New Jeep 2.0T Hurricane 4 has complex tech [Engineering Explained]

[CorgiAttack]

And people will want to run this on 87 octane.

Volvo 2.0 T6 in 2016: 306 HP, 295 TQ in normal calibration. 324HP 354TQ Polestar software. Full warranty coverage. Ford Mustang 2.3L performance package, 332HP 350TQ, or 310/350 in base trim.

My last Mustang PP 2.3 made 340HP/378 TQ at the wheels on 91 octane, 380HP/422TQ throwing a 5 gallon can of unleaded race gas in it and bumping the programming to the calibration for it. On 91 octane it still hit 31 MPG when traveling.

This isn't new for 2.0 performance, it's a highly technologically advanced way of running an ICE. Historically, the highly advanced combustion cycle engines made by any manufacturer, did NOT end up being the most cost efficient high mileage versions of those engines. This kind of tech is NOT cheap.

It remains to be seen how it does but understand that F1 tech has never transferred well to passenger vehicles over the years. It's unnecessary tech for passenger cars in most respects. Having 4 overhead cam V8's with 32 valves is not as simple or inexpensive as a single cam pushrod V8 with 16 valves. Complex timing chains/belts versus MUCH simpler systems. Formula 1 tech is more complex, more expensive, more expensive to maintain. F1 tech is NOT for longevity, it's for specific output. They get to replace their engines during the season at a certain schedule.

It's cool, it's interesting from an engineering standpoint, it usually doesn't last as long as simpler designs. It costs more money to design, produce, maintain. You spend a lot of resources to then claim it's better on resources.

Having worked on complex engines for longer than Stellantis has been making them, I can say that there are things that will make this a lot more expensive to repair during the life of the vehicle. For people that are willing to spend a lot of money on vehicles, it's not an issue. For people looking to buy and keep a vehicle, this won't be something you want to own in 10 years. It will start burying you in upkeep unlike just buying an older tech vehicle and doing simple things to keep it running.

Not a luddite, I like tech, but not on passenger vehicles that are daily driver's. The more complex you make the plumbing, the easier it is to stop up the drain.

since they change the radio and dealer recommend use 91 to reduce the cliking sound that happened on 87

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[alphawolff]

Had a 2026 with 120 miles come into the shop this week with a smashed #3 pre-chamber plug. Was installed in the correct hole it seems, so who the hell knows what's going on

 

[Ratbert]

Had a 2026 with 120 miles come into the shop this week with a smashed #3 pre-chamber plug. Was installed in the correct hole it seems, so who the hell knows what's going on

How the hell can that happen? Shitty spark plug tolerances?

 

[alphawolff]

How the hell can that happen? Shitty spark plug tolerances?

Well, they added a spark plug check to the PDIs and there's the bulletin about them. The one we had came in with a dead miss on cylinder 3. Pulled the plug and the diode was smashed in enough to give zero gap. Luckily the plug didn't break or it would've required an engine replacement per the bulletin.

I'll laugh my ass off if they had the pre and main chamber plugs backward from the get-go and all the engines out there are backwards.

 

[alphawolff]

Another one came in today, ~200 miles and cylinder 1. one diode missing the other crushed in

 

[Dusty Dude]

Another one came in today, ~200 miles and cylinder 1. one diode missing the other crushed in

Are they making tolerances that tight that the piston is traveling too far up and smacking the electrode?

 

[Ratbert]

Another one came in today, ~200 miles and cylinder 1. one diode missing the other crushed in

Two failures. Hopefully your dealership has sold more than two!

 

[alphawolff]

Are they making tolerances that tight that the piston is traveling too far up and smacking the electrode?

Engineering is currently investigating

Two failures. Hopefully your dealership has sold more than two!

It's not like these are assigned to only me - I just happened to have two come into my shop and they both ended up assigned to me, another tech at my shop has seen a few apparently. If you factor in the shear randomness of that occurring it's possible this issue is very widespread

 

[srmitchell]

Engineering is currently investigating

It's not like these are assigned to only me - I just happened to have two come into my shop and they both ended up assigned to me, another tech at my shop has seen a few apparently. If you factor in the shear randomness of that occurring it's possible this issue is very widespread

Saw this come up a few weeks ago in the Mopar Tech Alliance page on FB. Glad I quit my Mopar tech job to become a high school teacher.

So what is your hypothesis? Plugs were installed wrong at the factory and there's mechanical interference? Or is this a detonation issue that is causing the plugs to fall apart?

What a nightmare... Between the 78c and this... lots of new engine issues.

 

[alphawolff]

Saw this come up a few weeks ago in the Mopar Tech Alliance page on FB. Glad I quit my Mopar tech job to become a high school teacher.

So what is your hypothesis? Plugs were installed wrong at the factory and there's mechanical interference? Or is this a detonation issue that is causing the plugs to fall apart?

What a nightmare... Between the 78c and this... lots of new engine issues.

My opinion is if the engineers previewed the engine to any field techs they would've had instant feedback as to why two sets of 4 spark plugs in a 4 cylinder is a stupid idea for a main product line engine.

Before the engine even hit the streets and us techs were doing the online overview of the engine we all saw the spark plug design/disclaimer and instantly knew it'd be a shit show.

So far we haven't even gotten into spark plugs installed incorrectly; they're just getting damaged during normal build and operation.

 

[Guv]

Are they making tolerances that tight that the piston is traveling too far up and smacking the electrode?

If that had happened it would’ve made one hell of a noise and had a dead cylinder from zero miles. Detonation is the likely cause of the J strap damage.

 

[gek]

My opinion is if the engineers previewed the engine to any field techs they would've had instant feedback as to why two sets of 4 spark plugs in a 4 cylinder is a stupid idea for a main product line engine.

Before the engine even hit the streets and us techs were doing the online overview of the engine we all saw the spark plug design/disclaimer and instantly knew it'd be a shit show.

So far we haven't even gotten into spark plugs installed incorrectly; they're just getting damaged during normal build and operation.

So you are saying the engineers are fallible

 

[yokramer]

So you are saying the engineers are fallible

I bet a spark plug or piston stabilizer will help

 

[Remorseless]

I bet a spark plug or piston stabilizer will help

If they nitrogen charge it we can just call it a hydraulic tensioner

 

[yokramer]

If they nitrogen charge it we can just call it a hydraulic tensioner

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