Dissection of the LS Engine

Discussion in 'Chevy' started by Toobuilder, Sep 28, 2012.

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  1. Sep 28, 2012 #1

    Toobuilder

    Toobuilder

    Toobuilder

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    Finally found a mule to play with! I've torn it down enough to establish overall condition and have a look at the architecture. With an eye towards a direct drive and inverted operation, I've been looking at some of the detail parts and areas to save weight by modification or outright omission. I'm quite impressed with the engine, but there are plenty of opportunities to save shed some fat.

    I'll post some detailed pictures before too long with some examples of weight savings ideas, but this thread hopefully will grow into an exposé on the possibilities of the LS series.

    Also, this is my first post after changing my whole home IT system (now I'm smartphone based), so it's going to take me a while to figure out how to upload pics and stuff, so bear with me.
     
  2. Sep 28, 2012 #2

    revkev6

    revkev6

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    what LS engine did you get!
     
  3. Sep 28, 2012 #3

    Toobuilder

    Toobuilder

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    It's just a little 4.8 Vortec.
     
  4. Sep 28, 2012 #4

    revkev6

    revkev6

    revkev6

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    ohhh it's so cute, it's just a baby!

    gotta pick up one of the 7 liter jobbies :gig:
     
  5. Sep 28, 2012 #5

    Toobuilder

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    Once I have my way with the 4.8, I'll look to build a big one. The baby will demonstrate most of all the mechanical integration problems, so well see where that leads me.
     
  6. Sep 29, 2012 #6

    RJW

    RJW

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    Great! I can’t wait to see pics and hear your take on the motor. There is a lot of questionable info floating around. It will be nice to get clear, objective, and relevant comments. I really like the inverted DD configuration.

    I really must start collecting these motors. My usual sources for junk motors seem to have dried up. I guess I haven’t been doing enough crappy car work lately.

    Rob
     
  7. Sep 30, 2012 #7

    Toobuilder

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    Yes Rob, you need to get one. They're pretty neat.
     
  8. Oct 21, 2012 #8

    rv6ejguy

    rv6ejguy

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    Anyone flying an LS who can comment on successes, issues, problems, fuel flow vs. power setting etc?
     
  9. Oct 21, 2012 #9

    Toobuilder

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    Are you speaking of an essentially stock "crate" engine (EFI, computer, etc)? If so, that might just lead down the typical path with auto conversions. As I dig more into this engine, there appears to be plenty of room for minor tweaks that should collectively provide real gains in cooling, oiling, and weight. In short, there are no doubt some successes with factory built engines, but I'm thinking the engine should be built from the ground up as a flying engine. There are still plenty off off the shelf (or nearly so) parts available for high output (aviation) use, but the dream of a turn key engine from the local Chevy dealer is a little optimistic- JMHO
     
  10. Oct 21, 2012 #10

    Toobuilder

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    So as a quick update, I am just about finished with a prop adapter for the end of the crank. As soon as I can get the pictures uploaded, I'll provide a more interesting discussion.
     
  11. Oct 22, 2012 #11

    Monty

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    I await progress with bated breath.
     
  12. Oct 22, 2012 #12

    rv6ejguy

    rv6ejguy

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    Really, I was interested with people having flight experience with an LS in any shape or form.
     
  13. Oct 22, 2012 #13

    RJW

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    Yeah! Cool! Let’s see the pics no matter how crappy. The phase of development that you are in is (to me anyway) by far the most fun. I like shiny finished things but it’s a real blast tearing stuff apart to see how it works.

    Rob
     
  14. Oct 23, 2012 #14

    PaulS

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    So, this is going to be a direct drive?
     
  15. Oct 23, 2012 #15

    Toobuilder

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    Yes, that is the design objective.

    Also just became aware of a Tall deck modification which can be added to the stock blocks which takes the engine out to 500 ci. Not cheap, but with a 4.5 inch stroke, that thing would swing a big prop like a Lycoming!
     
  16. Oct 26, 2012 #16

    revkev6

    revkev6

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    what is the modification?? I've heard of aftermarket blocks that you can buy but not a modification like a spacer??
     
  17. Oct 26, 2012 #17

    Toobuilder

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  18. Oct 26, 2012 #18

    revkev6

    revkev6

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    wow, that thing is both awesome and really scary at the same time! it would make for an ideal torque monster on the low end! use the small truck heads and intake with that block and you would really have something for direct drive
     
  19. Oct 26, 2012 #19

    Toobuilder

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    I agree, lots of potential there for DD. I think it's only available as a fully completed short block (to your specs) for around $14k. Pricy, but it has all the premium internal parts available.
     
  20. Oct 26, 2012 #20

    Jay Kempf

    Jay Kempf

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    Big prop isn't mandatory. You can suck up a lot of HP and generate a lot of thrust with the equivalent multiblade with a lot of pitch. Seems that cheap big torque is suited to a direct drive 72" ish 3 blade with ground adjustable blades but fixed pitch in flight for most of the speed regime of a small plane. You might sacrifice a little acceleration from a stop but not much else unless you are looking for STOL capability.

    What target T and HP at what RPM are you shooting at?

    And one more question: is the front and rear of the 6 the same as the 8 so that it share's the same boltup capability for accessories and your new drive. Seems like it should be. That would be a coupe.
     

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