Gm 6.6 liter gas engine

[Nascon]

Originally Posted by Mr. Dan

Do you have a link for this info so I can read the details? I'm interested in this roll-out.

gmauthority@motrolix.com

[Grapehound]

Originally Posted by richp

Hi,


Well the old GM big block 8 liter engine was in the diesel ballpark powerwise. But in fuel economy there was no comparison -- 8-10 mpg towing or running empty.



FWIW.


Rich Phillips

We had the 8.1 litre Chevy big block V-8 in a 2005 Suburban to tow our Sandpiper 33FKD TT. (8,300#'s dry) It had good torque but nothing like the pulling power of the Cummins Turbo Diesel we have now. I bought the 8.1 at that time because the gas mileage of the 6.0 Chevy V-8 sucked too, so I figured if I was going to get terrible gas mileage I might as well have some power.

[LTnTN]

Originally Posted by moose074

I got to looking after reading your post I thought it said any combination of diesel. As for the numbers 401 hp and 464 pounds of torque that will tow most trailers

I’ll stir the pot 😁 ... the F-150 Ecoboost I just got rid of was making 415/455 with a Diablo Sport 87-octane towing tune.

Now owning a 2500HD diesel, all I read is how horrible and unreliable the emissions systems are on them. I may wish I had a good old push rod V8 soon. 😳

[BobnVic]

We have a 35-foot TT. I pull that with a 2500 HD 6 liter gas 2018 Chevy. It pulls it fantastic.

[Mr. Dan]

Originally Posted by Nascon

gmauthority@motrolix.com

Thanks... but this is an email address. I was looking for the URL of your article.

[Mr. Dan]

As is typical for any truck/TV/engine thread on here, the OP asked "Anyone have experience pulling a trailer with the new 6.6 liter gas engine." and posters want to tell why their possessions are better.

[BobnVic]

I have a 2018 2500 HD Chevy pulling a 35 foot TT with a 6 liter gas. No problem

[Hclarkx]

Originally Posted by DouglasReid

It can be done, any do it all the time, I prefer the ease of driving the diesel.

I hear this often, but I have no experience with diesel, so can't relate. I've never even ridden in one. What is it that is behind the "ease?"

Is it just just the hearing 4000 rpm vs 1800 rpm? Anything else?

I may be shopping next spring but I don't know where I could get any real experience towing with a diesel to know the difference.

[BandJCarm]

Originally Posted by Hclarkx

I hear this often, but I have no experience with diesel, so can't relate. I've never even ridden in one. What is it that is behind the "ease?"

Is it just just the hearing 4000 rpm vs 1800 rpm? Anything else?

I may be shopping next spring but I don't know where I could get any real experience towing with a diesel to know the difference.

Torque. My 6.6 Duramax is 765 ft-lbs, and the new ones are 910 ft-lbs. Gas engines MIGHT be 400+ or so.

[Hersbird]

The big problem towing ANYTHING with the new 2020 heavy duty GMs no matter what motor you get, the truck is so dang ugly the trailer will constantly be trying to get away from the truck out of pure shame.

Seriously, the 6.6 gas with a 10 speed will tow very well, the diesel will be better. Still 401 hp and 10 gears left alone an allowed to run high rpm as designed will pull just as big a load almost as fast up a hill as 445 hp and 6 gears the diesel has. Torque is great, but it is just a mathematical calculation from torque and RPM. The only way to measure power which is a force over time is with working in rpm and getting horsepower. The gas will just need that rpm. Now with 10 gears the gas can find a better lower gear to allow the rpm and then get the torque it is lacking from that gear multiplication of the transmission. The rest of the time towing, not accelerating or pulling a hill, the diesel will be much more efficient as both turbos add efficiency, compression adds efficiency, and diesel fuel has more energy in it, all things the gas motor doesn't have.

[Missdenise]

My first question is... how to I hide this thread from my husband?? We have been towing our Rockwood Ultralite with a 2013 6.2L GMC quite successfully. The truck only has 35K miles and I am not looking to replace her.

Need to keep the new 6.6L motor quiet for awhile.

[robbiels7]

Originally Posted by Missdenise

My first question is... how to I hide this thread from my husband?? We have been towing our Rockwood Ultralite with a 2013 6.2L GMC quite successfully. The truck only has 35K miles and I am not looking to replace her.

Need to keep the new 6.6L motor quiet for awhile.

if you very happy with that truck and he is to most wouldn't want that big payment. Especially if your near the end of a loan.

[BigH]

Originally Posted by Hersbird

...

Seriously, the 6.6 gas with a 10 speed will tow very well, ...

Thankfully the 6.6 gas will be paired with the 6L90E and not the 10 speed.

Originally Posted by Hclarkx

I hear this often, but I have no experience with diesel, so can't relate. I've never even ridden in one. What is it that is behind the "ease?"

Is it just just the hearing 4000 rpm vs 1800 rpm? Anything else?

I may be shopping next spring but I don't know where I could get any real experience towing with a diesel to know the difference.

I've towed with both...the low end torque of the diesel is nice and if you have a seriously heavy load it may even be required. A gas motor will have to downshift more often...this has a negative affect on some of the gentle folks.

[robbiels7]

Originally Posted by BigH

Thankfully the 6.6 gas will be paired with the 6L90E and not the 10 speed.



I've towed with both...the low end torque of the diesel is nice and if you have a seriously heavy load it may even be required. A gas motor will have to downshift more often...this has a negative affect on some of the gentle folks.

My wife always comments that she thinks it's going to blow up when is working under a high rpm. And is amazed that I tell her it's meant to be that way

[Hersbird]

Originally Posted by BigH

Thankfully the 6.6 gas will be paired with the 6L90E and not the 10 speed.

Well, that's backwards. In that case the gas will be OK but a ford 3.5 ecoboost and 10 speed will destroy it. I also think a 1500 with the 6.2 and a 10 speed will be better as well. Or the 6.4 Hemi with it's 8 speed.

[BigH]

Originally Posted by Hersbird

Well, that's backwards. In that case the gas will be OK but a ford 3.5 ecoboost and 10 speed will destroy it. I also think a 1500 with the 6.2 and a 10 speed will be better as well. Or the 6.4 Hemi with it's 8 speed.

Nothing like forming strong opinions based on facts.

[Hersbird]

Originally Posted by BigH

Nothing like forming strong opinions based on facts.

All new design in 2020 and making your premier motor a 401 hp with a six speed. Seems like what the other guys did over 5 years ago.

[BigH]

Originally Posted by Hersbird

Well, that's backwards. In that case the gas will be OK but a ford 3.5 ecoboost and 10 speed will destroy it. I also think a 1500 with the 6.2 and a 10 speed will be better as well. Or the 6.4 Hemi with it's 8 speed.

Its hard for me to understand what factors are influencing someone with such prejudice to say a certain powertrain will destroy or be better than one that hasn't even been tested yet but I'll play...

The Ecoboost paired with a 10 speed and the GM 1500 series with the 6.2 and 10 speed are not capable of pulling my 9,500lbs trailer...neither platform is rated for the tongue weight (1500lbs). Neither of those powertrains have a rating in any configuration that is equal to the current 6.0 as tested under SAE J2807...let alone the new motor. Neither of those have a history of racking up 200,000 plus working miles. Neither was designed or deemed acceptable for HD use as neither of those powertrains were put in HD platforms by their respective manufacturer.

Originally Posted by Hersbird

All new design in 2020 and making your premier motor a 401 hp with a six speed. Seems like what the other guys did over 5 years ago.

401hp and a six speed auto will not top the list on paper...this is an important measurement for some folks. Considering this is the only information available and you are willing to make up your mind based solely on this, you should avoid this combination.

I'm thrilled with the manufacturers putting some new stuff out for the gas pullers and when it comes time for me to get a new truck I will drive all three of the HD platforms, do research and make a decision.

[elchilero53]

In the Max Tow configuration, both can pull 9500 lb trailers. If you have 1500 lb tongue weight, that is a bit on the heavy side but doable if the trucks are configured correctly. A 9000 lb trailer is used to test 1/2-ton trucks with Max Tow packages on the Ike Gauntlet every year. The 6.2L and 8-speed with the 3.42 rear end ties the Ecoboost and 10-speed every year. The 6.6L cast-iron block with an 8-speed and a 3.73 or a 4.10 rear end would be a terrific tow package.

[BigH]

Originally Posted by elchilero53

In the Max Tow configuration, both can pull 9500 lb trailers. If you have 1500 lb tongue weight, that is a bit on the heavy side but doable if the trucks are configured correctly. ...

No sir you are incorrect. There is no configuration rated for that load.

The maximum an F150 can handle for receiver tongue weight is 1320lbs per Ford...page 38 in their towing guide.
https://www.fleet.ford.com/resources...e_r2_Dec21.pdf


The maximum for the Chevy 1500 receiver is 1250lbs per Chevy...page 10 in their towing guide.
https://www.chevrolet.com/content/da...ring-guide.pdf