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Herb Becker's new Land Speed motor pics... 3rd time's a charm??

Discussion in 'Norton Commando Motorcycles (Classic)' started by Eldo, Apr 20, 2019.

  1. Eldo

    Eldo

    Joined:
    Mar 19, 2015
    Cylinders, Sleeved with LA Sleeve FL80 sleeves, then bored to 81mm.[​IMG]

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    "BSA style" lifters.
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    Lifters extended to maintain stability in lifter block with high lift cam (.480" lift)
    [​IMG]
     
    Last edited: Apr 20, 2019
  2. Eldo

    Eldo

    Joined:
    Mar 19, 2015
    Herb Becker 1 pc pre-hardened 4340 steel crank. 73mm stroke, and custom pistons from JS Motorsports. Carrillo rods. Notice the ring lands moved down to accomodate deeper valve pockets. [​IMG]

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    Material removed from under piston to lighten up.
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    Last edited: Apr 20, 2019
    MichaelB likes this.
  3. Eldo

    Eldo

    Joined:
    Mar 19, 2015
    44mm intake, 38mm exhaust valves, 7mm stems, JS Motorsport BeeHive springs. [​IMG]

    Modified "Big Block" Chevy pushrods.
    [​IMG]
     
    Last edited: Apr 20, 2019
    Atlas Commando likes this.
  4. Eldo

    Eldo

    Joined:
    Mar 19, 2015
    JS Motorsport "Stage 4" cam, .480" lift. [​IMG]
     
    Last edited: Apr 20, 2019
  5. Eldo

    Eldo

    Joined:
    Mar 19, 2015
    Steel "girdle" bolted to drive-side crank case.[​IMG]

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    Last edited: Apr 20, 2019
  6. lcrken

    lcrken VIP MEMBER

    Joined:
    Mar 15, 2009
    Great pictures. Are those carbon fiber push rods? The only Commando engine (872 cc road racer) I've seen use them didn't end too well. One of the push rods disintegrated.

    These are the remaining three. I notice that yours are larger diameter, so should be stiffer.

    IMG_2624 1200.jpg

    Ken
     
  7. Eldo

    Eldo

    Joined:
    Mar 19, 2015
    Ported and flowed head; 38mm intake, modified intake face plate[​IMG]

    re-angled valve guides (+2ยบ)[​IMG]

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    Shortened valve guides
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    Herb Becker intake runner. [​IMG]
     
    Last edited: Apr 20, 2019
  8. Eldo

    Eldo

    Joined:
    Mar 19, 2015
    Big Block Chevy pushrods.
     
  9. lcrken

    lcrken VIP MEMBER

    Joined:
    Mar 15, 2009
    Which carbs do you plan to run on it this year? I think you mentioned previously that you had 38, 40, and 44 mm Mikunis to choose from. The size of those manifolds look like you might be running the big guns.

    Ken
     
    Torontonian likes this.
  10. snail

    snail

    Joined:
    Dec 24, 2014
    Are the lifter extensions bronze welded or silver soldered? Want to do this myself but don't want to upset the stellite bond.
     
  11. Eldo

    Eldo

    Joined:
    Mar 19, 2015
    We ran the 44m Mikunis on the 920cc motor last year; we found they worked great in the 1/4 mile at the drag strip, but we feel they were a bit big for a 3 mile run on the salt (not enough velocity for sustained 7500rpm), so we will be trying the 40mm carbs on both the 920 and the 750, with 38mm carbs in reserve to try as well, in hopes of increasing the velocity (and rpm.)
     
  12. Eldo

    Eldo

    Joined:
    Mar 19, 2015
    Silver soldered.
     
    snail likes this.
  13. Atlas Commando

    Atlas Commando VIP MEMBER

    Joined:
    Feb 27, 2018
    I hope you have a fun and fruitful trip this year!
     
  14. MichaelB

    MichaelB VIP MEMBER

    Joined:
    Jan 14, 2004
     
  15. Bernhard

    Bernhard

    Joined:
    Apr 20, 2011
    Re; "Excuse the novice question here, how is that flywheel secured?"
    T slot- you can see it if you magnify the pic.
     
  16. MichaelB

    MichaelB VIP MEMBER

    Joined:
    Jan 14, 2004
    How is it secured to the T -slot?
     
  17. Bernhard

    Bernhard

    Joined:
    Apr 20, 2011
    Is there not a hole on the bottom of one flywheel weight that appears to have some sort of Allen screw bold going through it?
     

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