Small V8

Discussion in 'A Work In Progress' started by stevehuckss396, Jun 7, 2010.

  1. Jun 7, 2010 #1

    stevehuckss396

    stevehuckss396

    stevehuckss396

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    Hello all!

    I have hit a creative wall with the straight 8 so I have decided to put it aside and work on something else. This new project is something I have wanted to do for some time. I finally have the plans in good shape, well good enough to start. I like the size of the peewee V4 so i borrowed the 5/8 bore and stroke and will try to build a V8.

    [​IMG]


    This V8 will be small by most standards. 5/8 bore and stroke. It will have splash oil system and have a coolant system. Unlike Peewee, It will have a more conventional head setup with valve covers. The block will be about 5 inches long with heads at 4.5 inches. I will shoot for 6:1 compression. The cam will be about the same as the peewee as far as lift and duration. Seems like a doable size for smaller equipment.

    The down side is that I could only fit # 8 spark plugs in this one so I'll have to make my own. Also the distributor cap sold by Roy is too big so I will have to make my own. The ignition will need to be toned down to control spark.

    It will be built using manual equipment and CNC equipment. I know that's a turn off for some but I didn't build a CNC mill so I could look at it across the garage. I'm hoping it will speed things along when making 16 rocker arms or 16 of something else.


    The block is made from a 3 X 3 X 5 block of aluminum.

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  2. Jun 7, 2010 #2

    T70MkIII

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    I'm really looking forward to this build, Steve, as I intend to build a small gas powered V8 once I have developed the necessary skills. I have learned a lot from your WIP threads so far, and I look forward to learning plenty more.

    What type of aluminium did you choose?
     
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  3. Jun 7, 2010 #3

    crankshafter

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    Hi Steve
    Nice beginnig on the V8. I'll be watching this build, for sure ;)
    I have missed the stright 8,but I'm sure you will be finnishing it when you comes down from the wall :big:

    CS
     
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  4. Jun 7, 2010 #4

    BenPeake

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    That is a monster of a project. Can't wait to see more pictures! Thanks for posting.
     
  5. Jun 7, 2010 #5

    deere_x475guy

    deere_x475guy

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    Looks like you have a good start on this Steve. Any plan to cast some of the parts?
     
  6. Jun 7, 2010 #6

    stevehuckss396

    stevehuckss396

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    I used 6061. 6061 is good for every part of a small engine. I might use some 7075 for the pistons but everything will be 6061.
     
  7. Jun 7, 2010 #7

    stevehuckss396

    stevehuckss396

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    I have made some motor mounts but have not put up pictures. I have to work out the ignition. I can make up my mind so i'll let it bake in my head for a while. I will make that thing run.
     
  8. Jun 7, 2010 #8

    stevehuckss396

    stevehuckss396

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    Not on this one.
     
  9. Jun 8, 2010 #9

    stevehuckss396

    stevehuckss396

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    Well we are off to a bad start. I screwed up the block so i'll have to have it welded up before i proceed.


    I thought that starting on the heads would take my mind off things. I worked on getting the blocks squared up and machining them to the correct shape.


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    While the heads were being worked on the CNC machine was chopping away at another piece of the puzzle. In the time it took to make 2 blanks for the heads, the CNC spit out the oil pan.

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    Here is where i'm at. Bummer about the block.

    [​IMG]
     
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  10. Jun 8, 2010 #10

    stevehuckss396

    stevehuckss396

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    First thing I did was mill the valve cover surface and create the pocket.

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    The holes are drilled on the bottom and a small water passage was milled in the surface.

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    The exhaust port surface is prepared but will need to be drilled to the port after the valve cages are installed.

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    I still need to do the bottom to create the combustion chamber and I also need to do the intake surface. Hopfully tomorrow! It's starting to look like a head.
     
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  11. Jun 8, 2010 #11

    zeeprogrammer

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    Apologies if this is a reminder of a boo-boo...but I don't understand what the boo-boo is. What needs to be welded up? The parts look awesome to me.
     
  12. Jun 8, 2010 #12

    stevehuckss396

    stevehuckss396

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    Made a bad cut on the block after the last photo was taken. Just need to touch up 2 surfaces and redrill one hole.
     
  13. Jun 8, 2010 #13

    kustomkb

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    Awesome work Steve!

    Looking forward to this one.

     
  14. Jun 8, 2010 #14

    kcmillin

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    Ok, you got my full attention Steve. This is turning out to be a pretty awesome engine.

    This is your design?

    Kel
     
  15. Jun 8, 2010 #15

    stevehuckss396

    stevehuckss396

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    Yes and no. I took some peewee and threw in a dash of nitro V8 and a tea spoon of big block chevy and walla.

    I liked the size of the Peewee but I had to stretch the block to make the heads work. I had some plans for a nitro V8 that had a pretty good head, so i reworked it (alot) to work on the block. Then everything else I drew for this engine specifically.
     
  16. Jun 8, 2010 #16

    Metal Mickey

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    Nice to see a new project start and especially one from you. I see Alibre features heavily and just the plans alone are a big project so well done.

    I understand the comment re CNC and I go hot and cold on a mill for the future. Could you annotate any picture if its done by CNC? Take it as a compliment about telling the difference! If you want any help re camshaft design and a cutting chart them let me know....I know this chap......oh.. forgot, its you!

    Looking forward to the build Steve, from design to running will be a great achievement.
     
  17. Jun 9, 2010 #17

    metalmad

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    lookig fantastic so far
    will be watching :)
     
  18. Jun 9, 2010 #18

    gbritnell

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    Hi Steve,
    It looks like you're making great progress on this build already. Are you going to be making an intake manifold similar to the one on your other engine? I silver soldered mine out of two pieces and it worked quite well.
    George
     
  19. Jun 9, 2010 #19

    stevehuckss396

    stevehuckss396

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    Got the intake surface done. If you are wondering why i put the 1/4 inch recess where the port goes. It helps me to locate when I cross drill to the port.

    Also made the combustion chamber cuts. Next move will be to drill and ream for the valve cages.


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    [​IMG]
     
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  20. Jun 9, 2010 #20

    stevehuckss396

    stevehuckss396

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    Going to try a one piece. If that fails . . . .. We'll talk.
     

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