Jump to content

Larger Gasoline Engine Option

C/K Man
 Share

Recommended Posts

C/K Man Enthusiast

C/K Man

Posted
Posted

No question the L8T 6.6L is a worthy successor to the L96 6.0L.  It is very close in output to the Ford 7.3L and seems to deliver better fuel economy.  Nonetheless for the last couple of years there has been persistent rumors that GM is considering an even larger gasoline V-8, possibly primarily for larger commercial trucks and other OEM's.  For the last 6 months or so the rumors have died down a bit, but recently something showed up on GM Powertrain's website that has me wondering.  What it is is a 454 cubic inch V-8 based on the LS family using the tall deck LSX high performance engine block.  Now before you say that engine is old news and is just a high performance (and expensive) crate engine, the engine I am talking about is a different one.  This one is a nearly completely dressed production engine that appears to use L96 intake, throttle body, and heads.  In fact, the extra row of head bolts on the LSX block are visible but not used as they would be with LSX style heads.  Defiantly a truck/commercial engine, and the website lists it as an 'OEM Test Unit' whatever that means.  Could this be the rumored larger gasoline V-8?:

 

      https://gmpowertrain.com/products/lsx-454-engine/

XY74 Enthusiast

XY74

Posted
Posted

Premium fuel recommended, doesn't sound like something you would hear for a fleet truck engine.

  • Like 2
Pastusak.t Enthusiast

Pastusak.t

Posted
Posted
3 hours ago, XY74 said:

Premium fuel recommended, doesn't sound like something you would hear for a fleet truck engine.

I was thinking the same thing. But I would love 500+ ft lbs on a gasser for towing. 

C/K Man Enthusiast

C/K Man

Posted
  • Author
Posted

Yes, the compression ratio is high, but why the 6.0L sized truck intake manifold and throttle body?  The engine makes no sense unless it is built for some specific purpose.  The high compression ratio would be appropriate for CNG/LNG, but the stated fuel is gasoline.  And what does 'OEM Test Unit' mean?

newdude Senior Enthusiast

newdude

Posted
Posted
10 hours ago, C/K Man said:

No question the L8T 6.6L is a worthy successor to the L96 6.0L.  It is very close in output to the Ford 7.3L and seems to deliver better fuel economy.  Nonetheless for the last couple of years there has been persistent rumors that GM is considering an even larger gasoline V-8, possibly primarily for larger commercial trucks and other OEM's.  For the last 6 months or so the rumors have died down a bit, but recently something showed up on GM Powertrain's website that has me wondering.  What it is is a 454 cubic inch V-8 based on the LS family using the tall deck LSX high performance engine block.  Now before you say that engine is old news and is just a high performance (and expensive) crate engine, the engine I am talking about is a different one.  This one is a nearly completely dressed production engine that appears to use L96 intake, throttle body, and heads.  In fact, the extra row of head bolts on the LSX block are visible but not used as they would be with LSX style heads.  Defiantly a truck/commercial engine, and the website lists it as an 'OEM Test Unit' whatever that means.  Could this be the rumored larger gasoline V-8?:

 

      https://gmpowertrain.com/products/lsx-454-engine/

 

 

You won't see this in the HD pickups as we've moved on to Gen 5 LT engines.  

C/K Man Enthusiast

C/K Man

Posted
  • Author
Posted
7 hours ago, newdude said:

 

 

You won't see this in the HD pickups as we've moved on to Gen 5 LT engines.  

Agree.  Maybe in medium duty with a lower compression ratio.  Port injection is easier to convert to gaseous fuel, though there CNG conversions of LT 5.3L's.  I just wonder what the purpose of this LX 454 engine is.

newdude Senior Enthusiast

newdude

Posted
Posted
32 minutes ago, C/K Man said:

 I just wonder what the purpose of this LX 454 engine is.

 

Hopefully to end up in my dream project LS swap 1988-98 truck lol.

  • Like 2
  • 3 months later...
pokismoki Senior Enthusiast

pokismoki

Posted
Posted
On 1/6/2021 at 6:08 AM, 2020-2500 said:

I just wish someone would make a supercharger for the new 6.6 gas.  Seems like there is plenty of room for one.

6.2 supercharger parts wont fit ?  the ecm  is probably harder to tune or has more encryption which yet to be cracked

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • KARNUT
      Post Pics of your "Other" Rides

      By KARNUT · Posted

      Well one of our most reliable vehicles was sold yesterday. The first and only I gave for free to a grandkid. If they got skin in the game they take care of it. My wife bought new. Five years later my daughter got it to use. We got it back and gave it to our grandson after graduation. He did zero maintenance just oil changes. When the AC quit he drove his mother’s car rather than get it fixed. Instead he just bought a beater and sold the Elantra. 
    • KARNUT
      OCI, not when but why?

      By KARNUT · Posted

      I usually do as well or better than the sticker for mileage. Usually better going west than east. North then South. Wind makes a difference. I’m not usually a conspiracy theorist. But it did dawn on me I’m going by the vehicle calculation. Now that would be interesting.
    • Grumpy Bear
      OCI, not when but why?

      By Grumpy Bear · Posted

      https://www.msn.com/en-us/autos/news/fuel-economy-stickers-don-t-tell-the-whole-story-aaa-data-reveals-why/ar-AA26ocHk?ocid=winp2fptaskbarhover&cvid=6a4122ea3dae47e5b8dfbed5d4fd3d55&cvpid=648f6b4fc2fa4eddb4c12893aeb957ed&ei=59
    • KARNUT
      OCI, not when but why?

      By KARNUT · Posted

      What’s missing in all this is patience and investment in the future. Buy a 170K starter home. Ten years later sell it invest in a more expensive home. Eventually you’ll have a 600K home and pay starter home payments. Buy a starter car. Maintain it well. Save the payments after it’s payed for then buy an expensive car if you desire. Buy a tumbler make your own coffee, pack your lunch. Cook your own dinner. Most importantly take care of your car.
    • Atlas
      OCI, not when but why?

      By Atlas · Posted

      People mislead themselves. Statistics are highly useful indicators.   Here's the tie-in to this thread. If an oil sample tests shows a wear indicator of 7 using cheaper ACDelco oil, and a wear indicator of 2 (lower = less wear) using a particular brand of Mobil oil, and wear has a linear relationship with engine lifespan, anyone could assume that Mobil is reducing wear by more than 50% (let's just say a 200% reduction for you red state people trying hard to do math) which leads to increasing engine life by 2x. Perhaps, in a vacuum, by itself, when dreamed by AI.   Yeah?! That's what the statistic is saying, isn't it?   No, it isn't. It didn't come out and say engine life is doubled. That's a very bad assumption, and a case of severe myopia by assuming something potentially untrue about the only data point in focus.   Average cost of a new car is 50k. You bet it is.   The median cost of a new car is more like 35k. Expensive cars are skewing the perception that "average" now means a $50k price of entry for a very average automobile. And that's not true. People who don't understand statistics twist the living heck out of them to mean all sorts of things they don't actually mean.   "Average" new car payment is $1000/month. Yep, it is. And in that number are all the $35k new car buyers who bring significant equity, and the $25k new car buyers who finance the car for a month just to get a rebate, and then pay it off. Know what isn't in that number? All the payments made by people who don't finance a car.   Picking one's own data point (don't have a car payment, never paid $50k for a new vehicle, my house cost $170k, I afforded a middle class lifestyle on $4.50/hr) is just a data point. Just like earning $25/hr in an area where the median home price is almost $1 Million is a data point. In fact, it's a lot of data points given that 80% of the US population lives in/around major cities. They're not idiots; the vast majority of them do it to make a living because that's where the big money is.   The highs have become higher, lows have become lower, and how your personal mileage varies is not truth for an entire country. At the same time you can't NOT acknowledge the data. While it doesn't paint YOUR personal picture, it certainly tints the reality that you also live in, as does your single data point.    

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...