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Drew Dowdell

Cadillac News: Cadillac Releases Details on New V6 Engine Family

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Cadillac released details for two of the engines that will be offered in the 2016 Cadillac CT6 today. While both engines share familiar displacements with existing engines at Cadillac and the rest of GM, these new engines are launching an all new engine architecture for Cadillac.

First up is the all-new 3.6 liter, naturally-aspirated V6. The headline features of the new 3.6 are Active Fuel management and stop/start technology. The Active Fuel Management cuts two of the cylinders during light throttle conditions to save fuel. During idle, vehicles with cylinder deactivation typically need to run all cylinders to maintain expected refinement. The new 3.6 resolves that issue by adding automatic start/stop. These combined technologies contribute to an up to 9% increase in fuel economy.

Also helping with fuel economy is a new cylinder head design. Intake and exhaust valves are 6% larger and that helps to increase fuel mixture and flow. The new cylinder head and combustion chamber design allow for better low-end torque.

An all new cooling system send coolant evenly around each cylinder rather than the typical flow back process used today. This allows the water jackets in the head and block to be smaller which also allows for a smaller water pump and less coolant. The smaller water pump requires less energy to drive but when combined with the new cooling system allows for faster warm up and more evenly distributed cooling.

Cadillac benchmarked the Infiniti 3.7 liter V6 for quietness and refinement. Using a new cam drive system, a stiffer aluminum block, a 2 stage oil pump, and stiffened structural oil pan all come together to bring the new 3.6 to be up to 4dB quieter at idle.

The new 3.6 V6 is SAE certified at 335 horsepower and 284 lb-ft of torque, up from 321 horsepower and 275 lb-ft in the current 3.6.

This engine will be a Cadillac exclusive engine at launch and for some time after.

Also gaining all of those improvements and more is a new 3.0 Twin-Turbo V6. At launch, the 3.0 TT will be the only engine made that combines turbo-charging, start-stop, and cylinder deactivation into a single engine.

The turbo chargers are similar to the ones used in the Cadillac ATS-V. They are low-inertia units that allow for fast spooling and very low throttle lag.

This new TTV6 is estimated to produce 400 horsepower and 400 lb-ft of torque which gives it one of the highest horsepower per liter ratings (133 hp/l) of any DOHC V6. The 400 horsepower rating puts Cadillac's new 3.0TT while above the output of the BMW 740i (315hp) and Audi A7 3.0 S/C (310hp).

The 3.0TT will remain a Cadillac exclusive.

Both engines will be built at GM's Romulus Powertrain Facility outside of Detroit Michigan and will each be paired with new 8-speed automatics which we will detail in another article.

Watch our 2015 New York Auto Show category for more information on the Cadillac CT6.

Source: Cadillac Media

Cadillac Press Releases on Page 2 and 3

Click here to view the article

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The 3.6 peak power is again at 6800 rpm, the current V6 makes peak torque at 4800 rpm, the new one is at 5300.  So you really have to rev the crap out of that engine to get the power from it, which was always something I didn't like about the Gen 2 CTS or the Infiniti G37.  Unless you are above 4,000 RPM those cars have no power.

 

The twin turbo makes good power, that is a proper engine for Cadillac.  What is curious is they compare it to the A7 and 740i, so is that the target competition for the CT6?  If so, Cadillac does realize those cars offer a V8 right? 

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Cadillac benchmarked the Infiniti 3.7 liter V6 for quietness and refinement. Using a new cam drive system, a stiffer aluminum block, a 2 stage oil pump, and stiffened structural oil pan all come together to bring the new 3.6 to be up to 4dB quieter at idle.

 

Why on earth would you benchmark the loudest engine in the entry-moderate level luxury segment for your high end luxury car?  And an engine that came out in 2008 and hasn't changed since.  Shouldn't they benchmark a Lexus LS460 or something for refinement?

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The 3.6 peak power is again at 6800 rpm, the current V6 makes peak torque at 4800 rpm, the new one is at 5300.  So you really have to rev the crap out of that engine to get the power from it, which was always something I didn't like about the Gen 2 CTS or the Infiniti G37.  Unless you are above 4,000 RPM those cars have no power.

 

The twin turbo makes good power, that is a proper engine for Cadillac.  What is curious is they compare it to the A7 and 740i, so is that the target competition for the CT6?  If so, Cadillac does realize those cars offer a V8 right?

 

These aren't the only engines for the CT6, just the newest ones to talk about. 

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Cadillac benchmarked the Infiniti 3.7 liter V6 for quietness and refinement. Using a new cam drive system, a stiffer aluminum block, a 2 stage oil pump, and stiffened structural oil pan all come together to bring the new 3.6 to be up to 4dB quieter at idle.

 

Why on earth would you benchmark the loudest engine in the entry-moderate level luxury segment for your high end luxury car?  And an engine that came out in 2008 and hasn't changed since.  Shouldn't they benchmark a Lexus LS460 or something for refinement?

 

 

The LS460 is a V8.  Apples/Oranges. 

 

There is a difference between engine loudness and engine loudness that you can hear from inside the car. 

 

From auto-decibel-db.com - rating at idle

2009 Infiniti G37 3.7 - 38.5

2012 Infiniti JX 3.5 - 41.0

2012 Infiniti M37 - 42.9

Lexus 3.5 - 40.9

2013 Cadillac 3.6 - 42.4

Buick 3.6 - 41.4

Audi 3.0 - 42.9

Mercedes E350 - 38.2

Jaguar 3.0 V6 - 44.4

Acura RLX 3.5 - 39.5

BMW 535i - 42.8

 

If Cadillac did as they claim and shaved 4dB off of the Infiniti number, that would make them extremely class-leading no matter which Infiniti model they started from. At worst, it would put the new 3.6 in the 37 dB - 38 dB range. At best, it would be in the 34 dB range (which I doubt they'd hit)

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Why is that 3.6 even in the CT6?  Unless the CT6 is replacing the XTS in a sense and they need and entry level model around $50k for the fleets and old people.  While they are making "all new" engines, where is the V8?  Look across the automotive landscape and no one is selling a sedan with a naturally aspirated V6 for over $50k with the exception of the E-class which is losing the 3.5 liter V6 after this year.   The GS350, Q70 and RLX are all $48k.

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Cadillac benchmarked the Infiniti 3.7 liter V6 for quietness and refinement. Using a new cam drive system, a stiffer aluminum block, a 2 stage oil pump, and stiffened structural oil pan all come together to bring the new 3.6 to be up to 4dB quieter at idle.

 

Why on earth would you benchmark the loudest engine in the entry-moderate level luxury segment for your high end luxury car?  And an engine that came out in 2008 and hasn't changed since.  Shouldn't they benchmark a Lexus LS460 or something for refinement?

 

 

The LS460 is a V8.  Apples/Oranges. 

 

There is a difference between engine loudness and engine loudness that you can hear from inside the car. 

 

From auto-decibel-db.com - rating at idle

2009 Infiniti G37 3.7 - 38.5

2012 Infiniti JX 3.5 - 41.0

2012 Infiniti M37 - 42.9

Lexus 3.5 - 40.9

2013 Cadillac 3.6 - 42.4

Buick 3.6 - 41.4

Audi 3.0 - 42.9

Mercedes E350 - 38.2

Jaguar 3.0 V6 - 44.4

Acura RLX 3.5 - 39.5

BMW 535i - 42.8

 

If Cadillac did as they claim and shaved 4dB off of the Infiniti number, that would make them extremely class-leading no matter which Infiniti model they started from. At worst, it would put the new 3.6 in the 37 dB - 38 dB range. At best, it would be in the 34 dB range (which I doubt they'd hit)

 

But that is how you get ahead, you benchmark your $60,000 car to be better than Lexus's $80,000 car, not Infiniti's $40,000 car.  Funny how the Mercedes 3.5 liter is the quietest on that list when it is the oldest engine in the M-B lineup and being phased out next year.

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Cadillac benchmarked the Infiniti 3.7 liter V6 for quietness and refinement. Using a new cam drive system, a stiffer aluminum block, a 2 stage oil pump, and stiffened structural oil pan all come together to bring the new 3.6 to be up to 4dB quieter at idle.

 

Why on earth would you benchmark the loudest engine in the entry-moderate level luxury segment for your high end luxury car?  And an engine that came out in 2008 and hasn't changed since.  Shouldn't they benchmark a Lexus LS460 or something for refinement?

 

 

The LS460 is a V8.  Apples/Oranges. 

 

There is a difference between engine loudness and engine loudness that you can hear from inside the car. 

 

From auto-decibel-db.com - rating at idle

2009 Infiniti G37 3.7 - 38.5

2012 Infiniti JX 3.5 - 41.0

2012 Infiniti M37 - 42.9

Lexus 3.5 - 40.9

2013 Cadillac 3.6 - 42.4

Buick 3.6 - 41.4

Audi 3.0 - 42.9

Mercedes E350 - 38.2

Jaguar 3.0 V6 - 44.4

Acura RLX 3.5 - 39.5

BMW 535i - 42.8

 

If Cadillac did as they claim and shaved 4dB off of the Infiniti number, that would make them extremely class-leading no matter which Infiniti model they started from. At worst, it would put the new 3.6 in the 37 dB - 38 dB range. At best, it would be in the 34 dB range (which I doubt they'd hit)

 

But that is how you get ahead, you benchmark your $60,000 car to be better than Lexus's $80,000 car, not Infiniti's $40,000 car.  Funny how the Mercedes 3.5 liter is the quietest on that list when it is the oldest engine in the M-B lineup and being phased out next year.

 

 

There is little point benchmarking a V8 against a V6 and vice versa.   But since you insist...

 

Lexus GX460 - 42.3 (I can't find a non-hybrid LS entry)

Lexus LS600h L - 41.2

 

In any case, there is so little difference between all of these. For reference, 35db is virtually library silent. 

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But that is how you get ahead, you benchmark your $60,000 car to be better than Lexus's $80,000 car, not Infiniti's $40,000 car.  Funny how the Mercedes 3.5 liter is the quietest on that list when it is the oldest engine in the M-B lineup and being phased out next year.

 

 

You benchmark to be quieter than quietest, not quieter than the sound of the more expensive car. Possibly E350 was not benchmarked because it is being phased out and the new turbo Benz is possibly louder than the E350. And 4db is still greater than 0.3 db difference.

 

I am not a fan of the 3.6 N/A as I have said in the past, Cadillac should use a turbo engine to replace the 3.6 NA, but don't challenge intelligence just to find faults.

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Again, lets keep in mind that 35 dB should be considered "ignition off". So 36 dB is the absolute lowest limit for any gasoline engine at idle unless you bring in technology like active noise cancellation. Anything between 37 and 38 is class leading.   If Cadillac's claim is true, then they will have the quietest engine on the market. 

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This is again typical GM lack or failure of PR and Marketing.

 

You are bringing a car that is going to be the most expensive car in the lineup and you showcase engines for the car that are weaker than the strongest engine of the lesser car.

 

Not good for people like SMK who are already baying Cadillac's blood for failure. Either bring the biggest phallus for the bacchanal or don't show off at all. Set the foot right Johan and Ewe. But then again, expecting something like that from them is asking for sending man on Saturn.

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GM has proven the ability to build class leading engines with HP and Torque equal to or greater than HP. Now they show off an engine like this on a new auto. This is the one time I wish Cadillac had kept their mouth shut till the full engine line was ready for the CT6 and then start off with V8, Diesel, V6 and Alternative fuel.

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Thought about it a bit more.  In this class, it doesn't matter who Cadillac benchmarked.  If they made it into the 37 dB - 38 db range, they will have just about maxed out.   There is a lower limit to idle quietness and that limit is 35 db  (A Lexus LS600h L which is powered on but without the gas motor running is 35.5 dB).  There simply is no way to do better.

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Sound at 60 or 70 mph I think matters note than idle. How often do cars idle especially now they they all have start/stop and the engines are shutting down at stop lights.

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Sound at 60 or 70 mph I think matters note than idle. How often do cars idle especially now they they all have start/stop and the engines are shutting down at stop lights.

Everything in this class is virtually unhearable at speed. Even my old CRV can do that. Road and wind noise are bigger concerns

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That is what I meant, cabin noise levels at highway speeds.  Engine noise isn't a problem in most of these cars because the V8 cars don't really need to rev much past 2500 rpm for every day driving, and even a lot of these turbo sixes make a lot of low end torque.

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NA 3.6L V6 spunds a little odd given that Cadillac seems to be willing to align itself with the market trends... Maybe it will be the plug-in hybrid model's ICE?...

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Rumor is the new E-class has a quad-turbo inline six that in gas form makes 367to 435 hp and as much as 553 lb-ft, and in diesel form makes 313 to 400 hp and 516 lb-ft to 627 lb-ft of torque.   They are bringing a pretty big gun to the fight, Cadillac may want to rethink that 3.6 V6 and just make the 400 hp engine standard.

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Rumor is the new E-class has a quad-turbo inline six that in gas form makes 367to 435 hp and as much as 553 lb-ft, and in diesel form makes 313 to 400 hp and 516 lb-ft to 627 lb-ft of torque.   They are bringing a pretty big gun to the fight, Cadillac may want to rethink that 3.6 V6 and just make the 400 hp engine standard.

 

I was wondering how long would it take for this information to get parroted on a Cadillac thread.

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On thinking a little bit about N/A 3.6L and giving Cadillac a benefit of doubt, may be that engine will be installed for hybrid powertrain. As it seems nonsensical to have a turbo motor doing the work for hybrid cars.

 

Regardless, I do not think the N/A should be the engine of choice for non-hybrid applications when almost all competitors are force induced at that power level. There should be two tunes of the 3.0T to simplify the costs.

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On thinking a little bit about N/A 3.6L and giving Cadillac a benefit of doubt, may be that engine will be installed for hybrid powertrain. As it seems nonsensical to have a turbo motor doing the work for hybrid cars.

 

Regardless, I do not think the N/A should be the engine of choice for non-hybrid applications when almost all competitors are force induced at that power level. There should be two tunes of the 3.0T to simplify the costs.

 

In the higher classes they are taking more and more high HP Turbo engines and combining them with electric drive or assist. Uber high MPG is not always a must have but if they can take a car improve the MPG but add to the performance these companies are going to do it.

 

Not all Hybrids are the same or out for the same mission.

 

The 3.6 I expect will be for Limo's and hearses. At least it makes more sense than the 2.5 NA in the CTS.

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Remember, these are Cadillac wide engines, not just CT6 engines.  This 3.6 will go into everything at Cadillac that currently runs a 3.6 N/A.  So you're looking at 3.6 N/A horsepower figures for the next CTS, ATS, SRX, and XTS refreshes (and I do expect XTS to survive a bit longer for fleet use).

 

We also don't have torque curves yet... and I will be asking my contact at Cadillac for them... but apparently they've tuned this engine for better off the line punch. Yes you still have to rev the engine to get to the peak, but that's true of all DOHC N/A 6es (see what you've done SMK? we could have had torquey pushrods in there... but noooo.)

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Regardless, I do not think the N/A should be the engine of choice for non-hybrid applications when almost all competitors are force induced at that power level. There should be two tunes of the 3.0T to simplify the costs.

 

You channeling a bit of SMK there?  :AH-HA: ...   3 of the competitors have Forced Induction... the rest are Naturally Aspirated.

 

"At these power levels"

Jaguar, BMW, and Audi have forced induction.

 

Infiniti, Lexus, Acura, M-B, Hyundai Genesis, Kia K900, 300C V6... and if you want to be nice and include Lincoln are all naturally aspirated.

 

The key is the "at these power levels".  If you want more power, you need to go either to a V8 or a Turbo-6... which Cadillac will be offering as well.  It should be noted that a number of these competitors offer  less powerful base engines...  So if Cadillac is offering this 3.6 as the base engine, it will instantly have a an advantage.

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