EcoTec3 4.3 vs Vortec 4.3 - Page 2

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Thread: EcoTec3 4.3 vs Vortec 4.3

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    6.0 Liter L76 V8 posaune's Avatar
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    Re: EcoTec3 4.3 vs Vortec 4.3

    Quote Originally Posted by big swede View Post
    That would be a perfect choice for that car. More compact, lighter, cheaper, and probably more torque than the 3.6.
    How about they cut off two more cylinders and make a Gen 5 based V4. I would love to see something like that.

    Side note…Motus Motorcycles did do something like this. They worked with Katech (the Corvette racing guys) to design a V4 based on the Gen 4 small block. Looks like a nice engine. They were trying to get direct injection on it but as for now the production version didn’t get it. 1.65L 160-185 HP on regular gas (87 Octane).

    http://www.motusmotorcycles.com/kmv4.html
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    Re: EcoTec3 4.3 vs Vortec 4.3

    The question about weight is easy to answer. The LTI that is going into the Corvette is said to weigh 465 lbs, since the 4.3 V6 utlilizes the same materials for the block and heads you can expect it to be about 20 % lighter, so 465*.8 = approx 375 lbs. The physical size will be shorter byt about 20 % also. The 4.3 V6 will be both lighter than the 3.6 and have smaller dimensions for Height. Weight, and Length. The V6 would actually make a very good choice for an automotive powerplant, it is cheaper to manufacture, and very close in hp to the transversly mounted FWD/AWD versions of the LFX and will produce 50 to 60 ft lbs of torque more than the LFX at far lower RPM and with a much "flatter" Tq curve. It would be close to perfect for the new Impala.

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    Re: EcoTec3 4.3 vs Vortec 4.3

    Quote Originally Posted by BigAls87Z28 View Post
    No info about power or efficiency, but it's going to be used as the base motor for more than just a work truck variant. Like the Gen V vs Gen IV, there is very little carried over from one engine to the other. With the old 4.3 based on the Gen I 350cu engine, there is absolutely nothing shared outside of the displacement number.

    I'd say that 300hp would be an easy guess considering that the 3.6 makes over that with similar tech. I'd say that 295/310 rating with a 25mpg rating.
    I'd say 370 for the 5.3 and 410-420 for the 6.2. That's just my guess.
    I agree with your assessment, but EcoTec? Really? I was not part of that survey for the name change. Were you? I am hoping that EcoTec3 is the naming of the group of the 3 new engines and autcally not the name of each engine. EcoSkyActiveBluGreenBoostPriLeafVolTec/SS sounds better.
    I didn't go to math school, so I'm not going to do the math.

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    Re: EcoTec3 4.3 vs Vortec 4.3

    Cruising in 3 cylinder and lean burn mode, I bet we see 27 mpg hwy out of the 4.3.

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    Re: EcoTec3 4.3 vs Vortec 4.3

    Quote Originally Posted by BigAls87Z28 View Post
    I'd say that 300hp would be an easy guess considering that the 3.6 makes over that with similar tech. I'd say that 295/310 rating with a 25mpg rating.
    I'd say 370 for the 5.3 and 410-420 for the 6.2. That's just my guess.
    I think you are slightly low on the 6.2 as far as power goes....if it matches the 370 on the 5.3 per liter....you would get closer to 430.

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    Re: EcoTec3 4.3 vs Vortec 4.3

    Quote Originally Posted by hydrogen View Post
    Cruising in 3 cylinder and lean burn mode, I bet we see 27 mpg hwy out of the 4.3.
    The both the V8 and V6 act as V4s when the fuel management is activated.


    Quote Originally Posted by Press Release
    The system uses oil pressure, controlled by the powertrain control module, to deactivate the lifters on selected cylinders, closing the valves for those cylinders. It deactivates four of the cylinders on the V-8 engines and two cylinders on the V-6 under light load conditions operating the engines as a V-4 and seamlessly reactivates the cylinders when the driver demands greater power. The transition takes less than 20 milliseconds and is virtually imperceptible.
    http://media.gm.com/media/us/en/gm/n...3-engines.html
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    Re: EcoTec3 4.3 vs Vortec 4.3

    Now, which engine will cost the least to make? New 4.3 V6, Current 3.6 V6, 2.0T, 2.5L?


    Question #2. What are the differences between these V8s and the new LT1? Aren't they both considered Gen 5 and all aluminum, DI?
    Last edited by posaune; 12-14-2012 at 09:37 AM.
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    Re: EcoTec3 4.3 vs Vortec 4.3

    Quote Originally Posted by Ppmammp View Post
    The question about weight is easy to answer. The LTI that is going into the Corvette is said to weigh 465 lbs, since the 4.3 V6 utlilizes the same materials for the block and heads you can expect it to be about 20 % lighter, so 465*.8 = approx 375 lbs. The physical size will be shorter byt about 20 % also. The 4.3 V6 will be both lighter than the 3.6 and have smaller dimensions for Height. Weight, and Length. The V6 would actually make a very good choice for an automotive powerplant, it is cheaper to manufacture, and very close in hp to the transversly mounted FWD/AWD versions of the LFX and will produce 50 to 60 ft lbs of torque more than the LFX at far lower RPM and with a much "flatter" Tq curve. It would be close to perfect for the new Impala.
    Assuming it has great NVH characteristics, I'd also like to explore it's use in passenger cars.
    Pony Car: an affordable, compact, highly styled car with a sporty or performance-oriented image and an available V8.

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    Re: EcoTec3 4.3 vs Vortec 4.3

    Quote Originally Posted by darryl32v View Post
    Correct me if Im wrong, but until the GEN 5 motor the 4.3 did not get any of the previous GEN 3 or 4 updates. I believe you are going to see a significant gain in MPG with this motor not to mention hp and trq. The engine mounts the 4.3L use are now common with the v8's. So in theory the knew 4.3L should be able to bolt into a gen 4 v8 engine bay.
    In theory???
    Something 80% of the size of something else that already fits doesn't rely on theory, but rather empirical evidence or just look at. The engine and the available space! NOT rocket science!

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    Re: EcoTec3 4.3 vs Vortec 4.3

    It's too early to speculate on passenger car use for the 4.3 ... Heck, GM hasn't even really rolled out the 2.5L 4 EcoTec across the board yet.

    We'll see the 4.3 migrated to the SUVs in 2015 MY. As capacity opens up, maybe the 2016 MY, for one or two car models.

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    Re: EcoTec3 4.3 vs Vortec 4.3

    My guess would be 300hp, 320 lb/ft. torque and about 24 highway in a RWD 1500.
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    Re: EcoTec3 4.3 vs Vortec 4.3

    Quote Originally Posted by hydrogen View Post
    Cruising in 3 cylinder and lean burn mode, I bet we see 27 mpg hwy out of the 4.3.
    All the new lt1 based engine will go to 4 cylinders, that includes the 4.3

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    Re: EcoTec3 4.3 vs Vortec 4.3

    The 4.3, 5.3 and 6.2 would all be great engines for alpha coupes, sedans and SUVs. And if you can get 25-27 mpg with a 5,000 pound truck, you should be able to get 30-35 mpg in a 3500 lb alpha sedan.
    Comeon GM, put it in HIGH GEAR!!!!!!!!

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    Re: EcoTec3 4.3 vs Vortec 4.3

    4.3L - 280 hp/290ft.-lbs. of tq.

    5.3L - 350hp/360ft.-lbs. of tq.

    6.2L - 425hp/425ft.-lbs. of tq. <--- Straight out of the Corvette baby!

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    Re: EcoTec3 4.3 vs Vortec 4.3

    Quote Originally Posted by tbirderic View Post
    My guess would be 300hp, 320 lb/ft. torque and about 24 highway in a RWD 1500.
    You are close with those numbers, but i will add a little more , like 315hp and say the same 320lb/ft, but 21-22 city and 26-28 highway.

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