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ME Motor Testing In Plain Sight?

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  • ME Motor Testing In Plain Sight?

    Has the ME’s motor been testing in plain sight? This is an older, and an interesting thesis, but of course we right now do now know its validity.

    Originally posted by GearPatrol
    The Next Generation Mid-Engined Corvette Is Being Tested Right in Front of Your Face On National Television

    FEBRUARY 1, 2018 CARS By BRYAN CAMPBELL Photo by BRYAN CAMPBELL


    News that the next-generation (C8) Corvette is going to have an engine-mounted behind the driver isn’t anything new. GM hasn’t made any official statements to either confirm or deny the long-standing rumors, but it’s pretty much the industry’s worst kept secret. Despite that, GM is still going to great lengths to keep it a secret — except for the fact that it’s putting in valuable test miles with the engine on national television. And if you caught any of last weekend’s Rolex 24 Hours of Daytona, you saw it absolutely dominate the competition in the back of the DPi Cadillac race cars.

    It needs to be said that this is speculation, but it’s well within realm of possibility. Here’s why.



    It wouldn’t be entirely unheard of for a car manufacturer to use countless, punishing racing miles to learn, build and reinforce an engine or technology that is intended to eventually see duty in a mass-produced passenger car. The most recent and most high-profile example of this practice is the 2017 Ford GT. Ford used the last generation Daytona prototype cars they were racing at Daytona and in the IMSAchampionship, up until 2017, to fine tune the Ford GT’s turbo V6 engine. That R&D wasn’t only for racing at Le Mans but was also meant to build up long-term endurance and reliability for the now legendary supercar. GM, it seems, is taking a page out of Ford’s book and doing the same for the Corvette, only using the Cadillac DPi — currently the only mid-engined vehicle GM officially has a name on — as the host.

    Here’s where I connect the dots, True Detective-style. The best clues are engineering details. The mill in the back of the Cadillac DPi is based on the engine internally code-named LT4, (the same 6.2-liter V8 you can find in the Cadillac CTS-V sport sedan and Escalade). In this year’s DPi race car, however, the engine is shrunk to 5.5-liter V8 form, which was achieved by de-stroking the engine (done to increase efficiency and manage power output). Otherwise, it’s mechanically identical to last year’s 6.2-liter V8.

    Late last year, 3D computer models of an LT1 engine (the current Corvette engine) built for a mid-engine setup leaked and were inadvertently confirmed by GM to be official CAD designs. On the surface, there isn’t much to tell apart the LT1 from the LT4 engine. What you can’t actually see, per se, is larger compression ratio and ‘hotter cams‘ in the LT4, which give it a higher redline. That means what looks like the current Corvette’s LT1 in the leaked images may actually be an LT4 — the engine Cadillac races today.


    Speaking after this year’s 24-hour race, Product Marketing Manager of V-Series and Cadillac Racing, Matt Russell, could only confirm “the supposition that we would test on the track and then translate what we learn to the street is alive and well.” But when pressed about any mid-engine road cars coming from GM, Russell gave the industry-standard stonewall comment: he couldn’t speculate on GM’s broader plans and future products.

    As for testing the engine in the back of the Cadillac DPi endurance racers, over the course of the 24 Hours of Daytona the four cars running Cadillac engines racked up a total of 8722.42 high-stress test miles. Now GM will take all of that data, figure out what needs reinforcing and how better to cool the engine. That’ll be necessary because if the leaked CAD images are to be believed, at least one trim level of the next Corvette will be turbocharged. And turbos necessitate incredible amounts of cooling.

    Better still, the engines in race trim are restricted to 600 horsepower to stay in accordance with IMSA rules. And since the 2019 Corvette ZR1 currently manages 755 horsepower at the rear wheels, there’s no doubt GM will coax out a few more ponies with the added balance of the mid-engine architecture.

    The only possible disappointment from this uncertain certainty, if you will, is that Cadillac is putting in all the leg work for the Corvette and getting stiffed on the highbrow supercar it deserves. A 700-plus horsepower mid-engined American supercar with the interior of a CTS-V rather than a low-rent Corvette would be Ferrari-baiting. But until it’s made official either this year or next, there’s no way to be absolutely certain about all the connected dots on my C8 Corvette Crazy Wall, so I’ll just go empty my mason jars, shave my beard and get back to work.

    https://gearpatrol.com/2018/02/01/ne...sion-cadillac/
    Excited owners of a 2015 Z06. Lifetime, annual contributors, and 20 year members of NCM. Our 2020 ME C8 Corvette is next.

  • #2
    There is a supporting document for the ME’s motor being a 5.5L. That is the October, 2017 IHS Markit Engine Forcecast. It states that one of the mid engine’s motors would be 5.5L; however, it is listed as a 32V motor, so perhaps that is the motor coming for a later, high performance mid engine version.
    Last edited by John; 12-26-2018, 04:53 PM.
    Excited owners of a 2015 Z06. Lifetime, annual contributors, and 20 year members of NCM. Our 2020 ME C8 Corvette is next.

    Comment


    • #3
      Click image for larger version  Name:	Action-Express-AXR-Corvette-Daytona-Prototype-Rolex-24-Hours-Daytona-Saturday-02-1050x709.jpg Views:	1 Size:	291.1 KB ID:	20680 The Corvette Daytona Prototypes, which have had a winning track record, also have been running a mid-engine 5.5 L small block since 2012 (and maybe earlier than 2012)).

      Between the Corvette DPs and the Caddys, there have been quite a few winning race miles placed on 5.5 L Chevy small blocks.

      Click image for larger version  Name:	092314_25.jpg Views:	1 Size:	112.8 KB ID:	20679
      Last edited by Mobius; 12-27-2018, 06:46 AM. Reason: added pics
      Current Vettes:
      '68 Lemans Blue 327/350 Convertible
      '91 Turquoise Convertible w/hardtop
      '14 Lime Rock Green 2LT Convertible, Black Top, Kalahari, 7-Speed, Performance Exhaust - Ordered on 4-1-2014, 2000 Status on 4-10-2014, TPW 5-12-2014, Built on 5-16-2014, Picked-up at dealership on 5-30-2014
      "Delta t = 23"

      Comment


      • #4
        Thank you Mobius. That would be one tested motor if we get it.

        Comment


        • #5
          Sounds like the engine under discussion still has pushrods and 16 valves.

          Comment


          • #6
            I don't know if this has been covered in another thread, but with the CT6 being discontinued mid-19 is it possible the V motor will make its way into the ME?

            Comment


            • #7
              JustOneMore, that is very possible IMO. GM spent an unbelievable amount developing that motor. A friend of mine was one of a moderate sized team that spent two years developing it.* Even within its the one year life span for the Cadillac CT6, its sales were below pre-development projections. However, might it later be found in the 2021 Escala Cadillac?

              Also and probably way more importantly, in the Oct. 2017 IHS Markit Engine Forecast, it was specifically listed that a mid engine Corvette would have a 4.2L, 32V, DOHC, V8 (listed at 8,000 units/year).

              Will the 550 HP, 627 TQ version of that motor be part of a specific ME model. Or wil the 500 HP version become the entry motor in year two (most originally doubted it will be the year one motor), but here’s a thought based on no factual inside info, if there is a long delay in the ME, might it become the base motor from the beginning. We sure do not know.


              * As one example of how tightlipped GM Corvette team members are, my good friend who worked daily on that motor, never mentioned it to me once during our conversations, never even hinted it existed. The only way I learned that he worked on it at all, was the day it was publicly revealed at the New York Auto Show last April, with his name on a “Built By X Y plaque,” he emailed me the following cryptic one sentence.

              Now you know what I have been doing the last two years.” With these pictures.

              Click image for larger version

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              Last edited by John; 01-02-2019, 07:51 PM.
              Excited owners of a 2015 Z06. Lifetime, annual contributors, and 20 year members of NCM. Our 2020 ME C8 Corvette is next.

              Comment


              • #8
                Originally posted by John View Post

                Will the 550 HP, 627 TQ version of that motor be part of a specific ME model. Or wil the 500 HP version become the entry motor in year two (most originally doubted it will be the year one motor), but here’s a thought based on no factual inside info, if there is a long delay in the ME, might it become the base motor from the beginning. We sure do not know.


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                I hope not. They can throw that one in the GT. I'd like the base price to stay as low as possible. Alot of people probably won't be able to get a C8 year one. The Chevy dealerships around here suck bad. I've only had one vette and it was used. I got my camaro new in 2017 but have zero clout there or with any national dealer. I'll be having to stay pretty near base (i'm guessing) $75kish so I'll be way down the list of national guys. I'll put a grand down once I'm able to somewhere(nationally), but I'm sure they'll take care of their repeat buyers first.
                Last edited by TOMDOM69; 01-02-2019, 10:36 PM.

                Comment


                • #9
                  My best prediction remains that the first year entry ME will have an LT2 motor (the typical 16V, OHV, GM V8), an LT1 derived but enhanced motor, estimated around 500 HP.

                  Again, we have ideas, but incredibly few facts at this time.
                  Excited owners of a 2015 Z06. Lifetime, annual contributors, and 20 year members of NCM. Our 2020 ME C8 Corvette is next.

                  Comment

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