2020 Chevy 2500HD 6.6 Gaseser data.

[ls1mike]

The whole video discusses the Duramax and chassis as well.

But the beginning discusses the new 6.6 which I am interested in it to replace my 6.0 gasser. I don't really need a diesel and only use my trucks to tow.
2020 GM 2500HD

I like the stainless steel exhaust manifolds. I can't think of any other gasser with that from the factory. Should be helpful with heat cycles.
I wish it looked better not a fan of the looks, but I like the sound of the drivetrain.

[ksss]

mtofell1 wrote:
My only request is that manufacturers stop sizing engines the same as one of their past engines so we all know what is being referred to.

Old Ford 7.3 diesel - New Ford 7.3 gas
Old Chevy/GMC Duramax 6.6 - New Chevy/GMC 6.6 gas

Message boards are going to be full of confusion for the next 20 years.

Of course, I know the manufacturers have more to worry about than message boards but it is kind of funny they do this. You have to figure there will be plenty of confusion when various people are talking about the engines.

I thought the same thing.

[mtofell1]

My only request is that manufacturers stop sizing engines the same as one of their past engines so we all know what is being referred to.

Old Ford 7.3 diesel - New Ford 7.3 gas
Old Chevy/GMC Duramax 6.6 - New Chevy/GMC 6.6 gas

Message boards are going to be full of confusion for the next 20 years.

Of course, I know the manufacturers have more to worry about than message boards but it is kind of funny they do this. You have to figure there will be plenty of confusion when various people are talking about the engines.

[dodge_guy]

ls1mike wrote:

SoonerWing03 wrote:
Any guesses as to the expected fuel economy for this engine?

Bad? Probably not much different than the current 6.0 15ish empty 7-9ish towing.
I know it matters to some who daily drive it, but I am not buying a tow vehicle for MPGs and I don't daily drive my truck.

How is that bad for a towing motor? Sounds like it is going to be better all sound. All 3 manuf are going to new bigger gas motors, which tells a lot about the future of diesel! The diesel has been milked for all it can....to the point they can’t get them to pass emissions without playing with the software!

[Huntindog]

Lessmore wrote:

Jayco23FB wrote:
I was interested in the 6.6 gasser to replace my 6.0 as well until I found out the 6.6 gas will have siamesed cylinders. I remember all the overheat problems the small block 400 had using siamesed cylinders. I think I will pass on this one.

Pretty sure hot rodders had found a fix for this by the late '90's.

Yes they did, it was a 383.

[Lessmore]

Jayco23FB wrote:
I was interested in the 6.6 gasser to replace my 6.0 as well until I found out the 6.6 gas will have siamesed cylinders. I remember all the overheat problems the small block 400 had using siamesed cylinders. I think I will pass on this one.

Pretty sure hot rodders had found a fix for this by the late '90's.

[Jayco23FB]

I

[RCMAN46]

In today’s engines siamesed cylinders should not be a problem.

Even the all mighty 6.7 Cummins has siamesed cylinders.

[ls1mike]

SoonerWing03 wrote:
Any guesses as to the expected fuel economy for this engine?

Bad? Probably not much different than the current 6.0 15ish empty 7-9ish towing.
I know it matters to some who daily drive it, but I am not buying a tow vehicle for MPGs and I don't daily drive my truck.

[SoonerWing03]

Any guesses as to the expected fuel economy for this engine?

[ls1mike]

SARGUY wrote:
Can you explain the term siamesed cylinders,TY.

the cylinders have no way for coolant to flow between them.

This engine is siamesed but allows for coolant to flow between them.

It just increases the strength of the block overall.

[ls1mike]

ksss wrote:

Jayco23FB wrote:
I was interested in the 6.6 gasser to replace my 6.0 as well until I found out the 6.6 gas will have siamesed cylinders. I remember all the overheat problems the small block 400 had using siamesed cylinders. I think I will pass on this one.

This motor is not going to overheat. Comparing the small block 400 to the 6.6 siamesed cylinders or not is ridiculous, sorry but it is. The 6.6 will replace the 6.0 and so the shoes to fill are huge, and GM is certainly aware of that. They are not going to release this motor that has been years in the making, and be used in HD pickups if it overheats. It will be dialed in and ready to pickup where the 6.0 leaves off.

I am guessing if your condemning a motor that has not even hit the ground yet, by comparing it to one built 40 years ago, your really not in the market anyway.

Also the cooling jackets between the cylinders are connected. It will be fine, it is nothing like a 400. I do find the high pressure full pump interesting as it is mechanical.

[ksss]

Jayco23FB wrote:
I was interested in the 6.6 gasser to replace my 6.0 as well until I found out the 6.6 gas will have siamesed cylinders. I remember all the overheat problems the small block 400 had using siamesed cylinders. I think I will pass on this one.

This motor is not going to overheat. Comparing the small block 400 to the 6.6 siamesed cylinders or not is ridiculous, sorry but it is. The 6.6 will replace the 6.0 and so the shoes to fill are huge, and GM is certainly aware of that. They are not going to release this motor that has been years in the making, and be used in HD pickups if it overheats. It will be dialed in and ready to pickup where the 6.0 leaves off.

I am guessing if your condemning a motor that has not even hit the ground yet, by comparing it to one built 40 years ago, your really not in the market anyway.

[ls1mike]

Jayco23FB wrote:
I was interested in the 6.6 gasser to replace my 6.0 as well until I found out the 6.6 gas will have siamesed cylinders. I remember all the overheat problems the small block 400 had using siamesed cylinders. I think I will pass on this one.

The LS7, the C5Rs (24 hours of Daytona Winner), and the performance LSX bowtie block used in tons of race applications all have siamesed cylinders. They don't have the issues of the 400. This isn't 1985. 🙂

[jake2250]

KW/00 I follow your thoughts. Only two of us and we tow what fits us comfortably.
Both financially and mechanical wise!
Had a diesel but didn't really need it. Liked it, but didn't really need it.
I am so amazed what all trucks have evolved into. I love this time and age.
Can't believe the thinking, amount of money and busted knuckles to get where in time we are now!
400 hp and a six speed transmission! I would have NEVER thought that was even in the cards when we started pulling trailers in the early nineties, let alone the comfort of vehicle and camper that is available today!
My trailer is 13 years old and we are Very comfortable in it. My truck is 7 years old and seems Old compared to today's market!