Mongoose has arrived new 8.3L GM

[yellowrosefarm]

18 hours ago, Mudfly said:

GM - 8.3L Duramax

Ford - Rumors of 8.0L Powerstroke

Ram - again rumors of 7.2L Cummins?

I like displacement as much as the next guy, but this seems a little extreme.  I could see it limited to 450/550 and 4500/5500 platforms.  But a 3/4 ton with 600 HP and 1400 lb feet of torque just seems like a recipe for disaster.  Most DL are limited to 26,000 combined weight, but the trucks have the HP and torque for a truck rated for 40k+.

 

 

Kind of like IH putting a 392 in a pickup back in the day?

[Mudfly]

2 hours ago, yellowrosefarm said:

Kind of like IH putting a 392 in a pickup back in the day?

A 392 with what 200 to 250 hp stock.  Now same truck with 600 hp stock and 1400 lb ft of torque.  I will say the brake are better now.

 

[yellowrosefarm]

9 minutes ago, Mudfly said:

A 392 with what 200 to 250 hp stock.  Now same truck with 600 hp stock and 1400 lb ft of torque.  I will say the brake are better now.

 

Just making the comparison that the 304/345/392 were medium duty truck motors put into pickups at that time.  The first Loadstar I ever drove had a 345, same as a later ScoutII. That's a big difference in GVWR between the two.

[Mudfly]

12 minutes ago, yellowrosefarm said:

Just making the comparison that the 304/345/392 were medium duty truck motors put into pickups at that time.  The first Loadstar I ever drove had a 345, same as a later ScoutII. That's a big difference in GVWR between the two.

Ah ha - I missed that connection.  Then yes, exactly like that.

 

[dale560]

550 hp and 1230 lb ft of torque. Just realeased info

[forwhldrv]

I have been very satisfied with my bone stock  6.6 duramax. In my 21 gmc. Give this one some time I’m game at buying one I know my 6.6 is thirsty pulling a trailer grossing around 30k. I’m sure with the numbers they are getting out of this it will be impressive in a pickup provided they can keep a  drive li e together behind it. There’s no replacement for displacement. 

[Sask466]

I don’t get the need for over 300-350ish hp in a diesel pickup/dually.  If you actually tow and need 500hp, Kenworth makes a good solution.

I don’t know where this is all headed, or why/how consumers continue to support this horsepower war.  

It’s not just paying for the horsepower new either - it’s affecting reliability - the 6.7l Cummins in 2019-2024 Rams is becoming a motor with a fairly bad reputation and one I would be afraid to own.  Premature roller cam lifter wear, turbo longevity, and catastrophic fuel system failures that can almost write a truck off.  

[Tad Wicks]

It's not to hard to add horsepower, now here in CA with $8.00 diesel how about moderate horsepower and something that gets 50mph, that would be more to my liking, of course, the lunies would find a way to ban that as well. Speaking of the 392, I worked for the local IH dealer back in the 70's, they had 2 IH 500's with the 2 speed axle golly what a workhorse they were.

[Matt Kirsch]

On 9/21/2026 at 6:31 PM, nate said:

Hopefully it’s better than the 6.2 disaster!

I'd sure hope so. That was about 40 years ago!

[dale560]

On 9/21/2026 at 5:31 PM, nate said:

Hopefully it’s better than the 6.2 disaster!

Just reading about the issues with 6.2. Seems the factory that machined crankshafts in mexico was doing shoddy work and cleaning. Then the connecting rod factory wasnt getting the rods oil galleys cleaned out. The grit was runni g right into the bearings on start up. That and some tolerances in other oil pressure holding areas like lifter bores were causing issues. Also the oil gm is using one variety they use has low shear tolerances. 

[dale560]

Videos of new engine and pickup package online now. One is of  the lead engineer discussing engine. They have gone to electronic controlled piston cooling jets. Solenoids are in oil pan, a variable displacement engine oil pump and two water to air charge coolers. One is a small round pre or quick cooler and th other is a more conventional square engine mounted. The reason for water to air cooler is more control on long hard pulls helps with exhaust temp. And torque response is better with shorter air path.

[Mudfly]

37 minutes ago, dale560 said:

Videos of new engine and pickup package online now. One is of  the lead engineer discussing engine. They have gone to electronic controlled piston cooling jets. Solenoids are in oil pan, a variable displacement engine oil pump and two water to air charge coolers. One is a small round pre or quick cooler and th other is a more conventional square engine mounted. The reason for water to air cooler is more control on long hard pulls helps with exhaust temp. And torque response is better with shorter air path.

What’s the reason for the variable oil squirters?  Are they trying to save parasitic losses or are they concerned about too much cooling at lower engine output?

The race for hp and torque seems to come at the cost of added complexity and lower reliability.

 

[Lazy WP]

All so they can pull their boat behind their 45 foot camper. 
I for one will be glad when we run out of recreation money. 
What we in the free world spend on recreation would support a family for a lifetime in third world nations. 
Don’t get me wrong, I enjoy being able to do things that I don’t normally do, but the money spent on hunting, fishing and camping just blows my mind!!

Again, I have a good running 6.7 in a Dodge dually. Do I need it? Probably not anymore. When I bought it, yes I was hauling 15 big cows, and had a 32 foot flatbed, and the big pickup was safer. And I like how it drives. 

[dale560]

35 minutes ago, Mudfly said:

What’s the reason for the variable oil squirters?  Are they trying to save parasitic losses or are they concerned about too much cooling at lower engine output?

The race for hp and torque seems to come at the cost of added complexity and lower reliability.

 

Better piston cooling at times was the reason. Can imagine problems when solenoids fail.

[Matt Kirsch]

22 hours ago, Matt Kirsch said:

I'd sure hope so. That was about 40 years ago!

Dummy me. I was thinking the DIESEL 6.2 which wasn't great, not the current gas 6.2...

[1967806]

12 hours ago, dale560 said:

Better piston cooling at times was the reason. Can imagine problems when solenoids fail.

Guessing they probably didnt build it so it was an easy to get to location to replace them either. 

[dale560]

7 minutes ago, 1967806 said:

Guessing they probably didnt build it so it was an easy to get to location to replace them either. 

Solenoids are in oil pan. But to get an oil pan off anything now is a major job.

[1967806]

3 minutes ago, dale560 said:

Solenoids are in oil pan. But to get an oil pan off anything now is a major job.

Had a Buick Ranier a few years ago. They told me one of the drive shafts to the front wheel went through the oil pan. 🤬I mean really?

[dale560]

The good thing is 15/40 oil is what this engine is going to use.

[Sask466]

The 6.2 (L87) runs a two-stage oil pump that drops to a low-flow state for fuel economy.

Pair that with a trans calibration that holds ~1,500 rpm under sustained high load on the highway, 11.5:1 compression, DFM, and factory 0W-20 — thinnest oil film you'll ever have, right where cylinder pressure is highest.

Then the parts: GM's recall cites sediment in the rods and crank oil galleries plus crankshafts out of spec on dimensions and surface finish.

Teardowns at I Do Cars and Dave's Auto Center both found damage on all eight rod bearings — even on a nearly-new engine.

Marginal film by design, plus bad journals that destroy what's left.

And the fix was 0W-40 and a new oil cap. NHTSA has since logged 499 complaints of engine failure after the remedy — 26 of those on trucks that already got brand new engines — and escalated to a full Engineering Analysis in August 2026 covering 997,743 vehicles.

 

[dale560]

5 minutes ago, Sask466 said:

The 6.2 (L87) runs a two-stage oil pump that drops to a low-flow state for fuel economy.

Pair that with a trans calibration that holds ~1,500 rpm under sustained high load on the highway, 11.5:1 compression, DFM, and factory 0W-20 — thinnest oil film you'll ever have, right where cylinder pressure is highest.

Then the parts: GM's recall cites sediment in the rods and crank oil galleries plus crankshafts out of spec on dimensions and surface finish.

Teardowns at I Do Cars and Dave's Auto Center both found damage on all eight rod bearings — even on a nearly-new engine.

Marginal film by design, plus bad journals that destroy what's left.

And the fix was 0W-40 and a new oil cap. NHTSA has since logged 499 complaints of engine failure after the remedy — 26 of those on trucks that already got brand new engines — and escalated to a full Engineering Analysis in August 2026 covering 997,743 vehicles.

 

Gm should have seen this coming. Toyota had a big engine problem also from machining debris and fit. 

[searcyfarms]

i have a 6.7 cummins sittin in the shop on a pallet, got it for partial payment on a job and maybe i should put it in a prius for all the haters 

could call it the prummins ? 

if you guys need a good 6.7 you probably could use it quicker than i will get to the prius project 

[Sask466]

3 minutes ago, dale560 said:

Gm should have seen this coming. Toyota had a big engine problem also from machining debris and fit. 

Yeah it’s pretty wild to think these seem to be doomed engines, when 15yrs ago a 6.0LS would do 250,000miles+, with relative ease.  

It’s sort of a story of a bunch of issues stacking up on each other.  I do wonder - if a new engine was put together surgically clean, would it still fail prematurely?  My gut says it probably will?

Also the internet has a way of amplifying these issues, but I think this one is real. 

[lotsaIHCs]

1 hour ago, dale560 said:

Gm should have seen this coming. Toyota had a big engine problem also from machining debris and fit. 

So did Hyundai/Kia. And then there was the disaster of an engine that the Nissan Cummins V8 became. Those were junk from the factory. As for the 6.2 GM, what a shame after the early LS engines would run 250K+ in most cases. Mine only has 208,XXX on it so far. Heck even my old TBI 5.7 went 250K miles.

[dale560]

Shouldn’t say this on here but ihc years ago in one of the pre war series was having engine troubles also and it was traced to machining debris in engines made in Louisville plant if I remember right.