Hurricane HEMI?

[PolarisCobra]

I have not looked too closely at the design of the Hurricane engine. I assume that it does not have a 'HEMI' design in the heads. My questions is - could it have been a HEMI? Should it be a HEMI? Does it make any sense in an in-line six configuration compared to a V8?

If it was good for the V8, why is it not good in the I6?

 

[markabby]

I had a 1938 Dodge once with a flat head 6. It was unbeatable and that car would cruise at 65 without a problem.

why didn't they keep it?

 

[Jrod]

I was die hard HEMI since 2005, but through circumstance I landed in a new 2025 Laramie with the inline six SO. The engine has surpassed all of my expectations, except sound. It does not have that V8 rumble, but it does have more HP, more torque, more responsive, and better MPG. I have not found any data suggesting whether or not it has hemispheric cylinders. The engine has been utilized in the new Grand Wagoneer, so it's been out for a few years.

 

[HEMIMANN]

Hemi cylinder heads only benefit race rpm engines.

It was just a marketing gimmick (that worked, except for adequate camshaft lubrication and durability, that is).

The Hurricane is a modern engine that is too small displacement, IMO. Even Ford's Ecoboost 3.7L is bigger. It's being pushed too hard if loaded or towing. If people buy a truck for some kind of identity statement for getting groceries only, it will work. It won't last as a true truck engine.

The Hemi's DISPLACEMENT (size) is what made it run like a truck engine. The Hellcat was supercharged - i.e., a true race engine - not meant to run 200,000 miles loaded.

There. You're welcome.

 

[DanAR]

The Hemi head design while good for power, is not ideal for emissions. And, with turbo/super charging, the head chamber design is a less important factor in making power. The Hemi chamber design promoted moving air in and out of the chamber in both naturally aspirated and forced air systems. But for the street with emissions, up to 28 lbs of boost with forced air induction and still meet emission standards.

Since it has a 4-valve head it’s chamber is probably more of a pentroof chamber design which is still kind of a close relative of the Hemi.

 

[Docwagon1776]

I6 has a lot of natural advantages in terms of balance and NVH as well as reduced complexity. You only have one of a lot of components a V configuration requires two of. Several of the old hobbles for I motors have been solved by technology advancing over the years. Fuel injection solves the issue of the furthest cylinders not getting a good fuel/air mix. The biggest issue is clamping force required to keep the head in place in the center. Modern materials allows for much higher cylinder pressure without blowing out gaskets...and these motors are taking every bit of that advantage. The cylinder pressure under boost is...significant.

Stellantis is apparently betting the farm on the Hurricane concept and the physical size of it letting it fit in more things is a benefit to them. Weight reduction, etc. make it suitable for more platforms as well. I still say it's a natural fit for the Gladiator and would bump sales of a flagging model if they'd do it.

 

[HEMIMANN]

I6 has a lot of natural advantages in terms of balance and NVH as well as reduced complexity. You only have one of a lot of components a V configuration requires two of. Several of the old hobbles for I motors have been solved by technology advancing over the years. Fuel injection solves the issue of the furthest cylinders not getting a good fuel/air mix. The biggest issue is clamping force required to keep the head in place in the center. Modern materials allows for much higher cylinder pressure without blowing out gaskets...and these motors are taking every bit of that advantage. The cylinder pressure under boost is...significant.

Stellantis is apparently betting the farm on the Hurricane concept and the physical size of it letting it fit in more things is a benefit to them. Weight reduction, etc. make it suitable for more platforms as well. I still say it's a natural fit for the Gladiator and would bump sales of a flagging model if they'd do it.

And torque ability with individual crank bearings. BUT - it still has gasoline as a fuel with spark plugs. Such an engine is pressure limited and needs rpm to compensate. What rpm do race engines run?

Hint: not at passenger vehicle engine rpms.

If you like paying 50% more for vehicles lasting 50% less, have at it. Not me.

 

[Burla]

Charge more and lasts less about sums it up, nobody prices have gone up higher then stelantis and this just scratches the surface, next 4-5 years they will be on an island. Kind sad considering they aren't known for quality with any of their brands.

 

[HEMIMANN]

Wow lookit Hyndai go! lol

A buddy bought a Ford 150 with 3.7L ecoboost and likes it. I haven't ridden in it yet.

 

[star_deceiver]

The Hurricane is a modern engine that is too small displacement, IMO. Even Ford's Ecoboost 3.7L is bigger. It's being pushed too hard if loaded or towing.

Pushed too hard? It’s a half ton truck. My Pentastar can handle 6000lbs at half the torque output.

Now if that inline 6 doesn’t have 7 main bearings or the cooling system is poorly designed or owners don’t know how to cool a turbo after hauling…

 

[HEMIMANN]

Pushed too hard? It’s a half ton truck. My Pentastar can handle 6000lbs at half the torque output.

Now if that inline 6 doesn’t have 7 main bearings or the cooling system is poorly designed or owners don’t know how to cool a turbo after hauling…

What do you know about bearing loads over time and wear rates?

Did you read what I said about peak torque versus engine wear rates? A Top Fuel Dragster produces over 10,000 horsepower - for avg. 36 second engine life.

Is that what you want? For $70,000 and a 10 year loan?

 

[Scottly]

True hemispherical combustion chambers were great...in the sixties. IMO, if you want to see a great head design, go look at what Yamaha did with the Ford SHO Taurus some years back....5 valves, lots of go power.

 

[Docwagon1776]

Pushed too hard? It’s a half ton truck. My Pentastar can handle 6000lbs at half the torque output.

Now if that inline 6 doesn’t have 7 main bearings or the cooling system is poorly designed or owners don’t know how to cool a turbo after hauling…

No idea on the main bearings. The Hurricane does not require any owner intervention for turbo cooldown, though. It is using electric pumps to continue to cool the turbo (if needed) even with the engine shut off. Modern synthetic oils are also much more resistant to heat coking, making it less of an issue than in the past.

 

[HEMIMANN]

No idea on the main bearings. The Hurricane does not require any owner intervention for turbo cooldown, though. It is using electric pumps to continue to cool the turbo (if needed) even with the engine shut off. Modern synthetic oils are also much more resistant to heat coking, making it less of an issue than in the past.

Torque is a function of cylinder pressure and rpm, yes? If you take a smaller displacement engine an put the same torque through it, the unit loading on the surfaces is much higher, yes? You can throw all the lubrication you want at it, this engine will wear out faster. Look at the extreme top fuel engine example.

 

[PA Ram]

Next truck will be a 2500. I tow a 30 ft travel trailer with my 2017 Ram 1500 5.7 and loaded it's probably about 6500lbs. I will probably move to a slightly bigger travel trailer which my hemi will probably still tow fine,but I'll probably switch to the 6.4 2500. I only have 66,000 miles on my truck so not getting a new one anytime soon.

 

[Kickboxer]

I have not looked too closely at the design of the Hurricane engine. I assume that it does not have a 'HEMI' design in the heads. My questions is - could it have been a HEMI? Should it be a HEMI? Does it make any sense in an in-line six configuration compared to a V8?

If it was good for the V8, why is it not good in the I6?

Don't get hung up on the word Hemi...........

 

[Marshall]

I had some hemi's in the 1950's great motor, low speed truck motors that pulled good. big and heavy , one had 400,000 miles in a grain truck.
Never had a 426, but rode in one. Something you don't forget, along with a 1957 Stud. golden hawk. First car that scared me with power.
Old flat head motors is old combines up till the 1960's run forever, but nice steady RPM around 2500 I think.
All the 6 cylinders I owned, never need any work, other then one valve grind. 1949 Fargo, still running
Mind you ,I can same the same with all the V8's I have had, never had one crap out, other then chains, and some gaskets.
Transmissions did a few.

 

[HEMIMANN]

Hemis were developed to race at high rpm with better airflow from siamese valve orientation.

They aren't truck motors. The fact they stuffed them into trucks and marketed the $hit outta them changes nothing. Physics is.

How many GD times I gotta say this?

 

[jmr]

This is what the 3.0 Hurricane chamber looks like.

 

[star_deceiver]

What do you know about bearing loads over time and wear rates?

Is that what you want? For $70,000 and a 10 year loan?

Wear happens when there’s physical contact between metal surfaces caused by insufficient lubrication. Can the 3L survive long periods of max torque? I couldn’t tell you. Haven’t seen one pulled apart, yet. Give it time, we’ll see the results of someone unhappy here.

$60k over 3 years, max. I won’t pay more, or over any longer term.