want you running to the grocery store for the 1st 6000 miles. Like they saying goes "drive it like you stole it".
The days of saying it's not broke in for 50,000 miles are long gone.

[rlwithrow]

Originally Posted by terry735001

??? aa if you get the right VER of the 8.1l you can see 560 ft at 2200 rpm
add a turbo and get up over 600 and this is a gaser that is setup like a diesel

I have an '03 GMC with the 8.1 with 54,000 miles on it. A little over 3000 miles on an oil change and it's still full so I think it's a keeper. That's the thing, if it had a turbo it would be more efficient at making more low end torque.

[rlwithrow]

We talk about using less fuel with a diesel but in reality, only about 10 gallons of diesel can be refined from a 42 gallon barrel of crude oil verses almost 19 gallons of gasoline. That is almost twice the gasoline fuel per barrel of crude. If you look at pulling an RV with a truck that could get 10 MPG with a turbo gas motor as compared to a diesel with the same RV getting 13, which fuel has less impact on the number of barrels of oil we need to import per year?

If both trucks take a 1000 mile trip, the gas truck will cost $297.00 in fuel with a $2.97 gal price. The diesel truck will cost $291.54 with a 3.79 gal price. That is only $5.46 more to feed the gas truck. The diesel would use 76.92 gallons of fuel while the gas truck would use 100 gallons of fuel which is less than 25% more gallons. It would take 5.26 barrels of crude oil to produce the 100 gallons of gas need for the gas truck to make the 1000 mile trip. It would however take 7.69 barrels of crude oil to make the diesel fuel for the same trip. It takes 46% more crude oil to produce the diesel fuel needed to make the trip as compared to the gas truck.

Come on Chevy, put a turbo on a big block!

[RustyJC]

That's a straw man argument. The U.S. exports diesel fuel to the rest of the world (primarily Europe) and imports gasoline because of the vehicle mix in the U.S. - there's more demand here for gasoline than diesel. More diesel usage in the U.S. would merely bring the supply and demand equation closer to balancing.

By the way, pulling the same 13,500 GVWR 5th wheel over the same route, my 1996 Dodge V-10 dually got 6.5 MPG; my 2002 Cummins HO dually got 11.5 MPG. That's quite a bit more difference than 10 versus 13 MPG.

Rusty

[hone eagle]

Originally Posted by rlwithrow

We talk about using less fuel with a diesel but in reality, only about 10 gallons of diesel can be refined from a 42 gallon barrel of crude oil verses almost 19 gallons of gasoline. That is almost twice the gasoline fuel per barrel of crude. If you look at pulling an RV with a truck that could get 10 MPG with a turbo gas motor as compared to a diesel with the same RV getting 13, which fuel has less impact on the number of barrels of oil we need to import per year?

If both trucks take a 1000 mile trip, the gas truck will cost $297.00 in fuel with a $2.97 gal price. The diesel truck will cost $291.54 with a 3.79 gal price. That is only $5.46 more to feed the gas truck. The diesel would use 76.92 gallons of fuel while the gas truck would use 100 gallons of fuel which is less than 25% more gallons. It would take 5.26 barrels of crude oil to produce the 100 gallons of gas need for the gas truck to make the 1000 mile trip. It would however take 7.69 barrels of crude oil to make the diesel fuel for the same trip. It takes 46% more crude oil to produce the diesel fuel needed to make the trip as compared to the gas truck.

Come on Chevy, put a turbo on a big block!

A turbo gas engine will get 5 mpg not 10, a 3.5 ecoboost puling hard will get less then 10 much less a big block ,which by the way will never happen

[JohnRR]

Originally Posted by hone eagle

A turbo gas engine will get 5 mpg not 10, a 3.5 ecoboost puling hard will get less then 10 much less a big block ,which by the way will never happen

Maybe if Jon Brazel changes his mind

Thread link

[George Schweikle]

How about this? (from Road & Track magazine). I have also read that BMW is working on the same principle:

"The inevitable next step stemming from gasoline direct injection is on the horizon, and it's called DiesOtto. This is the combination of the Diesel cycle and the Otto cycle (Otto is what we use in gasoline engines). Think of it as a diesel engine that uses gasoline fuel. The combination of the two requires mind-bendingly precise engine controls. In a nutshell, the system compresses the air-charge in the cylinder until it's superheated; injects gasoline into the cylinder; the mixture ignites from the heat and drives the piston. Why? Diesel fuel is dirty and the Otto cycle is thermally inefficient. The combination eliminates the weaknesses and augments the strengths from each.

Think it's crazy? Word on the street is that GM already has prototype engines destined for their next-generation trucks on the road."

Originally Posted by rlwithrow

We talk about using less fuel with a diesel but in reality, only about 10 gallons of diesel can be refined from a 42 gallon barrel of crude oil verses almost 19 gallons of gasoline. That is almost twice the gasoline fuel per barrel of crude. If you look at pulling an RV with a truck that could get 10 MPG with a turbo gas motor as compared to a diesel with the same RV getting 13, which fuel has less impact on the number of barrels of oil we need to import per year?

If both trucks take a 1000 mile trip, the gas truck will cost $297.00 in fuel with a $2.97 gal price. The diesel truck will cost $291.54 with a 3.79 gal price. That is only $5.46 more to feed the gas truck. The diesel would use 76.92 gallons of fuel while the gas truck would use 100 gallons of fuel which is less than 25% more gallons. It would take 5.26 barrels of crude oil to produce the 100 gallons of gas need for the gas truck to make the 1000 mile trip. It would however take 7.69 barrels of crude oil to make the diesel fuel for the same trip. It takes 46% more crude oil to produce the diesel fuel needed to make the trip as compared to the gas truck.

Come on Chevy, put a turbo on a big block!

[jimcumminsw]

Originally Posted by rlwithrow

I'd like to see a cost per mile overall comparison between a modern turbo large motor gas truck and a comparable diesel. Say the new Dodge with the 6.4 with a turbo and their own diesel over a 100,000 mile duration pulling a 10,000 pound trailer. This would include the purchase price, all maintenance and repair and fuel costs. I'm going to guess they wouldn't be that far apart. That said, if I'm getting 8 mpg and my friend with a similar sized 5th wheel is getting 11 with his diesel,, what really is the point or the difference in cost to own besides trade in value in the end.

Will I have records going back to Nov 07, first tank of fuel on my 08 Ram with the 6.7L, 6 Speed auto 68RFE and 3:73 gears,4X4. I did not consider purchasing cost of the truck since this will vary depending on trade in value of trade and cash payments. My truck OD has turn exactly 70,000 miles so I am a little under the 100,000 miles but the cost should stay the same.
I follow the manufacture mileage recommendation for maintenance except fuel filters; this is every 10K instead of the 15K. I also have two fuel filters instead of just the one factory filter. I am pulling a 318SAB Cougar total GCW is 18,240 lbs. My fuel cost is $0.26 a mile for diesel fuel and my maintenance cost is $0.06 a mile. This includes a set of new Michelin tires, Shell Rotella 15W-40 oil, Amsoil differential oil and ATF+4 transmission oil, all Fleetguard filters and or Mopar filters. So the total cost would be $0.32 a mile which is less cost in total operation than my old 2001, 6.0L, Chevy 2500HD gasser that I sold to my son.
BTW, I never got 8 MPG when towing with the gasser I normally would see 6 or maybe going downhill 7 MPG's; with my Cummins diesel I will see between 11 with a high of 13MPG's when towing.

Jim W.

[caissiel]

Two more example,

In 98 I bought a 98 K2500 Chev 6.5L diesel for $2000 less then my neighbour bought a Ram 1500 4x4.
Same model cab and box.
I pulled a 14000 lbs trailer for 9 years and a total mileage of 235k km. He towed a 6000 lbs trailer and total mileage of 70k km.
In 2007 we both bought Ford SDs and i got $10000 for my truck and he
was offered $5000 for his which he kept.
Mine got 23/10 MPimpG his was 16/8 MPimpG. Unloaded/towing.

His 2000 F350 is worth as much as he paid for it 7 years ago. I cannot replace mine for the same value. I lost a total in depreciation of $4000
and plan to tow my 15000lbs trailer an other 5 years.

A local truck driver bought a new 98 1500 350 GM to pull his 6000 lbs trailer and always told me his truck had more power then mine. Which he actually did in the specs.

We flush our coolant the same day after 5 years. We were both at the parts counter together at the same time buying new thermostats.
I asked him to show me his and he did. The hole in the center was barely 1 inch. I showed him mine with at least a 1.75 in hole and told him I had 2 to buy for my truck. His comment was. Really!!!
I told him that it was the reason his truck could not work as hard as mine. He grinned and walked away.

[hone eagle]

..........."I asked him to show me his ".................:-)

[caissiel]

Originally Posted by hone eagle

..........."I asked him to show me his ".................:-)

LOL,!!!!!!??

[wingnut60]

That's impressive--a 'stat contest...
Joe