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Interesting note in the MotorTrend article about this engine:
"Cadillac claims the 2019 CT6 V-Sport’s engine is both smaller on the outside and lighter than the supercharged LT4 and LT5 Small Block V-8s, weighing in at a claimed 529 pounds."
The 4.2L TT V8 is said to be exclusive to Cadillac but that doesn't mean the rumored 4.4L TT and the 5.5L TT are not bound for the ME Corvette Zora. The engine family is not exclusive but that 4.2L engine size is for Caddy and it comes in a regular 500 hp version along with the 550 hp V-Sport version also.
Last edited by rlhmarines; 03-21-2018 at 01:56 PM.
The Caddy also has active rear wheel steering. That would make it a certain(IMO) that the ME Corvette will have active rear wheel steering.
I don't think this engine will be in the ME Corvette(if the published CAD drawings are correct) as the CAD drawings show a normal TT layout, and not a Hot V design.
I bet that this Hot V TT engine will drop right into a front engine C8.
Back a few years ago, GM designed and tooled up a 4.5L TT Hot V diesel 72 degree V8 that would fit in the same box as a LS engine. I posted back then that it wouldn't take much to make that engine into a gasoline Hot V TT engine for the Corvette.
The MT arcles says 1,500, or so, engines annually for the caddy. I really doubt that GM that GM went to that expense for 1,500 engines annually. BUT, if it's a base engine for a FE C8, that would add another 20,000 to the mix. Oh, and the MT article said two versions, 500 HP and 550 HP. That would make sense for a base FE C8(500HP) and a GS at 550 HP.
When one reads the Cadillac press release, it does not say it is “exclusive” to the Cadillac. It does say it is “all new”to the Cadillac. That is a big difference!
Second, even if it were exclusive to the Cadillac, that could mean absolutely nothing more than its P/N is different for the Cadillac (yes, it has the word “Cadillac imprinted in its top lid). Could mean that the headers are diff, that the ECU would be calibrated with just one bit or byte different, or something else tiny, with any one of these things resulting in it being Cadillac unique.
It absolutely does not mean that this motor, albeit with at least a different top lid and perhaps some more little things, will not be the 99% identical to what is going into the 2020 Corvette ME,i.e., if one reads the Markit Engine Forecast, it refers to a a 4.2L, 32V, DOHC, TT, motor for the 2020 ME.
“It’s interesting to note that Cadillac claims the 2019 CT6 V-Sport’s engine is both smaller on the outside and lighter than the supercharged LT4 and LT5 Small Block V-8s, weighing in at a claimed 529 pounds. S”
A couple of thoughts.
2015 LT4 is compact sure, but what about the uneven cylinder cooling and reduced power modes? In hindsight, give me the larger 2017 version of the motor.
As others have mentioned 100hp down so irrelevant whether smaller.
It runs 20 psi... if it runs 50% fewer miles than an LT4 then it's a bust even if it made the same power.
Does a smaller DOHC 4.2 turbo sound as good as a 6.2 supercharged OHV? Caddy made a stroker so no flat plane crank and no 9000 rpm. Answer: clearly no.
Throttle response compared to belt driven car?
Overall, this is catch up to a 2010 engine made by BMW, the S63B44O0. Doesn't everyone have a DOHC V8 turbo with more power nowadays?
Another edit: for those that want to crank up the boost, not so fast. Pistons aren't forged and it's already running 20 psi. I wouldn't... Far more room in an LT4 to add boost.
The Caddy also has active rear wheel steering. That would make it a certain(IMO) that the ME Corvette will have active rear wheel steering.
I don't think this engine will be in the ME Corvette(if the published CAD drawings are correct) as the CAD drawings show a normal TT layout, and not a Hot V design.
I bet that this Hot V TT engine will drop right into a front engine C8.
Back a few years ago, GM designed and tooled up a 4.5L TT Hot V diesel 72 degree V8 that would fit in the same box as a LS engine. I posted back then that it wouldn't take much to make that engine into a gasoline Hot V TT engine for the Corvette.
The MT arcles says 1,500, or so, engines annually for the caddy. I really doubt that GM that GM went to that expense for 1,500 engines annually. BUT, if it's a base engine for a FE C8, that would add another 20,000 to the mix. Oh, and the MT article said two versions, 500 HP and 550 HP. That would make sense for a base FE C8(500HP) and a GS at 550 HP.
Awesome. Turbo cars are so easy to turn up, don't even need to skin a knuckle to make another 50hp with adjusting the waste-gates and fuel. I'd be all for that in the ME C8!
A 500 HP for the race car Validation (Ford's ecoboost V6)! But, the OHV has a lower COG and using it with the C8 frame would really ****-off the competition.
SWEET (GM liked the Bimmer motor too)!
Originally Posted by 3 Z06ZR1
Said a man kicking tires since 2002!
"Amazingly, the two Biggest Babies on my WWW Forum are from Salem." A Small World after all!
Last edited by johnglenntwo; 03-21-2018 at 07:56 PM.
I don't know, looks like a german engine clone to me. And by the pictures, just as overcomplicated, hard to service and fairly likely as unreliable as the engine its trying to emulate. Don't get me wrong, there is certianly and place for it and Cadillac is the most logical destination in GMs line up but I personally don't think its great fit for the Corvette.
I don't know, looks like a german engine clone to me. And by the pictures, just as overcomplicated, hard to service and fairly likely as unreliable as the engine its trying to emulate. Don't get me wrong, there is certianly and place for it and Cadillac is the most logical destination in GMs line up but I personally don't think its great fit for the Corvette.
Agreed. This seems like the sort of thing people in Caddy want, but really don't need, and buyers don' want. Every time GM tried cars like this, they don't sell. The ATS and V, flop. The CT6, flop. The XTS is the only sedan that sells, but not in v sport trim.
Caddy needs to stop pretending it' a MB and BMW co.petitor and recognize it's customer base and their desires.
An engine like this would certainly reduce the appeal of the Corvette. Part of the reason the Corvette is so good is its bulletproof reliability, due to its long history with the small block. The change to a new Northstar type of engine is not a good thing for reliability or Corvette in general.
personally I wanna see Cadillac start making BIG cars again like they were known for in the 70's. Sadly though, I don't want to see them fail at it. I feel like theres enough competition in this sector, and not just from the Germans. The damn koreans make an awesome luxury sedan even tho it hurts me to say it.
Interesting note in the MotorTrend article about this engine:
"Cadillac claims the 2019 CT6 V-Sport’s engine is both smaller on the outside and lighter than the supercharged LT4 and LT5 Small Block V-8s, weighing in at a claimed 529 pounds."
Impressive stuff!
I wonder what the actual numbers are, as I am pretty sure the LT4 is right around 530 lbs as well. I have a picture of a mostly dressed one on a scale showing just over 500 lbs, so fully dressed about 530 lbs sounds right.
At the New York auto show cadillacs head of the division JDN said that the new twin turbo v8 will be solely a Cadillac engine and will not be in the next generation corvette.
Doesn't sound like the corvette is getting the twin turbo Cadillac 4.2 liter v8 (as per JDN)
03-21-2018, 12:39 PM
)! But, the OHV has a lower COG and using it with the C8 frame would really ****-off the competition.
