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  • C8 Stingray LT2 vs LT1

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    Pictures thanks to GM from reveal.


    Great thanks to Car&Driver for providing us with a lot of details about how the LT2 is changed from the LT1. Fascinating article to me. There’s a reason why I have subscribed to Car and Driver for more than 30 years. For their pictures: https://www.caranddriver.com/news/a2...c8-lt2-engine/

    Originally posted by Car&Driver
    What You Need to Know about the C8 Corvette's LT2 V-8 Engine

    The newest version of the 6.2-liter small-block V-8 makes up to 495 horsepower and 470 lb-ft of torque and doesn't require routine engine-out service.

    By JOSH JACQUOT and DAVE VANDERWERP; JUL 19, 2019

    ChevroletChevy’s small-block V-8 has been a part of the Corvette legacy since 1955. It continues in the C8 as the LT2, making more power and more torque (495 horsepower and 470 pound feet with the performance exhaust) than the LT1 in the outgoing car. The LT2 expands the small-block’s capabilities with more-efficient intake and exhaust manifolds, a more-robust lubrication system, and a new camshaft. It uses the same bore and stroke, as well as the same forged crankshaft, rods, and 11.5:1-compression-ratio pistons, as the LT1 upon which it’s based.
    [IMG]https://hips.hearstapps.com/hmg-prod.s3.amazonaws.com/images/2020-chevrolet-corvette-lt2-engine-1563399415.jpg?resize=480:*[/IMG]
    Chevrolet

    All Stingrays will now get a dry-sump system to accommodate the chassis’s increased track capability, which includes sustained lateral acceleration beyond 1.00 g. Previously, dry-sump lubrication was only available as part of the C7 Stingray’s Z51 package. The system goes from one pump to three multistage scavenge pumps—one in the valley of the V and two in the crankcase. The oil reservoir is now mounted to the engine rather than being bolted into the engine bay separately as it was on the C7. A larger liquid-to-liquid oil cooler is capable of 25 percent more thermal rejection.

    As small-block chief engineer Jordan Lee explains, a side benefit for having this unconventional engine-mounted sump is an ease of assembly. Oil can now be added during the engine-build process rather than when the car is going down the assembly line. Thanks to the better scavenging, the engine is mounted an inch lower in the Corvette than before, with a much shallower oil pan. Lee says this also accounts for the reduction in total oil volume, which drops from 9.7 quarts in the LT1 in the C7 to 7.5 quarts of 0W40 in the C8's LT2.

    Lee also confirmed that the C8 doesn't require any routine engine-out services—often an expensive bugaboo with mid-engined cars—and that the spark plugs and other ignition components, along with the accessory belts that are tucked up next to the passenger compartment at the front of the engine, can be accessed with the engine in place. However, swapping out, say, the oil pump will require dropping the engine.

    The camshaft’s intake lobes remain the same as the LT1’s, but lift on the exhaust lobes is slightly increased. The LT2’s cam phasing, which alters intake and exhaust timing together, is about the same as before. The rest of the valvetrain is carryover from LT1 as is the LT2’s rev limiter, which remains at 6600 rpm.

    The additional output, which jumps from 455/460 hp and 460/465 lb-ft in the LT1 to 490/495 hp and 465/470 lb-ft in the LT2 (the higher figures are with the optional performance exhaust, which adds a second set of flapper valves) is due to the better breathing achieved with the engine in its new position behind the passenger cabin along with the other small tweaks mentioned above. Chief-engineer Lee also points out that small reductions in windage were achieved by the more precise oil scavenging. Before, oil up in the head would drip back down into the pan, slightly impeding the spinning crankshaft, but now that passage has been closed, and the oil is scavenged out of the V.

    With the engine behind the driver, engineers were less concerned with forward sightlines and free to make the LT2 taller than the LT1. A new intake manifold with equal-length runners is mounted so that the engine now breathes from the back of the car, further shortening the distance between the throttle body and intake valves, which improves flow.

    New stainless-steel exhaust manifolds also use equal-length runners, which collect using a race-car-like four-into-one design. The LT1’s cast manifolds had an intermediate step, going from four into two into one in the C7. An active exhaust changes the LT2’s sound in different drive modes, but isn’t a factor in peak output.
    Last edited by John; 07-22-2019, 11:55 PM.
    GBA Black; HTO Twilight/Tension interior; Z51 & Mag Ride; E60 lift; 5VM visible carbon fiber package; 5ZZ high wing; FA5 interior vis CF; ZZ3 engine appearance; 3LT; Q8T Spectra Gray Tridents; J6N Edge Red Calipers; SNG Edge Red Hashmarks; VQK Splash Guards; RCC Edge Red engine cover; VJR illuminated sill plates. Lifetime, annual contributors, and 23 year members of National Corvette Museum. Home is the beautiful Pacific Northwest.

  • #2
    So much for the claim that the only part carried forward was the door latch. Much of the LT2 has the same parts as the LT1.

    I suppose this also means that all engines of both Z51 and non Z51 will have the same 7.5 oil volume? Or will additional oil cooling in the Z51 increase its oil capacity? When you change oil, I suspect the old oil does not drain out of any oil coolers.

    Comment


    • #3
      I also read more than a few times ONLY one part of the C7 would be carried over . Curious what Chevrolet was referring to when this was said ?
      A thought if I might ...

      Comment


      • #4
        Good to see no engine out service required. Certainly makes the C8 more attractive and even more affordable to own compared to a ME Ferrari, Porsche or Lambo.

        Comment


        • #5
          Originally posted by Ssscooter66 View Post
          I also read more than a few times ONLY one part of the C7 would be carried over . Curious what Chevrolet was referring to when this was said ?
          Maybe since the dry sump is standard now it might lower the price on the Z51 option or at least keep it the same as the 19 C7 Z51 price. Fingers crossed.
          Black 3LT. Z51 mag ride front lift. black wheels and trim. .... Order status ...in my garage

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          • #6
            Maintenance and cost to maintain this ME Corvette as compared to a FE Corvette down the road has not been addressed in it's entirety. The engine may not need to be dropped to access certain items for repair but if an access panel behind the seats is inplace to replace certain items as maybe a water pump then the seats and carpeting need to be removed. Certainly more costly than the FE , for certain repairs. .

            Comment


            • #7
              thx for the article and link John ... lot's of stuff we "sort of" already knew, but nice to see it laid out in one piece. I can't imagine that the majority of us will have to contemplate an "engine out" service, but you never know. I haven't looked to see how the engine is mounted to the frame, but if it can be taken out from below, that is waay better than my old 308 which as to come out the top.

              Comment


              • #8
                Originally posted by John View Post
                Click image for larger version

Name:	E8403BB7-A653-456D-9120-87147E050246.jpeg
Views:	4416
Size:	2.47 MB
ID:	50039Click image for larger version

Name:	3D236AE9-AE2C-4E45-BC76-142D7EDE659D.jpeg
Views:	1841
Size:	793.3 KB
ID:	50040
                Pictures thanks to GM from reveal.


                Great thanks to Car&Driver for providing us with a lot of details about how the LT2 is changed from the LT1. Fascinating article to me. There’s a reason why I have subscribed to Car and Driver for more than 30 years. For their pictures: https://www.caranddriver.com/news/a2...c8-lt2-engine/
                At the C8 Seminar held at Key Chevrolet this past Sunday, Master Technician Paul Koerner indicated that you check the oil level with the engine running...

                Comment


                • #9
                  Originally posted by dolfanlon View Post

                  At the C8 Seminar held at Key Chevrolet this past Sunday, Master Technician Paul Koerner indicated that you check the oil level with the engine running...

                  Wow, what a change, so something needing to be repeated for us all. Thank you dolfanlon!


                  At the C8 Seminar held at Key Chevrolet this past Sunday, Master Technician Paul Koerner indicated that you check the oil level with the engine running...



                  GBA Black; HTO Twilight/Tension interior; Z51 & Mag Ride; E60 lift; 5VM visible carbon fiber package; 5ZZ high wing; FA5 interior vis CF; ZZ3 engine appearance; 3LT; Q8T Spectra Gray Tridents; J6N Edge Red Calipers; SNG Edge Red Hashmarks; VQK Splash Guards; RCC Edge Red engine cover; VJR illuminated sill plates. Lifetime, annual contributors, and 23 year members of National Corvette Museum. Home is the beautiful Pacific Northwest.

                  Comment


                  • #10
                    Originally posted by Ssscooter66 View Post
                    I also read more than a few times ONLY one part of the C7 would be carried over . Curious what Chevrolet was referring to when this was said ?
                    Must have been talkin about everything else besides the engine

                    Comment


                    • #11
                      Originally posted by bobbytinvab View Post
                      thx for the article and link John ... lot's of stuff we "sort of" already knew, but nice to see it laid out in one piece. I can't imagine that the majority of us will have to contemplate an "engine out" service, but you never know. I haven't looked to see how the engine is mounted to the frame, but if it can be taken out from below, that is waay better than my old 308 which as to come out the top.
                      Curious if you'll be able to just drop the entire rear subframe, after disconnecting some electrical bits of course. That could make it easier, especially if their is a cradle for it.

                      Comment


                      • #12
                        Of the $1,500 in speciality tools that every dealership needs to purchase to sell their first C8, about half of the price of them are specific cradles for the motor, the DCT, and similar.

                        For those concerned, we have seen how the oil filter is so accessible from the bottom without removing even a plastic panel. I was also told that with some easily bottom plastic panel removal, by putting the car on a lift, such things as spark plugs, coil wires and similar were reading accessible without dropping anything else. We all know that the plug are 100,000 miles scheduled before removal.

                        https://www.midenginecorvetteforum.c...ervicing-tools
                        Last edited by John; 07-23-2019, 10:00 AM.
                        GBA Black; HTO Twilight/Tension interior; Z51 & Mag Ride; E60 lift; 5VM visible carbon fiber package; 5ZZ high wing; FA5 interior vis CF; ZZ3 engine appearance; 3LT; Q8T Spectra Gray Tridents; J6N Edge Red Calipers; SNG Edge Red Hashmarks; VQK Splash Guards; RCC Edge Red engine cover; VJR illuminated sill plates. Lifetime, annual contributors, and 23 year members of National Corvette Museum. Home is the beautiful Pacific Northwest.

                        Comment


                        • #13
                          Originally posted by Milliwatt Rob View Post
                          So much for the claim that the only part carried forward was the door latch. Much of the LT2 has the same parts as the LT1.

                          I suppose this also means that all engines of both Z51 and non Z51 will have the same 7.5 oil volume? Or will additional oil cooling in the Z51 increase its oil capacity? When you change oil, I suspect the old oil does not drain out of any oil coolers.
                          As the engine is one, new, assembly, this is a new part. It is installed in the chassis as a package. The carryover part (s) are the two door latch mechanisms (technically two parts (but two of the same are used)). These are not the switches in the cabin. Theses are the latches inside the door.

                          Comment


                          • #14
                            jjsax, informative first post. Thank you.
                            GBA Black; HTO Twilight/Tension interior; Z51 & Mag Ride; E60 lift; 5VM visible carbon fiber package; 5ZZ high wing; FA5 interior vis CF; ZZ3 engine appearance; 3LT; Q8T Spectra Gray Tridents; J6N Edge Red Calipers; SNG Edge Red Hashmarks; VQK Splash Guards; RCC Edge Red engine cover; VJR illuminated sill plates. Lifetime, annual contributors, and 23 year members of National Corvette Museum. Home is the beautiful Pacific Northwest.

                            Comment


                            • #15
                              Originally posted by Ssscooter66 View Post
                              I also read more than a few times ONLY one part of the C7 would be carried over . Curious what Chevrolet was referring to when this was said ?
                              By implication , they are saying that the Blackwing Engine will most certainly be used in the C8, at some variant. They define "Engine" as a whole, specific and identical unit. The change of some internal components of the LT1, created a new part, in their jargon. By implication, changing internal parts in the Blackwing creates a new part, new unit, new whole. The declaration that the blacking will not be used in the C8 means not in that identical configuration, but with character changes that create different personality.

                              So the C8-Z06 gets the Blackwing as we would see it and will understand it, but not in their jargon and internal understanding.

                              This is kind of linear but seems to be the way it is working.
                              Last edited by SheepDog; 07-23-2019, 11:34 AM.

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